Hydraulic Valve Lifters, Checking

Hydraulic valve lifters, checking

Special tools and equipment
- Feeler gauge
- Wooden or plastic wedge

Notes:
Replace complete valve lifters only (cannot be adjusted or repaired).
Irregular valve noise when starting engine is normal.

Test sequence
- Start engine and let run until radiator fan has switched on once.
- Increase engine speed to approximately 2500 RPM for 2 minutes.

If hydraulic valve lifters are still noisy, locate faulty valve lifter(s) as follows:
- Remove cylinder head cover.
- Turn crankshaft clockwise until camshaft lobe for valve lifter to be tested is pointing upwards.
- Measure play between camshaft lobe and valve lifter.
- If play is greater than 0.2 mm replace valve lifter. If minimal play of 0.1 mm or no play is measured, continue test as follows:






- Lightly press valve lifter downward with a wood or plastic wedge. If 0.20 mm thick feeler gauge can be inserted between camshaft and valve lifter, replace valve lifter.

Note: After installing new valve lifters, the engine may not be started for approx. 30 minutes. The hydraulic equalization elements must seat themselves (otherwise the valves will crash into the pistons).