Jetta V6-2.8L (AFP) (1999)
Lifter / Lash Adjuster: Testing and Inspection
Checking hydraulic lifters
Special tools, equipment, test and inspection devices; required accessories:
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Feeler gauge
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Wooden or plastic wedge
Test procedure
Notes:
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Valve lifters must be replaced as units (they cannot be adjusted or repaired).
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Intermittent valve noises during engine start-up are normal.
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Start engine and let it run until radiator fan has turned on once.
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Increase engine speed to approximately 2500 rpm for 2 minutes.
If the hydraulic lifters continue to make noise, find the faulty lifter as follows:
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Remove cylinder head cover.
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Turn camshaft at oscillating damper fastening screw clockwise until valve lifter cams being tested are in upper position.
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Determine clearance between cams and valve lifters.
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If clearance is greater than 0.2 mm, replace valve lifters. If clearance is less then 0.1 mm or no clearance is determined, continue test as follows:
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Push valve lifters downward with a wooden or plastic wedge. If you can feel unrestricted motion of more than 0.2 mm until valve opens, replace
lifters.
Note: After installing new valve lifters, do not start the engine until after about 30 minutes. Hydraulic balancing elements must become properly
seated (otherwise, valves will make contact with the piston).