Valve arrangement
The valve clearance should be checked and, if necessary, adjusted on a cold engine after it has been off for about four hours. It is recommended to perform these procedures every 20,000 km of the vehicle's mileage, but not less often than once every two years.
1. Disconnect the ground cable from the battery.
2. On turbocharged engines, loosen the clamps and disconnect the air inlet hose from the turbocharger.
3. Remove the air filter.
4. Remove the cylinder head cover.
Attention! Since the end of 1987, a reusable cylinder head cover gasket has been installed.
5. Adjust the valve clearance (see table Valve clearance adjustment sequence) after turning the crankshaft so that the exhaust valves are in order as open as possible.
Attention! Operating valve clearance on a cold engine: naturally aspirated engine: intake valve – 0.30–0.35 mm; exhaust valve – 0.30–0.35 mm; turbocharged engine: intake valve – 0.10–0.20 mm; outlet valve – 0.20–0.30 mm.
6. To adjust the valve clearance, loosen the lock nut of the adjusting bolt of the corresponding valve lever while holding the adjusting bolt with a screwdriver, and then turn the adjusting bolt until a feeler gauge plate of the appropriate thickness fits tightly between the end of the lever and the head of the valve stem. In this position, tighten the lock nut of the adjusting bolt while holding this bolt with a screwdriver.
7. Install the cylinder head cover and air filter.
8. Connect the ground wire to the battery.
Valve clearance adjustment sequence
| Maximum opening of the exhaust valve | Adjusting the intake valve clearance | Adjusting the exhaust valve clearance |
| 1st cylinder | 3rd cylinder | 4th cylinder |
| 3rd cylinder | 4th cylinder | 2nd cylinder |
| 4th cylinder | 2nd cylinder | 1st cylinder |
| 2nd cylinder | 1st cylinder | 3rd cylinder |
Attention! The first cylinder is located on the flywheel side.