audi Workshop Repair Guides

Audi Workshop Service and Repair Manuals

All Technical Service Bulletins for Lifter / Lash Adjuster:|151118|Page 3770 > < All Technical Service Bulletins for Lifter / Lash Adjuster:|151118|Page 3768
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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.

^

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.

^

Loosen mounting parts -1 to 4- and remove noise insulation.

All Technical Service Bulletins for Lifter / Lash Adjuster:|151118|Page 3770 > < All Technical Service Bulletins for Lifter / Lash Adjuster:|151118|Page 3768