Camshaft, Lifters and Push Rods: Service and Repair

Valvetrain Overview

• Only remove the plastic protectors installed to protect the open valves immediately before positioning the cylinder head.

• When replacing the cylinder head or cylinder head gasket, the coolant must be completely replaced.

• Cylinder heads with cracks between the valve seats can continue to be used without reducing service life, as long as the cracks have a Max. width of 0.5 mm.

• After installing the camshafts, the engine may not be started for approximately 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.

• Always replace gaskets and seals.






1 Seal

• Do not additionally oil or grease the sealing lip of the seal.

• Before installing, remove any remaining oil from the camshaft journal with a clean cloth.

• To install, tape over the groove on the camshaft taper.

• Removing and installing, refer to => [ Camshaft Seal ] Service and Repair.

2 Bolt

• 10 Nm

3 Nut

• 10 Nm

4 Bearing Frame

• Follow the sequence for loosening and tightening => [ Camshafts ] Service and Repair.

• Seal using silicone adhesive sealant (D 176 501 A1).

5 Exhaust Camshaft

• Removing and installing, refer to => [ Camshafts ] Service and Repair.

6 Intake Camshaft

• Removing and installing, refer to => [ Camshafts ] Service and Repair.

7 Roller Rocker Lever

• Mark the installed position.

• Do not interchange.

• Check the roller for ease of movement.

• Lubricate the running surfaces before installing.

8 Hydraulic Lash Adjusters

• Mark the installed position.

• Do not interchange.

• Lubricate the running surfaces before installing.

9 Valve

• Mark the installed position.

• Do not grind, only hand lapping is permitted.

• Valve dimensions, refer to => [ Valve Dimensions ].

• Checking valve guides, refer to => [ Valve Guide, Checking ] Testing and Inspection.

10 Cylinder Head

• See the note above.

• Checking for distortion, refer to => [ Checking the Cylinder Head for Distortion ] Cylinder Head Overview.

• Removing and installing, refer to => [ Cylinder Head ] Cylinder Head.

• All of the coolant must be replaced after installation.

11 Valve Stem Seal

Replacing, refer to => [ Valve Stem Seals, Cylinder Head Installed ] Service and Repair.

12 Valve Spring

13 Valve Spring Plate

14 Valve Retainers

15 Cap

• Always replace.

• Drive in using a suitable drift until it is flush.

Valve Dimensions





• Intake and exhaust valves must not be refaced by grinding. Only hand lapping is permitted.