Support elements with hydraulic adjustment, checking
WARNING: This page is about a different car, the 2010 Audi A8, 2009 Audi A8, 2008 Audi A8, and 2007 Audi A8. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
- 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
- Socket T40058
- Feeler gauge
Work procedure
- Start engine and allow it to run until coolant fan has switched on once.
- Increase RPM to approx. 2500 for 2 minutes and perform road test if necessary.
NOTE:
- 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 .
- If support elements with hydraulic adjustment are still loud, locate faulty support element as follows:
- Remove cylinder head cover: Left → Left cylinder head cover, removing and installing , right → Right cylinder head cover, removing and installing .
- Insert guide pin of socket T40058 so that large diameter - arrow 1 - points to engine. Small diameter - arrow 2 - points to adapter.
- Rotate crankshaft until cam lobes on support element to be checked point upward.
- To determine play between cam lobes and roller rocker lever, press lever down - arrow -.
- If a 0.20 mm feeler gauge can slide between cam lobes and roller rocker lever, replace support element → Camshafts, removing and installing .
Final procedures
- Install cylinder head cover: Left → Left cylinder head cover, removing and installing , right → Right cylinder head cover, removing and installing .