HYDRAULIC ADJUSTING ELEMENTS, CHECKING
Note. The hydraulic adjusting elements cannot be repaired. Irregular valve noises are normal while starting the engine.
Special tools and workshop equipment required
- Crankshaft Adapter T03003
- Feeler gauge
Procedure
Start the engine and let it run until the coolant fan switches on once.
Increase engine speed for about 2 minutes to approximately 2500 RPM, perform a road test if necessary.
Note. If the irregular valve noises disappear, but return during short drives, oil filter bracket and integrated oil check valve must be replaced.
If the hydraulic adjusting elements are still loud, determine which one is faulty as follows
Remove cylinder head cover. Refer to CYLINDER HEAD COVER .
Remove the right front wheel. Refer to Removal and Installation .
Scheme 667
Remove the right front underside of wheel housing liner. Refer to Removal and Installation .
Turn the crankshaft using the T03003 in direction of engine rotation -arrow- until the cam lobes on the hydraulic adjusting element to be checked face up.
Scheme 668
Note. Ignore -1 and 2-.
To determine the play between cam lobes and roller rocker lever, press lever down -arrow-.
Scheme 669
If a 0.20 mm feeler gauge can slide between the cam lobes and roller rocker lever, replace the hydraulic adjusting element. Refer to CAMSHAFTS .
Final Procedures
Install the front underside of wheel housing liner. Refer to Removal and Installation .
Install the front wheel. Refer to Removal and Installation .
Install the cylinder head cover. Refer to CYLINDER HEAD COVER .