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Valvetrain Assembly Overview






Valvetrain Assembly Overview





1 Seal

Do not additionally oil or grease sealing lip of oil seal

Before installing, remove oil remains from camshaft journal with a clean cloth

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

Removing and installing, refer to --> [ Camshaft Gasket ] Service and Repair

2 10 Nm

3 10 Nm

4 Bearing Frame

Follow the sequence for loosening and tightening. Refer to --> [ Camshafts ] Camshafts.

Seal with silicone sealant (D 176 501 A1).

5 Exhaust Camshaft

Removing and installing, refer to --> [ Camshafts ] Camshafts.

6 Intake Camshaft

Removing and installing, refer to --> [ Camshafts ] Camshafts.

7 Roller Rocker Lever

Mark installed position

Do not interchange

Check roller for easy movement

Lubricate running surfaces before installing

8 Hydraulic Valve Play Balancing Element

Mark installed position

Do not interchange

Lubricate the running surfaces before installing

9 Valve

Mark installed position

Do not rework, only lapping is permitted

Valve dimensions, refer to --> [ Valve Dimensions ] [1][2]Specifications.

Check valve guides. Refer to --> [ Valve Guides, Checking ] Testing and Inspection.

10 Cylinder Head

See notes --> [ Only remove the plastic protectors installed to protect the open valves immediately before positioning the cylinder head. ] Camshafts

Check for distortion. Refer to --> [ Checking Cylinder Head for Distortion ] Cylinder Head Assembly 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 Keepers

15 Cap

Replace

Drive in using a suitable drift until it is flush