Cylinder Head Gasket: Service and Repair

11 12 101 Replacing Cylinder Head Gasket (N55)

Special tools required:







IMPORTANT:
Aluminium screws/bolts must be replaced each time they are released.
Aluminium screws/bolts are permitted with and without colour coding (blue).
For reliable identification:
Aluminium screws/bolts are not magnetic.
Jointing torque and angle of rotation must be observed without fail (risk of damage).







Necessary preliminary tasks:
- Remove cylinder head.
- Check cylinder head for deviation from flatness.
- Check cylinder head for watertightness.







Remove the cylinder head gasket.
Insert special tool 11 4 430 into feed pipe of oil pump.







Remove remnants of oil and dirt from blind holes (1).

IMPORTANT:
Work on sealing surface on engine block and on cylinder head with special tool 11 4 470 only.
Do not use any metal-cutting tools.







Check adapter sleeves (1) for damage and firm seating.







The cylinder head gasket on the N55 is a beaded metal gasket.







Place cylinder head gasket (2) in direction of arrow on engine block.
Fix new cylinder head gasket with fitting sleeves (1).







Assemble engine.