Jetta L4-2.0L (AZG) (2004)
Lifter / Lash Adjuster: Testing and Inspection
Hydraulic lifters, checking
Special tools and equipment
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Feeler gauge
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Wood or plastic wedge
Note:
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Replace each faulty hydraulic lifter complete only (cannot be adjusted or serviced).
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Irregular valve noises when starting engine are normal.
Test sequence
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Start engine and run until coolant fan has switched on once.
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Increase engine speed to about 2500 rpm and hold for approximately 2 minutes.
If the hydraulic lifters are still noisy, locate faulty lifters as follows:
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Remove intake manifold upper part.
Note: Seal the intake ports in the intake manifold lower section with clean cloths.
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Remove cylinder head cover.
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Rotate crankshaft clockwise, until cam of lifter to be checked is pointing up.
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Determine clearance between cam lob and hydraulic lifter.
If the clearance is greater than 0.2 mm:
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Replace hydraulic lifter
If clearance is less than 0.1 mm or no clearance exists, proceed with check as follows:
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Push hydraulic lifter down lightly with a wooden or plastic wedge. If when lifter is pushed down a 0.2 mm thick feeler gauge can be pushed
between camshaft and lifter, lifter must be replaced.
Note: When new lifters have been installed the engine must not be started for about 30 minutes. The hydraulic compensation elements must settle
or the valves will strike the pistons.