The engine cylinders are cast from gray cast iron in one piece with the cylinder block. The cylinder heads are made of light alloy and are bolted to the cylinder block. Steel guide bushings and valve seats are pressed into the cylinder head. An oil pan is attached to the bottom of the engine block, into which oil flows, which is necessary for lubricating and cooling the engine.
The engines use a cross-flow arrangement in which the air-fuel mixture enters the engine cylinders from one side of the engine and the exhaust gases are expelled from the other side of the engine. With this design, the filling of the cylinders with an air-fuel mixture and the removal of combustion products are significantly improved.
Each cylinder has two intake and two exhaust valves. A separate cylinder head with two camshafts is installed on each section of the cylinder block. One camshaft controls the intake valves, the other controls the exhaust. The camshafts that control the exhaust valves are driven by a single toothed belt. The camshaft that controls the intake valves is driven by the camshaft that controls the exhaust valves.
Valve clearances are automatically adjusted using hydraulic tappets, so manual adjustment is not required.
To supply oil to the rubbing surfaces of the engine, an oil pump driven by a crankshaft is used. Under pressure, oil is fed through channels to the bearings of the crankshaft and camshaft.
The water pump is located at the front of the engine and is driven by a toothed belt. Keep in mind that engine cooling system must be filled all year round with a mixture of antifreeze and water with a low lime content.
The preparation and ignition of the air-fuel mixture in the engine cylinders is carried out by the engine control system, which does not require adjustments during operation. The ignition timing and idle speed are controlled by the engine management system. During maintenance, the spark plugs and air filter element must be replaced.
Warning: The radiator fan may come on after the engine is stopped and the ignition is turned off, so be careful when working on a hot engine. To prevent the radiator fan from turning on, disconnect the electrical connector from the radiator fan motor.
Technical data
cylinder head
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Deviation from the flatness of the mating surface of the cylinder head, mm
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0,1
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Timing belt shock absorber length, mm:
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on a cold engine
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136–139
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on a hot engine
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126–129
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Camshaft
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Maximum axial clearance of the camshaft, mm
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0,15
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The minimum allowable distance from the end of the valve to the upper surface of the cylinder head, mm:
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ABZ engine:
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intake valves
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36
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exhaust valves
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36,3
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AEW engine:
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intake valves
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36,4
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exhaust valves
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36,4
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AHC motor:
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intake valves
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25,7
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exhaust valves
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36,4
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Tightening torques* of main threaded connections, Н·м
Torque converter to drive disc:
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engine code ABZ
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35
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engine code AEW
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85
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Front right engine bracket
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45
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Generator to engine:
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M10
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40
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M8
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25
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Crankshaft Pulley Bolt:
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without special tool 2079
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450
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with special tool 2079
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350
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Exhaust manifold to cylinder head
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25
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A/C compressor to bracket
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25
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air conditioner bracket
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25
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Exhaust pipe to manifold
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40
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Front right engine bracket
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45
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Lower frame to body
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65 + tighten by 180°
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Bolts of fastening of an oscillation damper to a pulley of a cranked shaft
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25
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Toothed belt tensioner pulley
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25
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Bolt of fastening of a pulley of a camshaft
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55
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Bolt of fastening of a rotor of the gauge to a back part of a head of the block of cylinders
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20
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Bolts of fastening of a head of the block of cylinders:
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stage 1
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tighten torque 40
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stage 2
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tighten torque 60
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stage 3
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tighten by 180°
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Camshaft bearing cap
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15
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Bolts of fastening of a casing of a gear belt
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10
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* For other threaded connections, the tightening torques are as follows, Н·м: M6 - 10; M8 - 20; M10 - 45; M12 - 65.
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