Engine BMW M43B16.

Engine characteristics M43B16

Production	Steyr Plant.
Engine brand	M43
Years of release	1993-2002
Cylinder block material	cast iron
Supply system	injector
A type	in line
Number of cylinders	4
Valves on cylinder	2
Piston stroke, mm	72
Cylinder diameter, mm	84
Compression ratio	9.7
Engine volume, ccmm	1596
Engine Power, L.S. / Ob. Min	102/5500
Torque, Nm / Ob.min	150/3900
Fuel	95
Environmental norms	Euro 2-3.
Engine weight, kg	-
Fuel consumption, l / 100 km (for 316i E36) - city - Rouss - Mixed.	11.0 5.9 7.7
Oil consumption, gr. / 1000 km	up to 1000.
Engine oil	0W-30 0W-40 5W-30 5W-40 10W-40 15W-50.
How much oil in the engine, l	4.0
Replacing the oil is carried out, km	7000-10000
Engine operating temperature, hail.	90-95
Engine resource, thousand km - According to the plant - on practice	- 300+
Tuning, L.S. - Potential - without loss of resource	150+ n.D.
The engine was installed

Reliability, problems and repair of the engine BMW M43B16

The next 1.6-liter BMW engine of the M43 family (it also includes it), which came to replace, was developed on the basis of 1.8-liter M43B18, which introduced a crankshaft with a reduced piston stroke to 72 mm (81 mm). Compared to the predecessor, the new power unit received lightweight crankshaft, other pistons with increased to 9.7 degree of compression, as well as rods with a length of 145 mm.
The head of the cylinder block, despite the former design with one camshaft, has undergone major changes. The timing belt drive gave way to a reliable chain, the replacement of which is required through ~ 300 thousand km. In addition, lightweight valves and new springs are applied, rockers of another design, valve gap hydraulic gaps remained. The diameter of the inlet valves is 42 mm, graduation 36 mm. Characteristics of the M43B16 camshaft: phase 244/244, lifting 10.6 / 10 mm.
The ignition system has changed, a collector of the DISA length is used to optimize the engine characteristics.
This motor was used on BMW vehicles with index 16i.
Since 2001, a new engine has been produced for 16-BMW -

When BMW in September 1990 showed the new "Troika" of the E36 series, the audience was shocked no less than in the time of controversial projects of Chris Bangla's chief designer. Everyone has become accustomed to angular E30 forms and humble E34 lines. Initially, buyers were careful, but soon the model began to enjoy in great demand in the markets of Europe and the United States.

Customers preferred, above all, sedan and coupe. The Europeans attracted the 3-door version of Compact, which de facto was a separate model. For the platform and most of the technical solutions were borrowed from the predecessor - BMW 3 E30.

Reputation

Worldwide BMW 3 E36 causes associations with young and gambling drivers who love to ride very quickly, which leads to numerous accidents. From the point of view of the buyer of a used car - it is quite important. Especially since in fact, a significant number of copies have been restored after an accident. BMW E36 has a rather complicated design. Therefore, his recovery is not an easy and expensive art.

It is very easy to run into a casually "renovated" coupe, which will rust, flow and exercise with loosely adjacent doors. The only opportunity to significantly increase the chance of buying a non-protected copy is to restrict the search for the Touring station. But only every Tenth E36 was produced in this body. Most of the proposals make up a sedan and a little less - a coupe. At the same time, the well-kept coupe may be twice as expensive than the sedan, especially when it comes to 318is.

The LED indicator shows how much time it remains to service. Red LED - punched an hour to visit the service.

Enemy at the threshold

Compared to Audi 80 B4, the Troika series E36 is prone to corrosion stronger, but not as much as Mercedes C-Class 1993. Rust bubbles on wings, thresholds, elements of the front and back of the body - the usual thing. Rzinets and the floor under the driver, where salty water accumulates under the carpet. Rust also attacks the battery mount (located in the trunk). After a time, the doors seals are deformed. This is especially painful for a coupe that has frameless side windows. Fortunately, all the details, even the smallest, can still be purchased in the original. True, a set of factory door seals on a sedan will cost at least 25,000 rubles.

Corrosion is the main enemy E36.

What is it so raging?

The E36 suspension is, of course, is not intended to overcome bumps. On domestic roads, it gives up pretty quickly, especially since most owners use the cheapest substitutes for repair. Fortunately, even high quality analogues are less than the original. So the front lower lever Lemforder is available for 5,000 rubles, and BMW is 9,500 rubles.

Problem number one - the backlash in the bushings of longitudinal levers from behind. It can quickly increase, and then the wheel will behave as if it is not fixed. The cost of the original lever is about 5,400 rubles, analogue - 2 000 rubles.

Before buying, it is necessary to check (preferably on the lift) the condition of the rear axle pillows and the flexible connecting shaft (from 9,000 rubles). Replacement - the procedure is very troublesome. In the Compact version of the rear differential pillow (from 700 rubles) almost always turns out to be broken.

The mechanical gearbox sometimes causes problems with switching, but the box itself is rarely broken. However, with the search for "BEU" details of difficulties will arise, and if necessary, you can buy a box or bridge for 10,000 rubles.

Plastic front seats reinforce the real space for the feet of the rear passengers.

Engines

As for the motors, the best reviews are collected by all 6-cylinder gasoline aggregates with a volume of 2.5 liters and above, set up in 323i, 325i and 328i. Fantastic gas reaction, long service life and beautiful sound - that's what they love them. From the "Round Six" should be avoided only by the one that got 320i. Motor consumes a lot of fuel and pulls badly.

The main disadvantage of "sixhores" is the high probability of overheating as a result of damage to the radiator, cracking the expansion tank and the malfunction of the water pump. In the latter case, the owners arguing themselves are to blame for: if the timing chain is almost eternal, then the pump too. Of course, this is a delusion. The cost of a new pump - from 2,400 rubles, radiator - from 5,000 rubles, and the expansion tank - from 1,300 rubles. Fortunately, the viscosity coupling of the cooling system fan is easy to repair, and the diagnosis of its malfunction takes a second.

4-cylinder units were upgraded several times. Early versions with timing belt (M40 / 1.6-1.8 L series) are not recommended due to the low life of the belt. You should search a copy with M43 equipped with a chain drive timing. The best among 4-cylinder E36 aggregates is undoubtedly a 16-valve engine with a capacity of 140 hp marked with the M44 index. He got 318is after 1996. Earlier versions of 318is with M42 are made of short-lived camshaft glands.

Three diesel engines were present in the line of power units. It is noteworthy that the weakest of them turned out to be the most reliable, although he cannot delve pleasure from driving. 2.5-liter TD and TDS have constant problems with the head of the block and high pressure fuel pump.

The trunk of 435 liters seems less. It's all about the wrong form.

Millions of versions

It is difficult to find two identical BMW E36, as the clients were offered dozens of colors and hundreds of options that could be combined as you like. In addition, many owners tried to independently remake their car by adding, for example, a M-bag. In addition, individual modifications have a significant amount of small differences. This applies not only to electrics. For example, 328i by body construction differs from 316i or diesel machines. Depending on the modification and year of the production of BMW E36, various types of incandescent lamps were installed in the front headlights.

On the inside of the trunk lid is a compartment with tools.

Conclusion

In Russia, where cars serve for 20-25 years, BMW E36 is not yet retro-classic, so that it can be purchased for some 40-50 thousand rubles. Alas, such proposals most often come from young drivers who bought E36 to take the soul, which was often ended with an accident, or the "death" of the car, the content of which they could not afford. Therefore, it is better to overpay for the perfect instance than a short time to replace the floor of the car.

Even premium cars in the mid-90s had manual windows.

History of the model

September 1990 - presentation.

1991 - the beginning of the production of sedan.

1992 - Exit version of the coupe and special version M3.

1993 - The model range replenished the convertible.

1994 - Compact version and 4-door m3.

1995 - Universal.

1996 - Small restyling. It is possible to distinguish only by turn signs: were orange, became white.

1998 - the presentation of the successor and change of generations of the sedan.

1999 - End of the production of wagon, cabriolet and coupe.

2000 - the end of the assembly of the Compact model.

Exterior and interior

The body rusts faster than in Sandy from Audi, but slower than in Mercedes. Places inside as much as in modern compact cars. Very good interior decoration.

Suspension

Neither the front nor the rear suspension is not impressive reliable. Even using the best details (for example, Lemforder), it is not necessary to count on multi-year exploitation without backlash and stuffs.

Engines

The strongest side of this model. Only a 2.5-liter diesel is far behind reliability. It is a pity that all the engines are too voracious.

Costs

Good accessibility of spare parts is a certain plus model. However, cheap workshops should be watched, which will rather spoil something than fix. This is already a fairly advanced car.

Typical problems and malfunctions

Corrosion - Fortunately, rarely on the power elements of the body.

Overheating of the engine due to the cracked expansion tank, refusal of the clutch of the radiator fan and the reluctance to periodically change the water pump.

A knock from the transmission due to the wine spider on the shaft.

Wear gear selection mechanism.

High rear axle.

Electrician malfunctions.

What to look for?

Sedan of the initial production period;

Coupe with a 4-cylinder engine. 318is - perfectly balanced and very fast;

Universal in version 325i and 328i.

What to avoid?

Budget coupe, especially with HBO;

Versions with a 2.5-liter diesel engine, especially with an "machine";

Archaic engines with a volume of 1.6 and 1.8 l - joy from driving no.

Specifications BMW 3 E36 (1991-2000)

Gasoline versions

Version
Engine
Working volume
Maximum power
Maximum torque
Performance
Maximum speed
Acceleration 0-100 km / h

Version
Engine
Working volume
Cylinders / Valve Location
Maximum power
Maximum torque
Performance
Maximum speed
Acceleration 0-100 km / h
Middle fuel consumption, l / 100 km

Diesel versions

Engine BMW M43. - four-cylinder piston engine SOHC, which replaced the M40 and was produced from September 1993 to 2002. (Not used on cars North America).

The serial assembly of the M43 engine, like the M40 motor, was produced at the BMW plant in the city of Steir. It was built in an amount of 1,254,420 units, which made the factory Steyr most productive in terms of the production of engines.

Engine improvements M43

• Roller chain camshaft drive;
• Valve drive from roller levers;
• Differentiated intake system (DISA);
• Increased compression ratio;
• Cylinder anti-knock adjustment;
• Contactless ignition system;
• Block of compact ignition coils;
• Engine control system (Motronic) company Bosch;
• Ventilation of the cylinder block controlled by pressure;
• Drive of auxiliary units Many-stream wedge belt;
• Thermostat with a response temperature of 95º C;
• Piston with a cut in the skirt to the zone of piston rings;

For the entire production period, the M43 motor was installed on (and), and ().

The engine volume varies from 1.6 to 2.0 liters. Compared to its predecessor M40, it has a double intake manifold path (the so-called individual intake collector of control) to ensure torque in a wide range of revolutions.

Thanks to the use of the DISA system (differentiated inlet system), the software already known, it was possible along with an increase in torque to achieve additional improvement in the nature of its change. The maximum torque is installed already at 3,900 revolutions per minute.

Further reduction in operating costs and service costs were achieved due to the use of a chain drive of the camshaft and a multiple wedge belt to drive auxiliary aggregates.

BMW M43 Motor - Device: 1 - Cylinder Head Cover; 2 - distribution shaft; 3 - roller coil; 4 - hydraulic clearance compensator in valves; 5 - Ignition Candle; 6 - balancing shaft; 7 - coolant pump; 8 - thermostat; 9 - wedge belt; 10 - oil filter; 11 - generator; 12 - inlet pipe with throttle housing;

Engine BMW M43B16.

The 1.6-liter option was supplied with Bosch Motronic 1.7.1 fuel injection system. and installed on ::

• BMW E46 316I.

Engine BMW M43B18.

Since 1993, a 1.8-liter M43 engine is available with fuel injection system - Bosch Motronic 1.7.1.
Installed on:

• (and) (from 1992 to 1998)
• (from 1994 to 1996)
• (from 1995 to 1996)
• (from 1995 to 2001)

BMW M43 Engine Characteristics

Technical parameters of engine BMW M40 and M43:

Engine	M40.		M43.
Modification	M40B16	M40B18.	M43B16.	M43B18.
Power (kW / hp) at 1 / min	73/100 at 5500.	83/113 at 5500.	75/102 at 5500.	85/116 at 5500.
Torque (nm) at 1 / min	141 at 4250.	162 at 4250.	150 at 3900.	168 at 3900.
Idle speed, 1 / min	800 ± 50.	800 ± 50.	800 ± 50.	800 ± 50.
Maximum rotational speed, 1 / min	6200	6200	6200	6200
Working volume, cm³	1596	1796	1596	1796
Cylinder diameter, mm	∅84		∅84
Piston stroke, mm	72	81	72	81
Compression ratio ,: 1	9,1	8,8	9,7	9,7
Minimum octane number, (according to the research method)	91		95
Ignition sequence	1342		1342
	91		91
Schitun Length, mm	140	140	145	140
Inlet valve, ∅ mm	42		42
Exhaust valve, ∅ mm	36		36
Maximum stroke of the inlet / release valve (at zero valve gap), mm	10,6/10,6	10,6/10,6	10,6/10,0	10,6/10,0
The duration of the open state of the inlet / release (º col. Shaft)	244/244	244/244	244/244	244/244
Inlet adjustment angle / Issue (º Col. Shaft)	104/108	104/108	104/110	104/110
Engine mass, kg	132		133

Engine BMW M43TU

The BMW M43TU engine is an upgraded version of M43, first of all in relation to such criteria for the work of vibration and acoustic parameters, torque, fuel consumption, as well as accounting by more stringent standards for the toxicity of exhaust gases. It uses similar details of the engine of the former specification M43 to the maximum extent.

1.9-liter M43 engine was introduced in 1998 and is known as well as M43B19..

Innovation in engine M43TU

• Single working engine volume - 1.9 liters;
• Engine cylinder block with mounting points for balancing shaft crankcase;
• Motor cylinder block with an engine shaft rotation speed sensor indoor node and reference signal sensor;
• The crankshaft with the drive gear for the balancing shafts and the incremental wheel for the engine shaft rotation frequency sensor and the reference signal sensor;
• Balance of balancing shafts;
• Modified power steering power distribution shaft;
• Pistons and connecting rods;
• Oil pallet, oil sewer and oil suction tube are adapted for an engine with balancing shafts;
• Thermal oil level sensor;

Innovations in components mounted on the engine M43 TU

• Thermostat for cooling with electronically controlled in the plastic case;
• Plastic intake system consisting of two parts;
• Plastic intake system with adjustable DISA intake path with a cassette valve for the upper power engine;
• Modular cable harness (out of 3 parts);
• Suction electric fan (not a fan with a viscous clutch);
• Electrically controlled ejector pump for brake amplifier on vehicles with automatic transmission;
• All water and fuel hoses between the engine and the aggregates of the car are equipped with high-speed connecting elements;

Innovations in the preparation and regulation of the fuel supply of the engine BMW M43

• BMS46 fuel injection injection system;
• BMS46 control unit with a housing with 134 pin conclusions for modular plug connectors (5 plug sockets);
• Film flow meter of the 5th generation (HMF);
• Valve nozzles werehed by air;
• Throttle nozzle with single-winding rotation angle regulator (EWD 3.2);
• Reducing secondary air;
• Heated oxygen sensors in front of the catalyst and after it;

This model of the power unit was available in two versions:

• since 1998, with a capacity of 118.3 hp (87 kW) and installed on:
  • — — ( , )
• since 1999, a motor capacity of 104.7 hp Installed on:
  • BMW E36 316I ()

BMW M43TU Engine Characteristics

Engine	M43B19 (UL)	M43B19 (OL)
Model	BMW 316i E46	BMW 318i E46.
Working volume, cube. cm	1895	1895
Cylinder diameter / piston stroke, mm	85/83,5	85/83,5
Inter-Cylinder Distance, mm	91	91
The diameter of the root bearing of the crankshaft, mm	60	60
The diameter of the connecting rod crankshaft bearing, mm	45	45
Power, kW / hp. - at the speed of rotation	77/105 - 5300 1 / min	87/118 - 5500 1 / min
Torque at rotation frequency	165 nm at 2500 rpm	180 nm at 3900 rpm
The frequency of rotation at which its limiter is triggered	6000 1 / min	6200 1 / min
Compression ratio	9,7:1	9,7:1
Inlet valve diameter, mm	42	42
The diameter of the exhaust valve, mm	36	36
Inlet / graduation valve stroit, mm	10,0/9,4	10,0/10,0
The position of the camshafts of intake / exhaust valves relative to the crankshaft	crankshaft rotation angle 100 ° / 106 °	crankshaft rotation angle 104 ° / 110 °
Engine mass (constructive group from 11 to 13), kg	138,3	138,3
Fuel		neeterized gasoline, octane number 95
Anathegonational regulation	there is	there is
DISA.	not	there is
Digital Electronic Engine Control System (DME)	BMS46	BMS46
Standard for the toxicity of exhaust gases	EU3.	EU2 and EU3 *

UL - lower power stage; OL - upper power stage; * - may be additionally programmed under the requirements of EU3 introduced since September 1998; Engine structure

Engine structure BMW M43

Cylinder block

The engine cylinders M43 was taken from M40 engine with minor changes.

Two points of the threaded connection for two detonation combustion sensors were new.

From the throttle to supply the oil to the head of the cylinder block, which in the M40 engine reduces the amount of oil with the help of a nozzle screwed into the upper part of the cylinder block, the M43 engine managed to abandoned the use of cylinder-adjustable cylinder ventilation in it.

The oil pump housing, as well as the oil pressure control system, as in the M40 engine, is embedded in the front cover of the cylinder block. However, loading the pressure control valve in the M43 engine is carried out through the channel in the mentioned lid. The oil canal in the cylinder block available in the M40 engine in the M43 power unit is covered with a seal with a cover.

Completed crankshafts for both M43 options (B16, B18) were re-developed. They have only 4 counterweights instead of 8, a larger radius of the crank cheek and by mass, respectively, 1 kg is easier.

In the M43 engine, roller valve drive levers are used, which are driven from the camshaft not with a cam, but through a roller planted on a needle bearing. Thanks to the roller lever, the friction force decreases to so much that only this fuel consumption is reduced by 3%.

The roller lever made by precision liter, in the process of manufacture does not require additional processing, except for the treatment of the hole under the roller bearing. To keep in the axial direction, it is provided with guides, thanks to which the need for a pressure element has disappeared, which in the M40 engine was needed for lever. Because of this, the upper plates of springs and crackers were changed.

Cylinder Block Carter Ventilation System

The SBS system in M43 is similar to the system.

Before the ventilation gases on the hose highway are discharged to the pressure control valve located on the intermediate flange of the DISA system, heated by coolant, in the labyrinth in the cover of the cylinder head, the oil separation is carried out. The pressure control valve skips, depending on the pressure ratio in the intake system and in the cylinder block, crankcase gases into the inlet inlet system.

Thus, pressure-adjustable ventilation is ensured and contaminated with cutter gas flow meters, an idling regulator and throttle knocker is prevented.

Head block cylinder

For M43 motor, due to the replacement of the gear belt in the drive of the camshaft on the chain drive, a new GBC had to be developed. It, as in the M40 power unit, is made according to the principle of the transverse stream and is made of cocal casting technology. The separation of the combustion chamber has not changed compared to the M40: 70% motor in the cylinder head and 30% in the piston cavity.

The cylinder head was modified under the new head and at the same time closes the chain crankcase. The lid consists of an aluminum casting made under pressure, acoustically isolated and corresponds to a lid with a change in the oil separation volume, which is installed on the engine M42 since September 1993.

Intake / exhaust valve

The mass of intake and exhaust valves was reduced compared to M40 due to changes in the shape of the valve sugar. The decrease in the mass of the valves allows to reduce the efforts of the springs. This leads, on the one hand, to a decrease in fuel consumption due to a decrease in the friction forces, and, on the other hand, to improve the acoustic characteristics of the engine due to the reduction of noise from the valves. These advantages are additionally significantly increased in the M43 engine due to the use of roller levers. This lever instead of the cam has a roller on a needle bearing, through which the camshaft presses the lever. Only these roller levers gave a decrease in fuel consumption by 3% when moving in a mixed cycle.

The roller lever is made precision casting and in the manufacturing process does not require additional processing, except for the processing of the hole under the roller bearing. For maintaining in the axial direction, it is provided with guides. Due to this, it was possible to abandon the pressure element, which in the M40 engine is mounted for lever.

Due to the absence of the pressure element of the M43 motor valve rods longer than M40.

Landing rings, guides, valve seals and lower plates springs are the same as M40. Double springs of valves, the upper plates of springs and crackers of valves differ from those used in M40 due to smaller springs.

ATTENTION: Valves, springs of valves, the upper plates of springs and crackers of valves can be confused with the corresponding parts of the engine M40!

Stretching device

The tensioning device of the chain is supplied with oil under pressure through the calibrated hole and sealed relative to the cylinder unit by means of a round-section ring.

The tensioning device of the chain consists of a light-gluing case, in which the steel sleeve is filled with a thickness of the wall 2 mm, the piston with the pressure spring and the displacement element, which reduces the oil volume and thereby prevents it from foaming. On the piston in the groove of 9 mm wide, a steel spring ring with a width of 8 mm is mounted, so that idle movement is limited when the engine is turned off and the nozzles are prevented when it starts.

The tensioning device of the chain during the manufacture is protected from the pop-up piston pop up, which must be removed after installation. When disassembling before dismantling the tensioning device, a safety pin should be returned to the place (special tool). If the piston jumped out, it is necessary to insert it back to the mounting sleeve (Special tool) to avoid damage.

The slide surface of the tension tire, along which the roller chain slides is covered with plastic. The tire guide is made of plastic.

Since there is a camshaft position sensor, which is taken from the M42 engine, the camshaft chain sprocket when installing must be installed in the correct position. To do this, there is an arrow on the asterisk.

The roller chain is conducted on the plastic guide tire.

Due to this chain drive, in which the chain does not change the directions in any way and thereby has a minimal length, it was possible to achieve maximum angles of sprinklers. Large girth angles make it possible to reduce the tension of the chain. This improves acoustic characteristics and friction decreases. In turn, the decline in friction increases the service life.

The cover on the cylinder block was adapted under the chain drive of the camshaft. Both the cover of the lid and gaskets of the upper and lower caps of the distribution gear are the so-called gaskets with leaf bearing elements. These gaskets are covered with elastomer and are made with a sealing corrugation. When the covers are installed, these gaskets cannot break and ensure reliable sealing of contacting surfaces.

The gaskets of the upper and lower caps of the distribution gears are available only in the form of single one-piece sealing elements.

To increase power in the upper speed of the rotation frequency, the connecting valve (starting approximately from 4200 rpm) between both pipes opens. The dynamics of the supply pipes as a result is significantly reduced. Working now short resonant pipes provide high speeds of high power rates.

DISA system

Connecting damper of the dish system is controlled from the control unit of the DME 5.2 system and has an electropneumatic drive. The flap opens with an increase in the rotational speed, starting with 4240 rpm, and closes (with some delay - hysteresis) with a decrease in the speed of rotation, starting from 4160 rpm. This is necessary to prevent a sharp change of opening and closing processes.

The damper management includes a vacuum regulator with a pneumatic actuator, a control unit with its own vacuum chamber, a solenoid valve and a check valve.

In the range of partial loads under the influence of reduced pressure in the inlet gas pipeline, the camera is evacuated. The connecting flap is closed with a vacuum regulator and a pneumatic executive body.

M43TU engine device

Cylinder block

The M43 cylinder block was used as in the previous modifications M43 - from gray cast iron. For cooling the pistons, as before, in the bed of the indigenous bearing in the cylinder block, 4 olted nozzles are mounted.

The innovation in the cylinder block is the presence of a hole for setting the engine speed sensor and the reference signal (Hall sensor) in the rear root bearing area of \u200b\u200bthe crankshaft. The flange, equipped with two unloading sleeves between the third and fourth crankshaft bearings, serves to attach the balancing shaft crankcase. Balancing shaft lubrication provides an additional oil canal.

Engine cylinder block M43: 1 - block of cylinders with pistons; 2 - oil nozzle; 3 - Bolt with hex head M10x75; 4 - lid; 5 - plug; 6 - centering sleeve with a diameter of 10.5 mm; 7 - centering sleeve with a diameter of 14.5 mm; 8 - centering sleeve with a diameter of 12.5 mm;

Like all cast cylinder blocks, the M43 unit can be twice crushed:

• the first boring is 0.25 mm;
• the second boring is 0.50 mm;

Crankshaft

Casting shaft with 4 counterweights has 5 support bearings. On the 6th cheek of the hot landing pinned the drive wheel of the balancing shafts with 90 teeth. Near the rear root bearing, an incremental wheel is screwed for a rotational frequency sensor and reference signal.

• the course of the crankshaft is 83.5 mm;
• the diameter of the root bearing is 60.0 mm;
• the diameter of the connecting rod bearing is 45.0 mm;

M43TU engine crankshaft with balancing shaft drive: 1 - drive of balancing shafts; 2 - drive of balancing shafts, cross-section; 3 - crankshaft; 4 - rotation frequency sensor and reference signal;

Pistons and connecting rods

To reduce the toxicity of exhaust gases and a new piston is used to match the changed diameter of the cylinder.

• piston diameter - 85 mm;
• heat belt - 5 mm;

Piston rings:

• Gallock 1: Cylindrical compression ring with surface coating;
• Gallock 2: Conical compression ring;
• Groove 3: U-shaped spring oilmaging ring;

For the maximum possible reduction in the wear of the 1st piston groove, its surface is tight anodizing.

A narrow U-shaped spring oil lifting ring during installation requires exceptionally great caution.

Attention!

In no case cannot be installed using a coupling tape. The oil surcharge can be easily broken or damaged. Use only the mounting sleeve from the BMW special tool kit. In the mounted condition, damage or breakage of the oil surcharge ring is invisible. The consequences are manifested only after long-term operation.

Optimized for weight parameters forged rods with a length of 140 mm with bearing lids obtained by the rod head is replaced by the rods of the former M43 motor. These connecting rods are also used in the M43 engines of the E36 family from September 1997.

Balancing shafts and balancing shafts

Improving the smoothness of work and improving the acoustic characteristics of the engine is achieved due to the use of two rotating trees in opposite directions equipped with unbalanced masses. One of the shafts is driven directly from the gear wheel sitting on the crankshaft.

Carter and balancing shafts are selected pairwise to each other and should not be used separately. Open Carter is impossible. Both half of the crankcase are pulled by bolts with shaped heads. For fastening the crankcase to the cylinder block uses tie bolts with hexagon heads with an inseparable washer.

The gap between the profile surfaces of the teeth of the toothed wheel of the balancing shaft and the crankshaft can be added using remote washers. Remote washers (there are washers 15 different sizes in thickness) are installed between the cylinder block and the balancing shaft crankcase.

M43TU engine balancing trees with balancing shaft drive: 1 - crankshaft; 2-drive of balancing shafts; 3 - leading balance shaft; 4 - Carter balancing shafts; 5 - Leading Balancing Shaft; 6 - balancing shaft;

Attention!

Carter balancing shafts together with shafts weighs about 8 kg.

The gap between the profile surfaces of the teeth (average of 4 measurements in the mounted state of the engine) is 0.06-0.09 mm.

The adjustment of the gap between the profile surfaces of the teeth of the crankshaft and the crankcase of the balancing shafts should be done very carefully. In this regard, it is necessary to accurately implement the instructions available in the repair work manual.

IMPORTANT When installing a new balancing shaft crankcase, first lay the thickmost remote washers. This ensures that gear wheels will not be damaged.

The too small gap between the profile surfaces of the teeth leads to the occurrence of the conducting noise. Too big gap leads to knocking noise.

Daily oscillations and flywheel

The absorbent oscillation damper is mounted in the axial direction, is mounted ahead on the crankshaft. The incremental gear on the vibration damper is absent.

Cars with an automatic transmission switch, as with the former M43 engine, are equipped with a flywheel made of sheet metal. All cars with mechanical gearbox are equipped with a two-mass flywheel (ZMS).

Clutch

With this engine, a clutch of type SAC is used with other models.

SAC means grip with automatic working clearance adjustment (Self Adjusting Clutch).

Oil supply system and oil pan

Oil supply to various parts of the engine is provided by an oil pump with internal engagement gears. The compact oil pump is taken from the former modification of the M43 engine and is characterized by smoothness of work and high performance. Not requiring maintenance The oil pump is driven directly to the crankshaft. The oil pump and its drive correspond to the design of the former motor M43.

The new oilshield tube from plastics was adapted for new installation conditions.

Reducing oil foaming and a decrease in its temperature ensures 1.5 mm thick oil reassigner, made in the form of a detail made of deep metal extractor.

Between the oil pan, made of aluminum casting, and the motor cylinder block has a rubber profile gasket.

The design of the filter cartridge, which is fixed on the latch in the oil filter cover, facilitates its replacement. By device, the oil filter is similar to the oil filter of the preceding model.

Head block cylinder

The CCC made with diametrically opposite intake and outlet channels, is made by chilling casting. The separation of the combustion chamber remains unchanged: 70% - in the cylinder head and 30% - in the cavity of the piston.

Cylinder head M43: 1 - head of the cylinder block; 2 - valve guide sleeve; 3 - installation pin M7x55; 4 - nut flange M7; 5 - installation pin M7x55; 6 - mounting pin M8x45; 7 - A10x13,5-Al sealing ring; 8 - threaded plug M10x1; 9 - M18x1.5 threaded plug; 10 - inlet saddle ring. Clap; 11 - Ring of the saddle edition. Clapan;

The head of the cylinder block was managed to take from the previous power unit, making only small changes. So, due to the fact that the plastic intake tract is now used, the planting flange of the suction system has been increased. The channel was also modified leading to ignition candles.

The cylinder block laying is changed in accordance with the increase in the diameter of the cylinders.

Cylinder head cover

The cap of the head of aluminum casting, made under pressure, and the laying of the cylinder head cover remained unchanged.

Cylinder head cover M43: 1 - Cylinder head cover; 2 - sealing cover of the lid; 3 - lock cover of the oil pipe; 4 - Bolt with Burtle M6X42.5; 5 - Piercing washer; 6 - rubber gasket;

Valves, Valve Drive and Valve Timing

Valves, valve guides, rings Valve saddles, valve rod seals and valve drive roller levers managed to take from the previous model unchanged. New are the conical single springs of valves, as well as the valve plates at the top and bottom.

Camshaft and valve M43: 1 - camshaft; 2 - lever of the roller pusher; 3 - compensator; 4 - inlet valve; 5 - exhaust valve; 6 - Remkomplekt Moxoome. caps; 7 - springs plate; 8 - valve spring; 9 - springs plate; 10 - Truck valve; 11 - oil pipeline; 12 - hollow screw; 13 - bolt with hexagon head;

As before, all the advantages, namely, friction strengths, reduced by reducing the mass of the valves and its spring, roller levers of valve drives on needle bearings, light gap hydrocompensators, are positively affected by fuel consumption and acoustic characteristics of the engine.

• The diameter of the inlet valve plate is 42 mm;
• The diameter of the discharge plate - 36 mm;

Cross section of the head of the engine cylinders M43TU: 1 - distribution shaft; 2 - valve drive roller lever; 3 - gap hydrocompensator; 4 - valve spring (conical); 5 - valve; 6 - head of the cylinder block;

Camshaft

The intake and exhaust valves are powered by a camshaft located above the cylinder block and roller levers of valve drives.

The distributional shaft made by the technology of the hollow casting from the bleached cast iron has 5 points of the support, the bindings of the camshaft are detachable.

At the top of the power stage, the same camshaft is used as in the engine M43 car E36 family. The new engine design that does not have an inlet system with an adjustable inlet length (DISA) is adapted to a new distribution shaft for the engine of the lower power stage.

Engine timing mechanism

As in the M43 motor of the BMW E36 family, the camshaft is driven by a single row roller chain. The camshaft drive does not require maintenance during the entire service life.

Drive chain Mechan. gas distribution in M43: 1 - drive chain; 2 - asterisk; 3 - M7x20 hexagon head bolt; 4 - asterisk; 5 - segment key 5x6.5; 6 - guide; 7 - Screw with spherical headband with a row. 8 - guide; 9 - cylindrical head bolt with M6X25-Z1 washer; 10 - stretching bar; 11 - sleeve; 12 - hex head bolt with M8X50-Z1 washer; 13 - chain tensioner; 14 - ring round 9x1.5; 15 - cylindrical head bolt with M6x20-Z1 washer; 16 - Wheel of the pulse sensor; 17 - Piercing washer;

A sector disk, designed to reliably determine the corner position of the camshaft by the Hall sensor, is screwed to the camshaft.

To reduce the cost and mass, the tension and guide strip is made of plastics.

The tensioning chain mechanism is similar to the mechanism of the former engine M43.

Engine switchgear cover

To improve the quality, the material and the design of the lower cover of the engine of the engine of distribution gear wheels were improved.

The top cover of engine switchgears has been subjected to the following changes:

• a modification of a new camshaft position sensor has a single housing with a plug connector;
• added fasteners under the details of the pressurized air system

Both engine switchgear caps are sealed with a rubber profile laying from improved material with a modified circuit.

Engine crankcase ventilation

Changes not underway the ventilation system of the motor crankcase adjustable by gas pressure. Before the gases derived from the crankcase will reach the hoses to the reducing valve, oil is separated from them in the labyrinth of the cylinder head cover. Depending on the pressure ratio in the intake system and in the engine crankcase, the reducing valve skips gases accumulating after throttle, in the intake system.

Thus, it is prevented by contamination of such nodes as an air flow meter, an idle regulator and a throttle valve.

Ventilation M43 motor crankcase: 1 - crankcase ventilation valve; 2 - cylindrical head bolt with M6x20-Z1 washer; 3 - hose; 4 - Hose mounting clamp L18-24; 5 - Hose mounting clamp L15-19;

M43 inlet system

To reduce the mass, M43B19 motors are equipped with two parts inlet system made of plastic. Both parts are connected by the intermediate aluminum plate, which opens the hose for the removal of the ventilation gases of the crankcase. A sound-absorbing cap will be put on the upper part.

Engine intake system M43: 1 - intake pipeline upper part; 2 - intake pipeline lower part; 3 and 4 - installation pin; 5 and 7- profile gasket; 6 - flange; 8 - executive node; 9 - ring round 75x2.5; 10 - nut flange M7; 11 - Hexagon Bolt with M7x100-Z1 Washer; 12 - screw;

In order to obtain a good nature of the torque change in the low rotation frequencies, the upper power motor motor, as before, is equipped with a differentiated intake system (DISA).

The principle of its work is based on the use of intake MHE, different lengths, in different ways acting from a dynamic point of view.

The plastic node, also called a cassette flap, contains a DISA flap, a membrane mechanism of a vacuum regulator of the ignition, vacuum chamber and an electromagnetic valve. The entire node, according to the design similar to the same node, is inserted into the inlet system and fastened with screws. When repaired, the entire node should be replaced.

Due to the single working volume in 1895 cm³, the inlet system without a cassette plug-in unit can be used for the bottom stage of the power (77 kW). A hole of the suction tube under a cassette plug-in block closes with a lid.

Air filter inlet

The intake system was completely recycled to reduce the level of inlet noise.

An additional acoustic resonator is installed on the filter housing. This resonator is a hollow plastic casing. Its task is to reduce intake noise in a certain range of oscillation frequencies.

Compared to the predecessor model, the filter surface was increased, which ensures a long service life.

Prepared by secondary air

To further reduce the contamination of exhaust gases, the M43B19 engine is equipped with a system of pressing secondary air.

Principle of operation :

• The catalyst transforms the spent gases only from the temperature of about 300º C. On the stage of starting a cold engine, the concentration of unburned hydrocarbons and carbon monoxide in the exhaust is very high. The decrease in the pollution of the exhaust gases is achieved by thermal afterburning, when hydrocarbons (HC) and carbon monoxide (CO) are oxidized in the exhaust oxygen, converting respectively into water and carbon dioxide.
• Depending on the coolant temperature, after starting the cold engine, the secondary air pump is turned on at exactly a certain time. The duration of its work, depending on the temperature at the start, can be up to 120 seconds. After this time, the catalyst is warm and cleans the exhaust gases.
• Two-stage secondary air pump has an electrical drive. Vacuum chamber, electrical switching valve and check valve are fixed on the top cover of distribution gear.
• Superior air is performed through a cast flange on the graduate manifold.
• In the engine of the upper power of the power, all parts intended for the pressurization of secondary air are mounted since the beginning of mass production. They were in full on their functions only after reprogramming on the parameters of the exhaust toxicity of the exhaust gases EU3 since September 1998.
• In the EU3 D version, the secondary air pump is also briefly activated after starting. However, this is done only for pumping the pump.

Wiring harness M43

Since the beginning of the release of cars of the E46 family, the engine wiring harness with modular design (3 components) is used:

• Module 1/2 - gearbox (mechanical / automatic)
• Model 3 - Engine
• Model 4 - Ignition System

Belt drive

Auxiliary aggregates, namely:

• water pump;
• generator;
• the auxiliary pump of the hydraulic steering amplifier is activated from the crankshaft by means of not requiring the maintenance of the polyclinic belt;

In a mechanical device for tensioning a belt known in the previous models, a new tensioner roller is applied.

Engine belt drive M43TU (1st plane drive): 1 - water pump; 2 - guide roller; 3 - generator; 4 - tensioning roller; 5 - crankshaft; 6 - auxiliary pump hydraulic steering amplifier;

In the secondary plane of the belt drive from the crankshaft to the air conditioning system, a mechanical belt tension device is used. Air conditioning compressor (SEIKO SS 120) is also activated by a polyclinite belt.

M43TU engine belt drive (2-plane): 1 - air conditioning system; 2 - crankshaft; 3 - tensioning roller;

BMS46 engine control system

The BMS46 engine control system of the VMW firm is designed for the engine M43TU.

The engine is designed for optimal torque and for smooth operation is equipped with balance sheets.

This BMS46 / EU III engine control system was used in the E46 family cars and was first used on the M4ZV19 engine.

Control instrument hardware:

• sKE control device (SKE - serial structural standard housing);
• model design of plug connectors (5 separate plug sockets);
• 134 pin withdrawals;
• tire CAN;
• since September 1998, the requirements for the toxicity of the exhaust gases EU ιιι are fulfilled;
• flash storage device;

Sensors / Executive Organs

• 4 ignition coils with contactless distribution;
• serial injection;
• fuel air flow meter HPM 5;
• sensor position of the crankshaft and camshaft (Hall sensor);
• 2 acoustic detonation sensors;
• throttle valve potentiometer;
• no change controller with modified control;
• heated oxygen sensors in front of the catalyst and after it;
• measurement of the temperature of the input air, the temperature of the coolant, temperature at the outlet of the radiator;
• controlled ventilation valve DISA fuel tank (but not at 77 kW engines);
• serial electric fan;
• electronic anti-theft system EWS 3.3;
• a mounted system of pressing secondary air, as on the engine M44 (starting with SE December 1997);
• electrically controlled engenerate pump hydraulic brakes;
• pulse nutrition of ignition coils through an unloading relay;
• valve nozzles werehed by air;
• electron control thermostat;

Digital E-Motor Control System Features (DME)

• control of the ignition and injection advance angle;
• adaptive anti-knockdation plotting adjustment;
• regulation by oxygen content in og with the help of sensors in front of the catalyst and after it;
• adaptive fuel tank ventilation management;
• the function of nutrition of the drive system;
• air conditioning compressor management;
• control of engine startup and warm-up phases;
• electronic anti-theft system EWS 3.3 with connector for tires to;
• management of the DISA system;
• adaptive idle regulation;
• catalyst protection by controlling low-voltage and high-voltage windings of ignition coils;
• stepless adjustment of the operation of the electric fan signal with pulse modulation;
• frequency limit rotation: 6200 rpm for engines 87 kW and 6000 rpm for 77 kW engines;
• determining an increased speed of rotation (the function is laid in the BMS control device and is still available for service);
• thermostat control (electronic control);
• indication of pressure and oil level on the instrument panel of double lamp of red / yellow colors;
• transmission of information about the temperature and frequency of rotation of the engine to the dashboard on the CAN bus;
• fuses in wiring harness;

Contactless ignition system

The block of coils of the contactless ignition system for four-cylinder changes has not undergone. Only the supply voltage of the terminal 15 is supplied through an unloading relay.

In the BMS46 system of the car 30/15 and 87, protected by fuses included in the wiring harness. Fuses are installed in the fuse block (under the hood of the engine on the left in the direction of movement) next to the BMS46 control unit.

Functioning of the oscillations of the drive system

This function provides exhaustion of oscillations arising in the actuator system with a sharp turnpoint of the engine torque and the moment of the load forces.

The vibrations in the drive are detected by the crankshaft position sensor and analyzed by the control unit.

Calculation of oscillations in the drive is ensured by reducing the ignition advance angle.

Fuel injection / valve nozzles

Through the valve nozzles, airborne, air directly (without magnetic valves) is absorbed from the inlet gas pipeline.

The hose attachment site is between the HFM5 flow meter and the input to the throttle knot.

This means that the amount of suction air depends on the vacuum in the inlet gas pipeline.

Air on hoses is distributed between 4 valve nozzles.

With full load in the injection unit, the fuel pressure is about 3 bar.

Film Air Flowmeter HFM 5

Air flow meter LMM 5.2 is replaced by HFM 5 air flow meter.

A feature of this flow meter is that the film sensitive element is no longer hanging freely in the suction funnel, as in the HFM 2 flow meter, and is fenced with an S-shaped plastic labyrinth.

HFM5 air flow meter

Crankshaft position sensors and distribution shafts

The crankshaft position sensor is a Hall sensor that gives a signal only after the shaft begins to rotate.

It is located on the back of the engine under the starter. The sensor wires are not shielded, and twisted.

The pulse sensor wheel, as in the M44 engine, is mounted on the crankshaft between the 3rd and 4th cylinders.

The camshaft position sensor is a Hall sensor, which is a fixed engine with a stationary sector or depression between the teeth.

Sensors of detonation combustion

These sensors are sensors of sound oscillations propagating in a solid and operate, as in the DME 5.2.1 system, according to the differential principle. The connective wires of the sensor are not shielded, and twisted.

Throttle valve potentiometers

The working ranges of potentiometers lie approximately from 0.5 to 4.5 volts.

Idling regulator

The control of the idling regulator was changed. Both coils are connected to the overall mass of the control unit and are connected to the "plus" through the power transistors in the BMS control device with a power factor of the pulse from 4 to 94%. The main frequency, as before, is 100 Hz.

The signal on the on and off of the air conditioner compressor is transmitted over the CAN bus.

Oxygen sensor

In the BMS46 system in front of the catalyst, and after it is used by a potential-free sensor LSH 25 (sensor on zirconium dioxide) of the company Bosch.

The sensor standing after the catalyst (control sensor) is fully operational.

The temperature of the exhaust gases is determined by software means by calculation.

Prepared by secondary air

The device and functioning of the system of pressurization of secondary air are comparable to those as the engine M44.

Fuel tank ventilation valve

The fuel tank vent valve is activated with variable filling of the period of the controlled pulse.

In the BMS46 motor control system, the filling rate of the pulse at idling is about 5 - 8%, and at the same time the fuel tank ventilation valve is open to the minimum extent.

Cooling fluid and air temperature sensors

In the BMS46 control system, a thermistor coolant temperature sensor is used, the signal of which is transmitted to indicate the temperature on the instrument panel over the CAN bus.

Thermistor intake temperature sensor is mounted in HFM 5.

Radiator output temperature sensor / Electronic temperature adjustment

The thermal resistance at the outlet of the radiator is used for electronic temperature adjustment. With similar adjustment, the diet of pulses is used.

Works electronic cooling system as well as on. Of course, the characteristics are coordinated with the corresponding engines.

At low load on the engine, a high cooling fluid temperature is set (about 105ºC), which optimizes fuel consumption.

With high load, the coolant temperature is adjusted from 85 to 100ºC. Due to this, the engine works optimally in terms of power.

On BMW cars due to the danger of burns, a radiator tube with heat fuse from unscrewing is always used.

Inlet system with adjustable DISA inlet tract length

All engines with BMS46 have a differentiated intake system, only the engine M4V19 with a capacity of 77 kW from it managed to refuse.

Regulation of the design is carried out depending on the frequency of rotation and load. The load signal can be removed through the DIS tester.

There is the following "Iron" rule:

• at the speed of rotation below, 3000 rpm on the DISA is always input \u003d "Long intake tract";
• at the speed of rotation above 4100 rpm on the DISA, the inlet is not produced \u003d "short intake tract";

Electrical fan control

Engines with BMS46 do not have a fan with a viscous clutch, and equipped only with an electric fan.

The electrical fan control is made by the BMS46 control unit through the terminal stage of the power amplifier on the fan motor. Control is carried out at the main frequency of 110 Hz with shim signals (PWM \u003d latitude-pulse modulation).

The fan rotation frequency depends on the temperature at the outlet of the radiator and on the pressure in the air conditioner.

With an increase in the velocity of the vehicle, the fan speed is reduced.

The filling coefficient of the pulse period is from about 10 to 90%. When filling the pulse period less than 5% and more than 95%, the fan in rotation is not given, which allows you to securely detect faults.

Adjustable fan drive is used with a gasoline and diesel engine of the E46 family of the car.

Note: In the E36 family (with the BMS46 system), the fan turns on two-stage. The first stage is turned on through the relay, and the second stage - through bimetallic contact in the coolant circuit or pressure in the air conditioner.

Electronic anti-theft system EWS 3.3

Connecting an anti-theft system EWS 3.3 to the on-board network of the E46 family of the E46 family in full

The channel, which, from the EWS control unit, passes the authorizing signal to the control unit of the corresponding engine control system, is blocked by a variable code that changes each time the engine is turned on.

Due to the fact that the control unit is rigidly tied at the factory to the car data, its replacement (trial replacement) is no longer possible.

Compatibility EWSII / EWS III:

• the EWSII and EWS III control units can interact with the control units of the digital electronic engine control system (DME) with EWSII and EWS III interfaces. Due to this, it is possible to use the EWS III system by the body, regardless of the application of "new" DME control units.

At the same time, the following system configurations are formed:

• if the EWS II control unit is used in conjunction with EWS II DME, the resulting system is indicated as EWS II.2, and if it works in conjunction with EWS III DME, the EWS II.3 system is formed. Similarly, this designation refers to a combination of the EWS III control unit with both DME variants;
• when replacing the EWS control unit, it is necessary through the company's central bureau to purchase a control unit pre-configured through DOM data bank, as is done when ordering spare keys;
• when replacing the engine control unit, you must act as follows:
  • install a new control unit by taking it from the spare parts warehouse;
  • programming via MODIC / DIS;
  • after programming, this control unit is rigidly tied to the car and can no longer be installed on another car (the trial replacement is excluded);

Ejector pump with electrical control to enhance pressure in the brake drive

In the "unchanging" state, the ejector pump is open, thus contributing to an increase in pressure in the brake drive system.

The ejector pump with electrical control serially installed only on models 316 / 318i models with automatic gearbox.

Air leakage is compensated through the idle regulator.

Moments on and off:

when the antique gearbox lever is in the "D" position, the solenoid valve is not under the current and, therefore, contributes to an increase in the brake force;

when the automatic gearbox lever is in the positions "n" or "P", then at temperatures above 35 ° C (by thermistor sensor temperature of the coolant), the electromagnetic valve is under the current and therefore does not contribute to an increase in braking force.

Sprinkage of contacts of the 134-pin modular plug connector

Specific connecting of contacts for this car and installation location, define the DIS or Modic test.

BMW M43 Engine Problems

Some faults that are possible in the M43 engine:

• destruction of gasket GBC in the area of \u200b\u200bthe fourth cylinder;
• fuel injectors with the supply of turbulizing air flow;
• destruction of the DISA node;
• damage to the crank-connecting mechanism is possible;
• oil leak;

Engine BMW M43B18.

Engine characteristics M43.

Production	Steyr Plant.
Engine brand	M43
Years of release	1992-2001
Cylinder block material	cast iron
Supply system	injector
A type	in line
Number of cylinders	4
Valves on cylinder	2
Piston stroke, mm	81
Cylinder diameter, mm	84
Compression ratio	9.7
Engine volume, ccmm	1796
Engine Power, L.S. / Ob. Min	115/5500
Torque, Nm / Ob.min	168/3900
Fuel	95
Environmental norms	Euro 2-3.
Engine weight, kg	133
Fuel consumption, l / 100 km (for 318i E36) - city - Rouss - Mixed.	11.0 6.2 7.9
Oil consumption, gr. / 1000 km	up to 1000.
Engine oil	0W-30 0W-40 5W-30 5W-40 10W-40 15W-50.
How much oil in the engine, l	4.0
Replacing the oil is carried out, km	7000-10000
Engine operating temperature, hail.	90-95
Engine resource, thousand km - According to the plant - on practice	- 300+
Tuning, L.S. - Potential - without loss of resource	150+ n.D.
The engine was installed	BMW Z3.

Reliability, problems and repair of the engine BMW M43

An inline four of the M43 family (it also includes it), published in 1992 as a substitution. The M43 cylinder block was almost unchanged from M40, the crankshaft now has 4 counterweights (there were 8 per M40) and lost a little in weight, the move remained unchanged. In addition to the crankshaft, pistons have changed, the compression ratio to 9.7 has increased.
The head of the cylinder block has changed significantly under the timing chain drive (there was a belt), the chain serves about 300 thousand km. The camshaft one (SOHC 8V), the rockers are changed, the valves are facilitated, the springs are distinguished, the hydrocomathers are not used. Valve diameters have not changed: intake 42 mm, graduation 36 mm. Characteristics of the standard camshaft M43B18: phase 244/244, lifting 10.6 / 10 mm. Also, the intake manifold with an adjustable DISA length was used on M43B18, which made it possible to increase the torque of both low and high turns. The ignition system has undergone changes.
This motor was used on BMW vehicles with index 18i.
The replacement of the engine was released only in 2001, in the face of the two-liter, which during the year took place M43B18.

Problems and disadvantages of BMW M43B18 engines

1. Leaves of oil. The usual case for the engine M43, the valve cover is often flowing, is treated with a replacement of gasket with sealant and kVKG.
2. knock, crash, engine noise M43. Foreign noises often creates the failed DISA flap. Check, look for remkomplekt and enable in order. The hydrocompensators are stared less often.
In addition, there are problems typical for the past M40B18: dips during acceleration, floating turnover, overheating, you can read in detail about them.
But the main minus for the owner is not even this, the main lack of engine M43, it is its low power. The power plant is very weak, even the light E36 with M43 goes very sluggish and inappropriate the imagine BMW as a sports car.
Summing up, it must be said that despite all of the above, the BMW M43 engine is quite reliable and has a good resource, with proper care and maintenance, is able to roll back not one hundred km. However, those specimens that are presented on the market today, their own excavation and trouble-free operation are not waiting.

Engine tuning BMW M43B18

Atmospheric. Stroker

The easiest and rided way to increase the engine power M43 is a row with head from /, basic manipulations are described.
You can go to another way and install a cold inlet, a sports intake manifold and camshaft with a phase from 266-272 (from dbilas for example), the exhaust manifold 4-2-1, to flash and squeeze another 20-30 hp, losing a little in the nose.
The most correct choice is to buy a BMW M50-52 contract engine and install an initially powerful and reliable engine.