Hydraulic Lifters, Checking

Hydraulic valve lifters, checking

Special tools, testers and auxiliary items required
^ Feeler gauge
^ Wooden or plastic wedge

Note:
^ Replace complete valve lifters only (cannot be adjusted or serviced).
^ Irregular valve noises are normal while starting the engine.

Test sequence
- Start engine and let it run until the radiator fan has cycled once.
- Increase engine speed to approx. 2500 RPM for 2 minutes.

If hydraulic valve lifters are still noisy, determine which lifter or lifters are defective as follows:
- Remove cylinder head cover.
- Turn crankshaft clockwise until camshaft lobe for valve lifter to be tested is pointing upward.
- 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 procedure 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 hydraulic valve lifters, do not operate the starter or allow the crankshaft to turn for at least 30 minutes. The hydraulic valve lifters need time to compress, otherwise valves may strike the pistons.