Passat L4-1984cc 2.0L DOHC (9A) (1990)
Hydraulic Cam Follower: Testing and Inspection
Hydraulic Valve Lifters Checking
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Hydraulic lifters must be replaced as an assembly, they cannot be repaired or adjusted.
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Intermittent valve noise during warm-up is normal.
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Start engine and let idle until radiator cooling fan comes on at least once, then increase engine speed to 2500 rpm and maintain for two minutes
If the lifters are still noisy, determine which ones are defective as follows:
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Remove the intake manifold and cylinder head cover
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Turn crankshaft clockwise until lobes of lifter to be checked are pointing straight up
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Push down on lifter using a wood or plastic wedge; if the lifter can be pushed down more than 0.1 mm, replace the lifter
CAUTION After installing new litter(s), do not start the engine for at least 30 minutes to allow the lifter to bleed down. Otherwise the valves
could hit the piston