Lifter / Lash Adjuster: Testing and Inspection

Hydraulic Adjusting Elements, Checking

• The hydraulic adjusting elements cannot be repaired.

• Irregular valve noises are normal while starting the engine.

Special tools, testers and auxiliary items required

• Feeler gauge

• Socket (T40058) for vehicles with a S-Tronic transmission:

Checking

- 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:

Risk of injury from coolant fan starting by itself.

• The radiator fan can come on even when the ignition is turned off, for example, caused by the heat still in the engine compartment.

- Remove the cylinder head cover. Refer to => [ Left Cylinder Head Cover ] Left Cylinder Head Cover, => [ Right Cylinder Head Cover ] Right Cylinder Head Cover.

- Rotate the crankshaft until the lobes on the hydraulic adjusting element to be checked face upward:

- Remove the front noise insulation - 1 -.




- Insert the (T40058) guide pins as follows:






• The large diameter - arrow 1 - faces the engine.

• Small diameter - arrow 2 - points to adapter.

- Rotate the crankshaft 180° further in direction of engine rotation - arrow - using the (T40058) and offset box wrench.






- 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 => [ Camshafts ] Service and Repair.

Final Procedures

- Install the front noise insulation.

- Install the cylinder head cover. Refer to => [ Left Cylinder Head Cover ] Left Cylinder Head Cover, => [ Right Cylinder Head Cover ] Right Cylinder Head Cover.