Contents: Removal ↓ Installation ↓
Removal
On a car, this is done if it is not necessary to remove the engine itself to fix the problem, or if it is only necessary to remove carbon deposits from the surface of the combustion chamber and valves.
The sequence of operations is as follows:
- drain the coolant from the radiator and cylinder block;
- remove the air filter and close the carburetor neck with a technological plug;
- disconnect the wires from the battery, carburetor, spark plugs and coolant temperature gauge sensor;
- disconnect the air damper drive cable from the carburetor;
- key 67.7812.9514 (tubular end 21 mm) remove the spark plugs and coolant temperature sensor;
- disconnect the throttle actuator rods from the intermediate lever on the cylinder head cover and remove the cover;
- on the 2105 engine, first remove the upper protective cover of the camshaft belt drive;
- set the gearshift lever to neutral and turn the crankshaft clockwise until mark A (Fig. 11) on the camshaft pulley (sprocket) aligns with mark B on the bearing housing. This operation is necessary to ensure that the camshaft pulley (sprocket) is correctly positioned when installing the cylinder head on the engine;
- disconnect the hoses from the carburetor, intake pipe, from the outlet pipe of the cooling jacket of the cylinder head and from the pipe supplying liquid to the heater;
- disconnect the heater drain pipe mounting bracket, starter protective shield and muffler inlet pipe from the exhaust manifold.
It is better to leave the exhaust manifold and intake pipe on the head. It is more convenient to remove them later - when disassembling the cylinder head.
On engine 2105 remove spring 7 (see fig. 19) tension roller 4. Loosen the tension roller bracket mounting bolts, move it to the extreme left position and remove the belt from the camshaft pulley.
On engines 2101, 2103 loosen cap nut 5 (see fig. 63) chain tensioner, press the tensioner rod with a mounting blade and secure it with a cap nut. Remove the camshaft sprocket and lower the chain down, preventing it from slipping off the accessory drive shaft sprocket.
Loosen the bolts securing the cylinder head to the block and remove the head and the gasket located between the head and the cylinder block.
Installation
Install the cylinder head in reverse order. Before installation, check that the centering bushings on the cylinder block are in place.
Tighten the cylinder head mounting bolts in the specified sequence (fig. 12, a) in two stages: first tighten all the bolts to a torque of 3.4–4.2 kgf·m, and then tighten them to a torque of 9.8–12.1 kgf·m. On engines 2101, 2103, after this, tighten bolt 11 to a torque of 3.2–4.0 kgf·m (fig. 12, b).
On 2105 engines, after putting the belt on the camshaft pulley, install the tension roller bracket spring. Then smoothly turn the crankshaft two turns clockwise, keeping the belt under constant tension and not loosening the belt when the shaft stops. Tighten the tension roller mounting bolts. After this, check the alignment of the marks on the pulley and the camshaft bearing housing (see fig. 11), as well as marks on the crankshaft pulley with a long mark on the camshaft drive cover (see fig. 73). If the marks do not match, then reinstall the belt, and if they do match, then tighten the tension roller bracket mounting bolts.
On engines 2101, 2103, place the chain on the camshaft sprocket and install the sprocket on the camshaft. Loosen the cap nut of the chain tensioner, turning the crankshaft 2 turns in the direction of rotation, and check the alignment of the timing marks (see Fig. 11 and fig. 73). If the marks match, tighten the tensioner cap nut, sprocket mounting bolt and bend back the sprocket bolt lock washer.
After installing the cylinder head, check and adjust the ignition timing, the clearance between the levers and camshaft cams, as well as the air and throttle valve drive of the carburetor.
On engine 2105, tighten the cylinder head cover mounting nuts in the sequence shown in Fig. 13.
