A4 Quattro Wagon V6-3.0L (AVK) (2002)
Lifter / Lash Adjuster: Testing and Inspection
Hydraulic valve lifters, checking
Special Tools and Equipment
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Feeler gauge
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Wooden or plastic wedge
Note:
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Hydraulic valve lifters cannot be serviced.
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Irregular valve noise when starting engine is normal.
Test sequence
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Start engine and let run until coolant temperature reaches at least 80°.C
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Increase RPM to 2500 for approximately 2 minutes, if necessary road test vehicle.
Note: If unusual valve noises disappear but then reappear during drive, replace oil retaining valve. Oil retaining valve, component location:
Below cover at intake manifold.
If hydraulic valve lifters are still loud, locate faulty valve lifter as follows:
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Remove cylinder head cover.
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For vehicles with auxiliary heater, remove bolts (arrows) for exhaust pipe of parking heater/auxiliary heater on noise insulation.
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Remove bolts or quick-release screws -1- and -2- and remove front noise insulation.
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Turn crankshaft at center bolt of toothed belt gear clockwise until the cams of the cylinder to be checked point upward (arrows).
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Determine play between cams and valve lifters.