A6 Quattro Sedan 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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Wood or plastic wedge
Notes:
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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 G 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, Refer to Engine Lubrication, Service and Repair.
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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 at noise insulation.
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Loosen mounting parts -1 to 4- and remove noise insulation.