Hydraulic Adjusting Elements, Checking
The hydraulic adjusting elements cannot be repaired.
Irregular valve noises are normal while starting the engine.
Special tools and workshop equipment required
- Feeler Gauge
- Crankshaft Socket T40058 for vehicles with a S tronic transmission 0B5
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.
-- If the hydraulic adjusting elements are still loud, determine which one is faulty as follows:
-- Remove the cylinder head cover: left refer to LEFT CYLINDER HEAD COVER, REMOVING AND INSTALLING , right refer to RIGHT CYLINDER HEAD COVER, REMOVING AND INSTALLING .
-- Rotate the crankshaft until the lobes on the hydraulic adjusting element to be checked face upward:
Vehicles with A Manual Transmission
-- Move the vehicle forward with 4th gear engaged and the ignition switched off.
Vehicles with S tronic Transmission 0B5
-- Remove the front noise insulation -1-. Refer to NOISE INSULATION, REMOVING AND INSTALLING .
-- Insert the Crankshaft Socket T40058 guide pins as follows:
- The large diameter -arrow 1- faces the engine.
- The small diameter -arrow 2- faces the adapter.
-- Rotate the crankshaft in direction of engine rotation -arrow- using the Crankshaft Socket T40058 and offset open-end wrench.
Continuation for All Vehicles
-- To determine the play between cam lobes and roller rocker lever, press lever down -arrow-.
-- If a 0.20 mm feeler gauge can slide between the cam lobes and roller rocker lever, replace the hydraulic adjusting element. Refer to CAMSHAFT, REMOVING AND INSTALLING .
Final Procedures
-- Install the front noise insulation. Refer to NOISE INSULATION, REMOVING AND INSTALLING .
-- Install the cylinder head cover: left refer to LEFT CYLINDER HEAD COVER, REMOVING AND INSTALLING , right refer to RIGHT CYLINDER HEAD COVER, REMOVING AND INSTALLING .