A6 Quattro Sedan V8-4.2L (BVJ) (2007)
Lifter / Lash Adjuster: Testing and Inspection
Support Elements with Hydraulic Adjustment, Checking
‹› The support elements with hydraulic adjustment cannot be serviced.
‹› Irregular valve noises are normal while starting the engine.
Special tools, testers and auxiliary items required
‹› Adapter (T40058)
‹› Feeler gauge
Work procedure
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Start engine and allow it to run until coolant fan has switched on once.
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Increase RPM to approx. 2500 for 2 minutes and perform road test if necessary.
‹› If irregular valve noises disappear but return during short drives, oil check valve must be replaced. Oil check valve location => [ Oil Check Valve
and Spray Nozzle Valve Assembly Overview ] See: Engine Lubrication/Oil Pump/Oil Pressure Regulator Valve/Service and Repair/Oil Check
Valve and Spray Nozzle Valve Assembly Overview.
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If support elements with hydraulic adjustment are still loud, locate faulty support element as follows:
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Remove cylinder head cover: Left => [ Left Cylinder Head Cover ] See: Cylinder Head Assembly/Valve Cover/Service and Repair/Left Cylinder
Head Cover, right => [ Right Cylinder Head Cover ] See: Cylinder Head Assembly/Valve Cover/Service and Repair/Right Cylinder Head Cover.
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Insert guide pin of adapter (T40058) so that large diameter - arrow 1 - points to engine. Small diameter - arrow 2 - points to adapter.
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Rotate crankshaft until cam lobes on support element to be checked point upward.
