Valve arrangement
The valve clearance should be checked and, if necessary, adjusted on a cold engine after it has been in the off state for about four hours. It is recommended to perform these procedures every 20,000 km of the car, however, at least once every two years.
1. Disconnect ground wire from battery.
2. On turbocharged engines, loosen the clamps and disconnect the air intake hose from the turbocharger.
3. Remove 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 valve clearance (see table. Valve clearance adjustment sequence) after turning the crankshaft so that the exhaust valves are in order maximally open.
Attention! Valve clearance on a cold engine: naturally aspirated engine: inlet valve - 0.30–0.35 mm; exhaust valve - 0.30–0.35 mm; turbocharged engine: intake valve - 0.10–0.20 mm; exhaust valve - 0.20–0.30 mm.
6. To adjust the valve clearance, loosen the adjusting bolt jam nut 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 snugly between the end of the lever and the head of the valve stem. In this position, tighten the locknut of the adjusting bolt while holding this bolt with a screwdriver.
7. Install the cylinder head cover and air filter.
8. Connect ground wire to battery.
Valve clearance adjustment sequence
Maximum opening of the exhaust valve | Inlet valve clearance adjustment | Exhaust valve clearance adjustment |
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 on the flywheel side.
Visitor comments