Cylinder Head Gasket: Service and Repair

11 12 112 - Replacing both cylinder head gaskets (S65)

Special tools required:
- 11 4 470

Necessary preliminary tasks:
- Remove left cylinder head.
- Remove right cylinder head.
- Check cylinder head for leaks.

Important!
Do not open screw plugs.
The screw plug must always be replaced if it is opened by mistake.

Installation:
Make sure oil bore (1) is clean.

Note:
Picture shows S85.

Check dowel sleeves (1) for damage and correct installation position.
Clean sealing faces with special tool 11 4 470.
Do not use any metal-cutting tools.

Remove spacer sleeves (1) in direction of arrow.

Note:
Picture show cylinder bank 2. Procedure for cylinder bank 1 is identical.

Remove non-return valves (1) in direction of arrow.

Installation:
Replace spacer sleeves (1) and non-return valves (2).
Note installation direction of non-return valves (2).

Replace head gasket (1) for cylinders 1-4.

Replace head gasket (1) for cylinders 5-8.

Note:
There is no oversize gasket for the S65 engine.

Assemble engine.