The prototype of the G15MF engine was the Opel C16NZ power drive. Korean engineers have made the following changes to the design of the German engine:

• the outlet pipe of the cooling system is installed in the rear cap of the cylinder head;
• changed the configuration and size of the combustion chamber;
• used original oil pump;
• the shape of the pistons has changed, the diameter of the cylinders has been reduced;
• the ignition system has been modified for the G15MF configuration.

In 2002, during the restyling of Daewoo Nexia, the engine was improved to 130 Nm and 85 hp. with. by increasing the piston stroke to 81.5 mm, installing a 16-valve cylinder head with two camshafts according to the DOHC scheme. However, this ICE was assigned a new A15MF index, and its production was discontinued in 2008 at the same time as the G15MF, since they did not reach the Euro-3 environmental protocol.

Specifications G15MF 1.5 l/75 l. with.

Initially, the engine did not have a lambda probe and a catalytic converter, therefore, with the tightening of requirements, it was replaced by more advanced modifications. The engine diagram was copied from the German Opel Kaddet E in 1994:

• inline four for a transverse arrangement under the hood;
• SOHC gas distribution scheme with one camshaft;
• adjustment of the mixture with a potentiometer by analogy with the VAZ 2110.

Forcing is possible by classical methods to increase power, and do-it-yourself overhaul in garage conditions without the involvement of specialists.

For its time, the G15MF motor had progressive technical characteristics:

Manufacturer	Daewoo
ICE brand	G15MF
Years of production	1994 – 2008
Volume	1498 cm3 (1.5 l)
Power	55.4 kW (75 HP)
Torque	120 Nm (at 3400 rpm)
Weight	117 kg
Compression ratio	8,5
Nutrition	injector
motor type	in-line petrol
Ignition	switching, non-contact
Number of cylinders	4
Location of the first cylinder	TVE
Number of valves per cylinder	2
Cylinder head material	aluminum alloy
Intake manifold	duralumin, channels of different lengths
An exhaust manifold	cast iron
camshaft	original cam profile
Block material	cast iron
Cylinder diameter	76.5 mm
Pistons	original
Crankshaft	AA-DW000
piston stroke	81.5 mm
Fuel	AI-92
Environmental standards	Euro 1/2
Fuel consumption	track - 7 l / 100 km combined cycle 8.8 l/100 km city ​​- 10.5 l / 100 km
Oil consumption	maximum 0.6 l/1000 km
What kind of oil to pour into the engine by viscosity	5W30, 5W40, 0W30, 0W40
Which oil is best for the engine by manufacturer	Liqui Moly, LukOil, Rosneft
Oil for G15MF by composition	Synthetic in winter, semi-synthetic in summer
Engine oil volume	3.75 l
Operating temperature	95°
ICE resource	claimed 200,000 km real 250,000 km
Adjustment of valves	screws
	forced, antifreeze
coolant volume	7 l
water pump	with plastic impeller GVG-90A
Candles for G15MF	BPR6E from NGK or domestic AU17DVR
spark plug gap	0.8mm
timing belt	original Goodyear G1116H 111H9.5P170, to replace Gates K15310XS
The order of operation of the cylinders	1-3-4-2
Air filter	Nitto, Knecht, Fram, WIX, Hengst
Oil filter	with check valve
Flywheel	6 holes, one offset
Flywheel mounting bolts	M12x1.25 mm, length 26 mm
Valve stem seals	manufacturer Goetze
Compression	from 10 bar, difference in adjacent cylinders max. 1 bar
Turnover XX	800 – 850 min-1
Tightening torque for threaded connections	candle - 31 - 39 Nm flywheel - 35 Nm clutch bolt - 19 - 30 Nm bearing cap - 68 - 84 Nm (main) and 43 - 53 Nm (connecting rod) cylinder head - three stages 20 Nm +65° + 65° + 65°

The factory manual necessarily contains both a description of the parameters of the motor, and step-by-step operations for the repair / maintenance of the internal combustion engine to maintain warranty obligations and the service life declared from the factory.

Design features

The one and a half liter single-shaft gasoline in-line engine G15MF was created before the advent of Euro-2 standards, so the design feature is an extremely simple exhaust tract without a catalyst and a CO probe. The remaining nuances of the internal combustion engine were:

• modernization of the injection system - the injection here is distributed, but simultaneous, regulated by a potentiometer, as in domestic Ladas;
• refinement of the combustion chambers - these engines have a smaller cylinder diameter compared to the prototype, and the domed shape of the chamber, partially continued in the piston;
• according to the manufacturer, oil consumption is within 300 g / 1000 km, and gasoline is 8.8 l / 100 km in the combined cycle;
• a flat-tooth timing belt from the leading Gatez brand with a 200,000 km life, although the valves are already safe here, they cannot meet the pistons.

The gas distribution system is made according to the SOHC scheme with one camshaft. In comparison with the sample, the volumes of the combustion chambers are reduced, the power will be increased only in the next series of Daewoo engines - A15MF.

To increase the resource, the attachment is driven by a separate belt, the condition of which is recommended to be monitored every 20 thousand km, and changed after 50 thousand.

After the introduction of the Euro-3 and even Euro-4 regulations, Daewoo management continued to install these obsolete power drives on the Nexia and Espero until 2008. Compactly located attachments do not interfere with major repairs, including on their own.

Advantages and disadvantages

The strength of the Daewoo concern has always been concern for the user, so the motor has an OC (octane number) switch - from the four proposed options 95, 92, 87 and 83, the user can choose any by simply switching the wires. For example, the A-76 octane number is approximately equal to 82, so the engine “digested”, even 76 gasoline.

The next advantage was a resource of more than 250 thousand km between capitals. At present, even with improved designs and layouts of nodes, such a resource for power drives is a rarity.

The main disadvantage of the G15MF is the magnetoelectric sensor of the ignition distribution system. The wires are constantly soldered, repairs do not help for a long time. When replacing the sensor, you should focus on a mileage of 10 thousand km. If during this time the device has not failed, it will last a long time. If the malfunction repeats, it is better to replace the sensor with a new one.

The original cylinder head is suitable for tuning - a camshaft with increased phases can be placed inside.

List of car models in which it was installed

The G15MF engine was used for several versions of Daewoo cars:

• Lemans 5i sedan 1C4 - 1994 - 1995;
• Cielo sedan - 1995 - 2000;
• Cielo LoadRunner - 1996 - 1997;
• Nexia KLETN - 1995 - 1997;
• Espero sedan KLEJ - 1997 - 1999.

Since the Daewoo Nexia was produced in Korea, Uzbekistan, Romania, Egypt and Vietnam, different names were assigned to the car by different manufacturers - Pointer, Racer, Lemans, Cielo and Chevrolet Nexia. In addition to sedans, the characteristics of the G15MF engine made it possible to put it on three-door and five-door hatchbacks, similar to the Opel Kaddet E.

Service Schedule G15MF 1.5L/75L. with.

Despite the declared resource of 250,000 km, the manufacturer recommends servicing the G15MF engine during maintenance according to the following schedule:

Consumable or service operation	Time (year) or mileage (1000 km), whichever comes first
Timing drive	7/100
battery	2,5/40
Valve clearance adjustment	2/15
Checking and cleaning the crankcase ventilation	2/35
Attachment belts	4/50
Inspection and cleaning of the fuel line	2/40
Motor oil	1/10
Oil filter	2/20
air filter cartridge	2/40
Fuel filter	4/40
Checking and replacing heating/cooling hoses	3/30
Antifreeze	2/40
CO and oxygen sensor	10/100
Spark plug	1 – 2/20
exhaust tract	1/20

The classic ICE device allows you to reduce operating costs and the cost of overhaul.

Overview of faults and how to fix them

Due to the concave shape of the piston and the hole inside it, the G15MF motor does not bend the valve when the timing belt drive breaks. It has several faults:

The rest of the breakdowns inherent in all in-line engines with an overhead camshaft should be fixed in working order.

Motor tuning options

The high-resource G15MF engine can be improved by mechanical tuning of the following type:

• cylinder boring for the piston of the F16D3 engine mounted on the Lacetti;
• the use of a wide-phase camshaft from Opel Cadet;
• polishing the channels of the intake stroke and replacing the standard cartridge with a filter of zero resistance;
• ECU firmware up to version P9F0CO.

If tuning by installing a supercharger is necessary, the pressure should be limited to 0.5 bar.

It is important to understand that tuning will add 30 liters. with. at best without loss of operational resource.

Thus, the G15MF motor conditionally refers to the "millionaires", is a reliable and unpretentious power drive, created specifically for the Daewoo Nexia in the image of the Opel Cadet engine.

If you have any questions - leave them in the comments below the article. We or our visitors will be happy to answer them.

Daewoo Nexia engine 8 valves with a volume of 1.5 liters has become one of the most popular on Daewoo Nexia in recent years of production. Today, there are quite a few cars on the secondary market with this motor. 80 hp unit (A15 SMS, the same engine is on the Chevrolet Lanos), this is a gasoline aspirated with multipoint fuel injection with an ignition coil, which replaced the engine of the series G15MF 1.5 liter developing 75 hp with an unreliable distributor.

Daewoo Nexia engine device 8 valves

Engine Nexia 1.5 l. gasoline, four-stroke, four-cylinder, in-line, eight-valve, with an overhead camshaft. The location in the engine compartment is transverse. The order of operation of the cylinders: 1-3-4-2, counting - from the auxiliary drive pulley. Power system - phased distributed fuel injection (Euro-3 toxicity standards). The motor has a cast iron cylinder block.

An engine with a gearbox and a clutch form a power unit - a single unit, fixed in the engine compartment on three elastic rubber-metal supports. The right support is attached to the bracket located on the front wall of the cylinder block, and the left and rear - to the gearbox housing.

Cylinder head of Daewoo Nexia engine 8 cells.

Nexia cylinder head 8 valves are cast from aluminum alloy, common to all four cylinders. The head is centered on the block with two bushings and fastened with ten bolts. A gasket is installed between the block and the cylinder head.

On opposite sides of the cylinder head are the intake and exhaust ports. Seats and valve guides are pressed into the cylinder head. The valve closes under the action of one spring. Its lower end rests on a washer, and its upper end rests on a plate held by two crackers. The crackers folded together have the shape of a truncated cone, and on their inner surface there are beads that enter the grooves on the valve stem. Actuates the valves on the camshaft. The cast iron camshaft rotates on five supports (bearings) in an aluminum bearing housing that is attached to the top of the cylinder head.

Timing drive engine Nexia 1.5 l.

The camshaft drive of the Nexia 8-valve engine is carried out by a toothed belt from the crankshaft. The valves are actuated by the camshaft cams through pressure levers, which are supported by one shoulder on the hydraulic clearance compensators, and by the other shoulder through the guide washers - on the valve stems.
The engine has hydraulic lifters, which are self-adjusting pressure lever supports. Under the influence of oil filling under pressure the internal cavity of the compensator, the compensator plunger selects the clearance in the valve actuator. The use of hydraulic compensators in the valve drive reduces the noise of the gas distribution mechanism, and also eliminates its maintenance.

If the valve belt breaks, it bends! Among other features, it can be noted that the timing belt rotates the pump (water pump). The belt is replaced every 60 thousand kilometers, the pump must be changed every 120 thousand kilometers. Please note that on the old 8-valve 75 hp engine. The timing belt generally changes every 40 thousand kilometers.

Characteristics of the Nexia engine 8 valves 80 hp

• Working volume - 1498 cm3
• Number of cylinders - 4
• Number of valves - 8
• Cylinder diameter - 76.5 mm
• Stroke - 81.5 mm
• Timing drive - belt
• HP power - 80 at 5600 rpm. in min.
• Torque - 123 Nm at 3200 rpm. in min.
• Maximum speed - 175 km / h
• Acceleration to the first hundred - 12.5 seconds
• Fuel type - gasoline AI-92
• Fuel consumption in the city - 8.5 liters
• Combined fuel consumption - 8 liters
• Fuel consumption on the highway - 7.7 liters

Pretty reliable and unpretentious motor, the main thing is to change the oil, timing belt, pump in time. Completely repairable power unit. For a budget car the best option.

The F16D3 engine was installed on the Nexia after 2008. Nexia with this engine has become very dynamic, because the engine has a volume of 1.6 and 16 valves. In Daewoo, this engine is called DOHC.

Initially, the engine was marked F14D3 with a volume of only 1.4 liters. After modernization at the GM plant, the F16D3 engine and its subsequent modifications were born. In turn, the F14D3 is a continuation of the Opel engine Z16XE (2001), everything is interchangeable with this engine. The next and last modification of the F16D4 engine - phase regulators were added to it and boosted, it has a volume of 125 horsepower compared to 109 horsepower on its predecessor.

Technical characteristics of the F16D3 engine from Daewoo Nexia

The approximate resource of the engine is 220 - 250 thousand kilometers. In fact, this motor is considered a millionaire, it all depends on the maintenance of the motor, as well as on the conditions of its operation.

It is worth noting that if the timing belt breaks on this engine, the valves will bend. During a valve break, collide with the pistons and the higher the crankshaft speed at this moment, the greater the damage.

The engine is installed - Chevrolet Cruze, Daewoo Lanos, Chevrolet Lanos, Daewoo Nexia, Chevrolet Aveo, Chevrolet Lacetti, Daewoo Lacetti, ZAZ Chance, Chevrolet Nexia. The power of 109 horsepower very quickly accelerates such a light car as a Daewoo Nexia.

Typical engine malfunctions F16D3 on Nexia

The F16D3 engine is equipped with an EGR valve - an exhaust gas recirculation system. Exhaust gases re-enter the intake tract and burn out. This was done to reduce toxicity standards, but because of this, the oil loses its properties faster and soot forms on the valves. The engine essentially breathes its own exhaust. For Nexia, we wrote how to turn off the USR valve, but this instruction will help other owners of this engine. Also, this valve quickly clogs itself from low-quality fuel and clogs the engine, so we recommend turning it off.

Also, a typical problem with this engine is oil leakage from under the valve roof (cylinder head cover). We also already wrote how to eliminate oil leakage from under the valve cover on the Nexia.

With a lack of oil, valves and hydraulic lifters begin to click. If you give a load with no oil, then the engine can be sent to the trash.

F16D3 engine tuning

We devoted a whole section about tuning on Nexia. To increase the amount of horsepower, you need to flash the engine, but the firmware gives a maximum of 5-8 hp. to get a significant increase, you need to put a 4-2-1 spider. The new release increases to 125 horsepower.

The simplest and most effective way to improve vehicle dynamics and reduce fuel consumption is to remove the catalyst and change the exhaust. The catalyst and standard exhaust strongly choke the engine and prevent it from working at normal strength. This is the most affordable type of tuning.

The Daewoo Nexia car in Russia at one time gained extraordinary popularity, but these cars can still be constantly seen on the roads of our country.

This brand has long been the best-selling brand in the Russian Federation, and Nexia is still in good demand.

A bit from the history of Daewoo Nexia

The progenitor of the Daewoo Nexia car was the well-known Opel Cadet E, which was produced by a German company from 1984 to 1991. At first, Nexia was produced in Korea under the name Daewoo Racer, and its release continued until 1995. For some time, the SKD assembly of the Nexia was carried out in Krasny Askai, Rostov Region, but in 1998 the production of the car was discontinued.

The main production of Daewoo Nexia was established in Uzbekistan in the city of Asaka, the first cars rolled off the assembly line in 1996. Almost immediately, the car began to be exported to Russia, and in 2008 Nexia underwent a slight restyling:

• new headlights appeared;
• changed bumper;
• became another trunk lid;
• rear lights changed.

There were still very minor external changes, but in general the car remained recognizable and differed from the pre-styling Nexia a little.

The first Uzbek "Nexia" came in two trim levels:

• GL - basic version;
• GLE - luxury option.

The basic equipment was very simple, sometimes it did not even provide for a power steering. In the GLE version, the car was equipped with additional options:

• power windows;
• hydraulic power steering;
• air conditioning;
• fog lights;
• electrical antenna.

At first, the Daewoo Nexia powertrain lineup included one single 1.5-liter gasoline engine. The motor had a power of 75 liters. with., in-line arrangement of four cylinders.

The G15MF engine is 8 valves, one intake and one exhaust valve per cylinder, in many ways it is very similar to the Opel C16NZ internal combustion engine. Despite the apparent resemblance, Opel and Nexia engines have significant differences, and on the G15MF engine:

• a different diameter of the cylinders, respectively, the pistons have a completely different configuration and dimensions;
• another ebb is made on the crankshaft for the oil pump drive;
• the oil pump itself has a different drive configuration;
• in the cylinder head, instead of a plug, a metal fitting is pressed in at the back for the cooling system pipe, in addition, the combustion chambers are slightly different in the cylinder head.

There are still a number of design differences that do not allow parts from the C16NZ engine to be installed on the G15MF engine. In particular, Nexia has its own distributor, and it does not fit from any Opel.

The Daewoo Nexia 1.5 engine has the following characteristics:

• type of fuel system - distributed injection;
• location on the car - transverse;
• volume - 1498 cm³;
• number of valves - 8;
• cylinder diameter - 76.5 mm;
• piston stroke - 81.5 mm;
• diameter of the crankshaft main journals - 55 mm;
• the diameter of the connecting rod journals is 43 mm.

Despite the fact that the Daewoo Nexia 1.5 engine has 8 valves, a car with it can reach a fairly decent speed (up to 175 km / h) and accelerate to 100 kilometers in 12.5 seconds. In urban mode, fuel consumption with the G15MF engine averages 9.3 liters per 100 kilometers, on the highway outside the city - 7 l / 100 km, with dynamic driving, gasoline consumption increases.

The 8-valve Nexia engine is very reliable, and if you take care of it properly (do not overheat, do not overload, change engine oil on time), then the engine can run more than 200 thousand kilometers without major repairs. It should be noted that some car owners did not spare the engine at all:

• they poured the cheapest surrogate oil into it;
• forgot to change the oil on time;
• did not check the oil level in the crankcase.

If you remove the oil filler cap from such a “killed” engine, you can immediately see blackness on the camshaft, which is formed from low-quality oil. Nevertheless, even such motors miraculously "survived", and this indicates how reliable they are.

In 2002, some changes were made to the Daewoo Nexia, although it is difficult to call them restyling. But the most important novelty of this year is the appearance in the line of power units of a new 16-valve A15MF engine with a volume of 1.5 liters and a power of 85 hp. with.

The main difference between this engine and the 8-valve one is a completely different cylinder head, in which two camshafts are installed. There is no longer a distributor in the power unit, the electronic unit controls the ignition. The diameter of the cylinders remained the same, but the pistons changed - four grooves under the valves appeared on the bottom. To be honest, the grooves on the pistons do not play a special role - when the timing belt breaks, the valves bend. The G15MF 8-valve internal combustion engine wins in this regard; a broken timing belt on it does not damage the engine.

As for the crankshaft, it remained the same, the interchangeability of the A15MF and G15MF crankshafts is complete. Also, the changes did not affect the oil pump, engine sump, flywheel and clutch. In connection with the installation of a more advanced ignition system on the Nexia with a 16-valve engine, fuel consumption has slightly decreased:

• in the urban cycle - 9.3 l / 100 km;
• on the highway outside the city - 6.5 l / 100 km.

New engines 2008

In 2008, in addition to external changes in the body, the Daewoo Nexia updated the engine line:

• instead of the obsolete G15MF engine, the A15SMS ICE was installed. This power unit uses a fuel system from Chevrolet Lanos, the engine began to meet Euro-3 environmental standards;
• the 16-valve A15MF 1.5-liter engine was replaced by a new ICE model F16D3, with a volume of 1.6 liters.

The A15SMS motor has become "stronger" than its predecessor, its power has increased to 89 hp. s., but it also has one “fat” minus - due to the fact that the cylinder head of the new engine is installed from Lanos, when the timing belt breaks, now the valves “meet” the pistons.

Since 2008, a new 16-valve F16D3 engine has been installed on the Daewoo Nexia car, which meets the environmental requirements of Euro 3 and 4, first this engine appeared on the Chevrolet Lacetti. Also, the Chevrolet Cruze model was equipped with the F16D3 engine, the Opel X14XE power unit served as the prototype of the motor. Although the volumes of these motors are different, they are structurally and externally very similar to each other. Both engines have:

• timing belt drive;
• hydraulic compensators;
• two camshafts;
• exhaust gas recirculation system.

The F16D3 gasoline engine has the following technical specifications:

• number / arrangement of cylinders - four, in-line;
• volume - 1598 cm³;
• power - 109 hp;
• fuel system - distributed injection;
• compression ratio in the cylinders - 9.5;
• cylinder diameter - 79 mm;
• piston stroke - 81.5 mm.

To reduce the toxicity of exhaust gases, an EGR valve is installed on this engine, but the recirculation system often cokes from Russian gasoline, and many car owners turn off this valve. The F16D3 engine is not just similar to the X14XE, it also adopted all the diseases from the Opel power unit:

• quick failure of the lambda probe (also due to low-quality fuel);
• oil leak from the valve cover;
• problems with a thermostat that opens too soon.

The leak would not cause much trouble if the oil did not flow into the candle wells. Penetrating into the well, the oil gets on the electrodes of the spark plug, and the internal combustion engine starts to triple. But on the Daewoo Nexia 1.6 engine, oil is rarely consumed through piston rings, in this regard the motor is reliable.

Like any other car, Daewoo Nexia needs maintenance, and engine oil needs to be changed according to the established regulations. The frequency of oil changes on Nexia engines is generally the same as on other models of passenger cars - every 10 thousand kilometers. If the operating conditions are difficult (high loads, work in a hot climate), it is recommended to change the oil after 5 thousand km.

The requirements for engine oils on Nexia are standard, there are no special conditions for them. So that the oil does not burn and blackness does not form on the parts inside the engine, it must be of high quality, with good additives. It is not recommended to pour mineral oil into engines; it is better to use “synthetics” or “semi-synthetics”.

For winter engine oil, the viscosity should be lower, according to the SAE classification for frosty winters, it is good to use grades 5W30, 0W30, 5W40, 0W40. On thick engine oil, when starting in frost, intensive wear of engine parts occurs, the motor resource is reduced, so multigrade oil should not be used for internal combustion engines in winter.

It is recommended to fill in almost any oil from well-known world manufacturers, the main thing is that it is not a fake. Often Daewoo Nexia engines use oil from companies:

• Castrol;
• Mobil;
• Chevron

It has long been proven that it is fake oil that is the cause of soot formation, reducing engine life. The secret here is very simple - the fake does not contain those high-quality additives that have the necessary lubricating properties and reduce friction between rubbing parts.

If "synthetics" for the car owner turns out to be too expensive, you can replace it with semi-synthetic oil, no big trouble will happen. But when replacing synthetic oil with "semi-synthetics", it is necessary to thoroughly flush the oil system before pouring new oil into the Daewoo Nexia engine.

Daewoo Nexia is one of the few cars that have been on domestic roads for over 20 years. Its prototype was the popular sedan Opel Kadett modernized in 1995. Over the years, the Nexia DEU engine was represented by models:

Specifications F16D3

PARAMETER	MEANING
Volume of cylinders, cu. cm.	1598
Power, l. s / about. in min.	106/6000
Torque, Nm/rev. per minute	142/4000
Number of cylinders	4
Valves per cylinder	4
Cylinder diameter, mm	79
Piston stroke, mm	81.5
Compression ratio	9.5
Supply system	Distributed fuel injection with electronic control
Gas distribution mechanism	DOHC 16V
Fuel	Unleaded gasoline A-95
Fuel consumption, l/100 km (city)	7.3
Lubrication system	Combined (spray + under pressure)
Engine oil type	Quality level SG/CC or higher: SAE 5W-30, 10W-40, 15w-40
Engine oil volume	3.75 l
Cooling system	Closed type with forced coolant circulation
Coolant	Based on ethylene glycol
Environmental regulations	EURO - 3

The F16D3 engine was installed on Daewoo Lanos, Nexia, Lacetti cars; ; ZAZ Chance.

Description

All power units that have ever been installed on a Nexia DEU are a classic four-stroke internal combustion engine with 4 cylinders arranged in one row.

The design of the cylinder block is identical. Their lubrication and cooling systems are also built according to the same scheme.

Initially, only the G15MF engine was installed on the Daewoo Nexia, which practically copied the Opel Kadett E engine, but instead of a carburetor, it used a distributed injection system with the simultaneous activation of all nozzles.

The gas distribution mechanism (GRM) was made according to a single-shaft scheme (SOHC 8V) with an overhead camshaft. There was also no catalytic converter and lambda probe.

Subsequently, the number of valves was increased to 16 and a two-shaft timing was used. In addition, the ignition system has been fundamentally changed. The motor after these changes significantly increased power and was labeled A15MF.

In addition, both power units began to be equipped with a lambda probe and a catalytic converter, which allowed them to comply with the requirements of the EURO - 2 standard.

In connection with the introduction of the EURO-3 environmental standard, the Nexia Daewoo engines (G15MF, A15MF) were discontinued and replaced by A15SMS and F16D3 engines:

• A15SMS

It is the fruit of further modernization of the base G15MF engine, in which a number of changes have been made to improve environmental performance:

1. the number of information elements of the engine management system has been increased, including sensors: camshaft position and detonation;
2. instead of the ignition distributor sensor, the ignition module is used;
3. the geometry of the inlet pipeline has been changed;
4. two catalytic converters of exhaust gases are mounted;
5. two oxygen concentration sensors are installed.

• F16D3

An upgraded version of the F14D3 engine with a twin-shaft 16-valve timing belt DOHC 16V overhead and a CVCV (Continuonus Variable Camshaft phasing) phase control system. The engine is also equipped with an electronic exhaust gas recirculation (EGR) control system.

The new b15d2 power unit differs from the rest in a more efficient engine control unit, a redesigned ignition coil, etc. All this, along with the use of an improved timing belt with a chain drive and electronic control of variable valve timing, has significantly increased power and reliability, as well as improved a number of technical motor characteristics.

Maintenance

Maintenance of engines that were installed on Daewoo Nexia is carried out in accordance with the maintenance plan.

True, if the car is operated in harsh driving conditions (dust, off-road, extreme driving, etc.), then it is advisable to carry out maintenance more often.

During scheduled maintenance of the car, it is recommended to monitor the condition of the power unit. At the same time, it is mandatory to carry out:

• replacement of engine oil;
• checking the tightness of all hoses, pipes and pipelines;
• control of the tightening torque of the cylinder head bolts;
• diagnostics of the electronic control system of the power unit;
• replacement of filters (oil and fuel);
• inspection of the air filter and, if necessary, its cleaning or replacement.

An important place in this list is occupied by a responsible (but simple) engine oil change procedure, which can be performed both at a service station and on your own.

Its peculiarity lies in the fact that, for example, changing the Matiz oil is no different from changing the oil of any other Daewoo brand car. It is only important to determine where they are located:

• oil filler neck;
• drainer;
• oil filter.

The volume of oil to be filled into a particular engine is indicated in the technical or reference documentation.

In addition, during maintenance after each:

1. 30 thousand kilometers or 1 time in 3 years, it is necessary to replace the air filter;
2. 40 thousand km or 1 time in 4 years they replace: coolant and brake fluid; replacement of the drive belt and timing rollers.

Note: in the b15d2 engine, the timing chain is changed only if it is overstretched.

Faults

The engines installed on Daewoo Nexia vehicles have a number of characteristic faults (disadvantages). Among them:

FAULTS	CAUSES	SOLUTIONS
High oil consumption	Oil leak from the engine. Broken or worn piston rings. Dirty or worn oil pump.	Tighten bolts and/or replace sealing elements. Replace defective piston rings. Replace oil pump.
Momentary knocking in the engine immediately after starting.	Malfunction of hydraulic pushers of timing valves. Increased axial clearance of the crankshaft. Increased clearance in the front main bearing.	Check, clean and, if necessary, replace the tappets. Replace shaft bearing. Replace worn parts.
Loud knocking sound on warm engine.	Loose torque converter mounting bolts. Tightened drive belts. Increased clearances in main bearings.	Tighten the bolts. Adjust the tension belts or replace them with serviceable ones. Replace main bearing shells.

Other malfunctions may occur in Nexia engines, which are best fixed in service stations.

tuning

Serious tuning of the engines of the Daewoo Nexia is carried out infrequently. This is largely due to the high complexity of the work on the manufacture and installation of new parts and assemblies. Necessary:

1. Install camshafts with high valve lift.
2. Sand the intake manifold.
3. Boring cylinders for large piston sizes.
4. Install the supercharger (compressor) and controller.
5. Install a large capacity exhaust manifold and straight-through muffler.
6. In addition, we need forged pistons and connecting rods, a lightweight flywheel, a more powerful timing, etc.

After completing the work, it is necessary to reflash the electronic engine control unit. Proper reconfiguration of the electronics in the presence of an installed supercharger will increase the power of the atmospheric motor from 10 to 25%, while increasing the torque by 10 - 20%.