Cylinder Head Gasket: Service and Repair

11 12 101 Replacing cylinder head gasket (N55)

Special tools required:





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





Necessary preliminary work:

^ 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 fitting 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.