Support elements with hydraulic adjustment, checking
WARNING: This page is about a different car, the 2009 Audi A4, 2008 Audi A4, 2007 Audi A4, 2006 Audi A4, and 2005 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.
Special tools, testers and auxiliary items required
- Feeler gauge
NOTE:
- The support elements with hydraulic adjustment cannot be serviced.
- Irregular valve noises are normal while starting the engine.
Work procedure
- Start engine and let it run until radiator fan has switched on once.
- Increase engine speed for about 2 minutes to approx. 2500 RPM, perform road test if necessary.
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 .
- Rotate crankshaft until lobes on support element to be checked face upward:
- Vehicles with manual transmission: With 4th gear engaged an ignition switched off, slide forward.
- Vehicles with multitronic: turn crankshaft clockwise at ribbed belt pulley center bolt.
- Check play between cam lobes and roller rocker lever.
- Press roller rocker lever down with screwdriver - arrow -.
If a 0.20 mm feeler gauge can be inserted between camshaft and roller rocker lever:
- Replace support element → Camshafts, removing and installing .
NOTE:
- After installing the camshafts, the engine may not be started for approx. 30 minutes. The hydraulic equalization elements must seat themselves (otherwise the valves will crash into the pistons).
- After working on the valvetrain and lifters, carefully rotate the crankshaft by hand at least 2 full revolutions before starting to be sure that valves do not strike the pistons.