Repair of hydraulic tappets is not possible. If defective, tappets are replaced as a set.
Short-term valve knocks after starting the engine or during acceleration after heavy engine load at high outside temperatures are of no significance.
If metal filings are found in the engine crankcase due to damage, for example to main or connecting rod bearings, disassemble and wash the tappets in sequence. Do not swap individual parts. For disassembly and side view, see the section "Removal air from the tappets".
Basic adjustment
Caution: Carefully insert the push rods into the push rod ball bearings. Control with your finger. Push rods installed on the edge of the push rod will result in incorrect adjustment results and damage to the push rods when turning the engine.
After removing the rocker shaft, the following basic adjustment is required:
Loosen the basic adjustment screws in the rocker arms until they are installed under the face with the rocker arms.
Set the crankshaft to the top dead center position of cylinder 1 (the distributor rotor must be facing the cylinder 1 mark on the distributor housing). To do this, turn the engine by the crankshaft.
Lightly tighten the adjusting screws of both rocker arms until they press against the valves (the valves have no gaps).
From this position, unscrew the adjusting screws two turns and lock them.
To continue adjusting the rocker arms of the 2nd, 3rd and 4th cylinders, turn the crankshaft to the left until the distributor runner is set to 90° each time.
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