Contents: Removal ↓ Installation ↓
The cylinder head is removed from the engine on the vehicle 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.
Removal
1. Drain the coolant from the radiator and cylinder block and remove the air filter.
2. Disconnect the wires from the battery, spark plugs and coolant temperature gauge sensor.
3. Disconnect the choke cable from the carburetor.
4. Using key 67.7812.9514, remove the spark plugs and coolant temperature sensor.
5. Disconnect the throttle actuator rods from the intermediate lever on the cylinder head cover and remove the cover.
6. Turn the crankshaft until the mark on the pulley aligns with the long mark on the camshaft drive cover (see Fig. Location of ignition timing marks), and the marks on the camshaft sprocket with the mark on the camshaft bearing housing (see Fig. Checking the alignment of the timing mark on the camshaft sprocket with the mark on the bearing housing).
[The text is copied from the online portal: VazBook]
7. Disconnect the hose from the heater fluid supply pipe and the heater fluid outlet pipe mounting bracket from the outlet manifold.
8. Disconnect the hoses from the carburetor, intake manifold and from the outlet pipe of the cylinder head cooling jacket.
9. Disconnect the starter shield and the exhaust pipe from the exhaust manifold.
Note! It is better to leave the exhaust manifold and intake manifold with the carburetor on the head. They can be removed later when disassembling the cylinder head.
10. Loosen the chain tensioner cap nut, press the tensioner rod with a mounting blade and secure it with the cap nut.
11. Remove the camshaft sprocket and bearing housing together with the camshaft.
12. Loosen the bolts securing the cylinder head to the block and remove the head.
Installation
1. To reinstall and secure the head to the cylinder block, perform the described operations in reverse order, while:
- don't forget to install the cylinder head gasket and head cover gasket;
- tighten the head mounting bolts in the sequence shown in Fig Cylinder Head Bolt Tightening Sequence, and the nuts of the camshaft bearing housing studs - in the sequence shown in Fig. Camshaft Bearing Housing Nut Tightening Procedure.
2. Tighten the cylinder head mounting bolts in two steps:
- pre-torque 33.3–41.16 N·m (3.4–4.2 kgf·m) bolts 1–10;
- finally tighten bolts 1–10 with a torque of 95.94–118.38 N·m (9.79–12.08 kgf·m) and bolt 11 with a torque of 31.36–39.1 N·m (3.2–3.99 kgf·m).
3. When installing the chain, pay attention to the alignment of the installation marks (see Fig. Checking the alignment of the timing mark on the camshaft sprocket with the mark on the bearing housing and fig. Location of ignition timing marks). Tighten the chain as indicated in subsection 3.12.3.
4. When installing the cylinder head cover with a gasket, tighten the cover mounting nuts to a torque of no more than 7.85 N·m (0.8 kgf·m) to avoid rupture of the gasket at the mounting holes and warping of the cover. When repairing the engine, it is recommended to replace the cover gasket with a new one.
5. After installing the cylinder head, check and adjust the ignition timing.