ADJUSTMENT YAMZ ENGINES-7511.10, YAMZ-7512.10, I AMMZ-7513.10, YaMZ-7601.10
BELT TENSION ADJUSTMENT
The drive of the water pump, compressor and generator is carried out by V-belts, on the reliable operation of which the normal operation of these units depends. Therefore, during daily maintenance of engines, protect belts from oil and fuel, control their tension and adjust it. Especially carefully check the tension of the belts during the first 50 hours of engine operation, since during this time they are at their greatest stretch. The tension of the belts should always be normal, since both excessive and insufficient tension will lead to premature failure of them. In addition, over-tensioning the water pump drive belt can damage the pump bearings.
A normally tensioned water pump belt, when pressed on the middle of a long branch with a force of 40 N (4 kgf), bends by 10… 15 mm (Fig. 44), and the compressor belt - by 4… 8 mm on a short branch (Fig. 45). Check the tension of the alternator drive belts by pressing with a force of 40 N (4 kgf) on the middle of the branch of each belt (Fig. 46), while the alternator drive belts should bend by 10 ... 15 mm. If the belts deflect more or less than specified, adjust their tension.
Adjust the tension of the water pump belt (Fig. 44) with the tensioner, for which:
loosen the bolts of the tensioner arm arm;
tension the belt using a Ø12 mm wrench inserted into the hole in the arm of the tensioner;
without weakening the tension force, tighten the bolts of the tensioner arm arm;
check belt tension.
Rice. 44. Checking the tension of the water pump belt
Rice. 45. Checking the tension of the compressor belt
Rice. 46. Checking the tension of the alternator belt
Adjust the tension of the compressor belt with the tensioner. Before adjusting, loosen the locknut one turn, the nut securing the axle of the tensioner pulley by half a turn and the nut of the tensioner bolt two turns.
Turning the tensioning bolt, adjust the belt tension. After adjustment, tighten the nut and locknut of the axle to a torque of 120 ... 150 Nm (12 ... 15 kgfm) and the nut of the tensioner bolt
on the head of the right row of cylinders of the rocker arm of the exhaust valves to the end of the axle, of the intake valves to the thrust washer;
on the head of the left row of cylinders of the rocker arm of the exhaust valves to the thrust washer, inlet valves
- to the end of the axis.
The exhaust valves of the right bank of cylinders are located closer to the fan, the left bank of cylinders is closer to the flywheel.
Adjustment sequence:
Rice. 48. Cranking the crankshaft
Rice. 49. Adjustment of the valve mechanism clearance
To adjust the gaps, unscrew the nut of the adjusting screw, insert a dipstick into the gap and, turning the screw with a screwdriver (Fig. 49), set the gap 0.25 ... 0.30 mm. Hold the screw with a screwdriver, tighten the nut and check the clearance. When properly adjusted
the gap, the 0.25 mm thick stylus should enter with light pressure, 0.30 mm thick - with effort.
To adjust the valve train clearances of the remaining cylinders, turn the crankshaft in the same direction until the intake valve of the controlled cylinder is completely closed and additionally by another 1/3 turn. Adjust the clearances as described above (see item 6).
After completing the clearance adjustment, start the engine and listen to its operation. There should be no knocks in the valve mechanism. If there is a characteristic knock of the valves, stop the engine and repeat the clearance adjustment.
Install and secure the cylinder head covers, check the condition of the gaskets. Oil should not leak in the place where the covers fit.
CHECKING AND ADJUSTMENT OF THE FUEL INJECTION ADJUSTMENT YAMZ ENGINES-7511.10, YAMZ-7512.10, I AMMZ-7513.10, YaMZ-7601.10
To adjust the fuel injection advance angle, there are two hatches on the flywheel housing (see Fig. 50), and the values of the angles are marked on the flywheel in two places. For the lower indicator 3, these values are made on the flywheel in numerical terms, and for the side indicator 4 in literal terms, while the letter "A" corresponds to a numerical value of 20 °; letter "B" -15 °; the letter "B" -10 °; the letter "Г" -5 °.
Rotate the engine crankshaft clockwise (as viewed from the fan side) until the marks on the crankshaft pulley and the timing gear cover or on the flywheel are aligned with the pointer corresponding to the setting angle of the fuel injection advance - 6º… 7º. In this case, the valves in the 1st cylinder must be closed.
Rice. 50. Alignment of marks on the flywheel with indicators of the flywheel housing:
1 – flywheel housing; 2 – flywheel; 3, 4 - flywheel housing indicators; 5 – top hatch plug; A - direction of rotation of the crankshaft
You can rotate the crankshaft with a wrench for the crankshaft pulley mounting bolt or with a crowbar for the holes in the flywheel (Fig. 48) with the flywheel housing hatch cover removed.
At the moment of aligning the marks, the mark should be aligned
"A" at the end of the coupling (Fig. 50, 51) with a line "B" on the index. If the marks are not aligned, it is necessary to make adjustments.
The procedure for adjusting the injection advance angle (Fig. 51):
without knocking down the aligned position of the marks, tighten the terminal connection bolt to a torque of 16 ... 18 kgf · m. In this case, the deviation of the plate package from the position in one plane should be within ± 1 mm. Measurement should be made near the places where the plates are attached. If corrugations appear on plates 4, they are removed by alternately loosening and then tightening with a torque of 11 ... 12.5 kgf · m of four bolts 5 for fastening the plates to the flange of the half-coupling and to the damper coupling;
..
torque of 10 ... 20 N · m (1 ... 2 kgf · m), with a larger tightening torque, the adjustment will be violated due to the movement of the pulley axis.
Adjust the tension of the alternator drive belt by moving the alternator relative to the axis of its attachment. Before adjusting, loosen the tightening of the generator mounting bolts, the generator rail mounting nuts and the generator to the rail mounting bolt. After adjustment, secure the generator securely. With an increased draft and breakage of at least one of the alternator drive belts, replace both belts with a set to ensure an even load on them.
CYLINDER HEAD REINFORCEMENT YAMZ ENGINES-7511.10, YAMZ-7512.10, I AMMZ-7513.10, YaMZ-7601.10
Rice. 47. The order of tightening the nuts securing the cylinder heads:
a) - a common head for four cylinders; b) - a common head for three cylinders; c) - individual cylinder head.
Check the tightening torque of the cylinder head fastening nuts with a torque wrench in the cold state of the engine and, if necessary, tighten them to a torque of 235 ... 255 N. m (24 ... 26 kgf . m).
Tighten the nuts in the sequence shown in fig. 47 in ascending order of numbers.
ATTENTION ! IT IS STRICTLY FORBIDDEN TO TIGHTEN THE NUTS TO A LARGER TORQUE THAT IS INDICATED, BECAUSE THIS WILL LEAD TO THE BREAKING OF THE PINS AND BREAKING THE CYLINDER HEADS, AND THE TIGHTNESS OF THE CONNECTION WILL NOT RESTORE.
ATTENTION ! WHEN INSTALLING THE CYLINDER HEAD ON THE ENGINE OR SIGNIFICANT LOOSE OF TIGHTENING, TIGHTEN THE NUTS AT LEAST THREE STEP (SEE REPAIR SECTION)
After tightening the cylinder head nuts, adjust the thermal clearances in the valve train and install the cylinder head covers.
VALVE CLEARANCE ADJUSTMENT YAMZ ENGINES-7511.10, YAMZ-7512.10, I AMMZ-7513.10, YaMZ-7601.10
Thermal clearances in the valve mechanism are designed to ensure a tight fit of the valve on the seat when expanding the valve drive parts during engine operation. The value of the thermal clearance at the inlet and outlet valves is set the same and is adjustable within 0.25 ... 0.30 mm. When re-checking the gaps after scrolling the crankshaft of the adjusted engine, it is possible to change them to the limits of 0.20 ... 0.35 mm due to the error in the shape and location of the surfaces of the parts of the gas distribution mechanism, which is permissible.
If the thermal gaps are too large, the valve lift decreases, as a result of which filling and cleaning of the cylinders deteriorates, shock loads increase and the wear of the gas distribution mechanism parts increases. With very small gaps, as a result of thermal expansion of the parts of the gas distribution mechanism, it is not ensured
tight fit of the valves to the seats, gas-dynamic processes in the engine cylinders are disrupted, the power and technical and economic indicators of the engine deteriorate. In addition, a decrease in the clearance in the exhaust valve actuator can lead to overheating of the valves and their burnout.
Adjust the thermal clearances on a cold engine or not earlier than 1 hour after stopping it.
When adjusting the thermal clearances and re-checking them, the rocker arms are recommended to press down:
loosen the tightening of bolt 2 of the terminal connection: flange 3 - driving half of the coupling 1;
by turning the damper coupling, align the indicated marks;
Rice. 51. High pressure fuel pump drive clutch:
1 – leading half-coupling; 2 – bolt of terminal connection; 3 – half-coupling flange; 4 – drive plates; 5 – bolts of fastening of drive plates; 6 – washers; 7 – damper clutch; 8 – pointer; 9– high pressure fuel pump; А –mark on the damper clutch; B-mark on the index
The YaMZ-7511 engine has been produced by the Yaroslavl Motor Plant since 1996. It is intended for installation on MAZ vehicles. A new generation of 8-cylinder diesel engines of the D x S = 130 x 140 mm family - YaMZ-7511 and its modifications - with a capacity of 360-420 hp. meets the basic technical and economic requirements for modern automotive technology. All models have successfully passed certification tests, which is confirmed by international certificates of compliance with environmental standards Euro-2. At the same time, design and research work is underway to achieve more stringent Euro-3 standards. The promising engines of this family have a wide range of potential consumers, including the largest manufacturers of cars, long-haul road trains, tractors and other equipment in Russia. Belarus, Ukraine.
Design features: The engine is equipped with fuel equipment of the "Compact-40" type with increased injection energy up to 1200 kg / cm2, fan clutch, crankshaft torsional vibration damper, improved characteristics of inlet and outlet channels. The engine has a built-in liquid-oil heat exchanger, a new cylinder-piston group with a more efficient oil cooling system, a water pump with increased productivity, an upgraded oil filtration system, etc. It is designed for the installation of an air-to-air charge air cooler on a vehicle.
Engines YaMZ-7511.10, YaMZ-7511.10-06, YaMZ-7512.10 are four-stroke, with compression ignition, with a V-shaped arrangement of cylinders and gas turbine supercharging.
Number of cylinders: 8
Cylinder diameter, mm: 130
Piston stroke, mm: 140
Working volume of cylinders, l: 14.86
Compression ratio: 16.5
Engine speed at rated power min -1: 1900 (+50, -20)
Crankshaft rotation frequency at maximum torque, min -1, not more: 1100-1300
Engine idling speed, min:
minimum: 550-650
maximum, not more: 2150
Weight of the unfilled engine in the scope of delivery, kg:
a) with individual cylinder heads
without clutch: 1250
with clutch: 1295
a) with common cylinder heads
without clutch: 1215
with clutch: 1260
SPECIFICATIONS
Mixing method: Direct injection.
Fuel supply equipment: Divided.
High pressure fuel pump: Eight-plunger.
Speed controller: Centrifugal, all-mode with boost corrector.
Injectors: Closed, with a multi-hole spray.
Turbocharger 12.1118010: Radial centripetal turbine; centrifugal compressor.
Lubrication system: Mixed: under pressure and spray, with oil cooling in a liquid-oil heat exchanger. In addition, oil is supplied through a system of channels and pipelines for jet cooling of the pistons.
Oil filters: Two: full-flow with replaceable filter elements and centrifugal with a jet drive.
Oil pump: Single section, gear type.
Cooling system: Liquid, closed type, with forced circulation of the coolant; equipped with a thermostatic device.
Starting device: Starter 2501.3708-01, direct current, sequential excitation with an electromagnetic drive. Rated power 8.2 kW (11 HP), rated voltage 24 V.
Starting aid: Electric torch device.
Generator 6582.3701-03: Alternating current with a belt double-strand drive, rated voltage 28 V, with built-in voltage regulator, with a maximum load current of 80 A.
Clutch: YaMZ-184. Diaphragm, single-disk, pull-out type.
Transmission: It is possible to install gearboxes manufactured according to the dimensional code No. 1 ISO 7648 (SAE No. 1), or others as agreed with the customer.
- engine model developed and assembled by Avtodizel OJSC (Yaroslavl Motor Plant). YaMZ 7511.10 from the family of eight-cylinder V-shaped four-stroke diesel engines is designed for use on the MZKT-065272 chassis, on the MZKT-74181 truck tractors.
YaMZ 7511.10 is a further development and modernization of eight-cylinder V-shaped engines of the YaMZ plant. In fact, the YaMZ 7511.10 is a forced version of the YaMZ-238DE2 engine, in which the power has been significantly increased. Distinctive features of the YaMZ - 7511.10 model range are a built-in liquid-oil heat exchanger, a new sleeve-piston group with an improved oil cooling system, a water pump with increased productivity and an improved injection pump. This diesel engine model is designed to use a charge air unit that is attached to the product frame. In addition to excellent specific characteristics and a good power range, this series of engines is reliable in operation, durable, has excellent maintainability and can be operated in extreme environmental conditions at temperatures from -50 to + 50 ° C.
Engines of the Yaroslavl Motor Plant are a reasonable price, high reliability and quality assurance.
YaMZ 7511.10 engine- four-stroke, 8-cylinder, V-shaped arrangement of cylinders, working volume 14.866 cm 3, liquid cooling, direct fuel injection, mechanical speed controller, turbocharged, complies with Euro-2 environmental emission standards. Diesel engines YaMZ 7511.10 can be equipped with a clutch YaMZ-184 and gearboxes YaMZ-239, the resource before overhaul of the engine is 10,000 hours.
Main technical characteristics of YaMZ-7511.10 and its modifications
Modification of the YaMZ-7511.10-01 engine equipped with TKR-9, ZhMT, fan clutch, individual block and cylinder head, water pump with increased productivity, high-pressure fuel pump 12/14 and its drive, torsional vibration damper, front support, generator 6582.3701-03 (2 kW), impeller a fan with a diameter of 660 mm, a flywheel for a diaphragm clutch with additional marks and a flywheel mount, a YaMZ-184 clutch, a YaMZ-239 gearbox. The engine model is operated on the MZKT-65272 chassis.
Modification of the YaMZ-7511.10-06 engine assembled on the basis of YMZ-7511.10-01 and equipped with a YMZ-184-10 clutch with a set of parts for the clutch release clutch. This engine modification is used on the MZTK-8021, -80211 chassis, on the MZTK-74181 truck tractors and MAZ-533608, -630308, -631708, -543208, -544008, -642208, -640308, -641708, -630308, and also available as spare parts.
Modification of the YaMZ-7511.10-10 engine designed on the basis of YaMZ-7511.10-06, equipped with a clutch with PTO (184.420004), used on a rotary rotor snowplow KO-816-1.
Modification of the YaMZ-7511.10-11 engine assembled on the basis of YaMZ-7511.10-02, equipped with a flywheel housing with a spacer ring, a flywheel with a bearing, an oil level indicator, a YaMZ-184 clutch, a YaMZ-239 gearbox. This modification is used on the wheeled chassis BAZ-690990, -6909902.
Modification YaMZ-7511.10-12 has a YaMZ-7511.10-02 engine as a base, is equipped with an oil sump without a shell, an oil level indicator, a right exhaust manifold, a fuel drain pipe from injectors with a union at an angle of 45 ° to the longitudinal axis of the engine, a fan clutch (238ND), a YaMZ clutch -184, gearbox YMZ-2391-01. The engine does not have a turbocharger mounting stud and is used on the chassis and dump trucks 8 × 4 Ural-6563.
Modification YaMZ-7511.10-16 It has a YaMZ-7511.10-02 engine as a base, is equipped with an oil sump without a shell, an oil level indicator, is not equipped with a gearbox and clutch. The modification is used on the KrAZ-7140N1S6 chassis and the KrAZ-6140TE truck tractor.
The YaMZ 7511 engine is the next generation of the legendary YaMZ 238 engine, which were produced by the Yaroslavl Motor Plant for MAZ vehicles. The main difference is the presence of turbocharging and an increase in environmental standards to Euro-2.
Specifications
The YaMZ 7511 motor devices are somewhat different from their predecessors. The designers have improved a number of components and assemblies, which made it possible not only to increase the power of the internal combustion engine, but also the service life. So, Constructive changes were made:
- A liquid-oil heat exchanger is installed.
- A water pump with increased productivity was installed.
- Improved liner-piston group with oil cooling system.
- Refurbishment of fuel high pressure fuel pumps.
Now we will consider the main technical characteristics that the YaMZ 7511 engine has:
| Name | Characteristic |
| Type of | Diesel, turbocharged diesel |
| Volume | 14.86 liters (14 860 cc) |
| Configuration, parameter | V-shaped |
| Number of cylinders | 8 |
| Number of valves | 16 |
| Econorm | Euro-2 |
| Cylinder diameter | 130 mm |
| Compression ratio | 16,5 |
| Cooling | Liquid |
| Valve mechanism | OHV |
| Block and head material | Cast iron |
| Resource | 800,000 - 1,000,000 km |
| Fuel | Diesel fuel |
| The order of the cylinders | 1-5-4-2-6-3-7-8 |
| Applicability | Onboard vehicles, chassis MAZ-533608-020, MAZ-533608-021, MAZ-533608-043, MAZ-630308-020, MAZ-630308-021, MAZ-630308-040, MAZ-631708-010, MAZ-631708- 020, MAZ-631708-030, MAZ-631708-041, MAZ-631708-061; truck tractors MAZ-543208-0204, MAZ-544008-030-020, MAZ-544008-030-021, MAZ-642208-020, MAZ-642208-022, MAZ-640308-020-010, MAZ-640308-020- 020; timber trucks, timber trucks MAZ-641708-220, MAZ-630308-226 |
Service
Serving the YaMZ 7511 engine is quite simple, since there are no special differences from servicing the older brother of the 238th. Each scheduled service should be carried out at intervals of 20,000-25,000 km. If you follow the instructions for maintenance and repair, then it is necessary to perform the following series of operations:
- Change of oil.
- Valve train adjustment.
- Replacing filters. So, depending on the modification of the engine, there may or may not be the following filter elements: a filter for fine and coarse oil purification, a filter element for coarse and fine fuel purification, an air filter, an ecofilter for exhaust.
- Cleaning injectors.
- High pressure fuel pump related adjustments.
- Other operations aimed at maintaining the power unit.
Repair manual
Engine problems are aware of themselves from time to time. Often, this is due to wear of the main components and assemblies or improper operation. Also, maintenance of the motor can be considered a very important factor.
- Fuel pump malfunctions associated with poor fuel quality in the CIS.
- Cooling system. This failure occurs due to mechanical wear of the components.
- The electrical circuit is imperfect.
- Wear of the piston group.
- Valve mechanism.
- Starter and alternator.
The most common question that motorists ask on the Internet is the tightening torque of the cylinder head. To tighten the cylinder head fasteners, there is a diagram that must be followed.
They should be tightened with the force provided by the manufacturer, which is - nuts of the cylinder head studs 240–260 (24–26) N · m (kgf · m).
If the cylinder head mounts are too tight, then motor malfunctions are possible, including breakdown and squeezing of the gasket.
Output
The YaMZ 7511 engine is a high-class and powerful modern engine, which during its service has proved that it is worthy of attention. High technical characteristics, power, as well as ease of maintenance and repair, made the YaMZ engine popular and beloved, both in Russia and abroad.
