11 12 101 Replacing Cylinder Head Gasket (N51)
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Special tools required:
- 11 4 430
- 11 4 470
For the following special tools, refer to ENGINE - SPECIAL TOOLS (N51) .
IMPORTANT:
Aluminum-magnesium materials. No
steel screws/bolts may be used due to the threat of electrochemical corrosion. A magnesium crankcase requires aluminum screws/bolts exclusively. 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 tasks:
- Remove cylinder head . See 11 12 100 REMOVING AND INSTALLING/SEALING CYLINDER HEAD (N51) .
Insert special tool 11 4 430 into bores. See Fig 1.
Remove head gasket.
IMPORTANT:
Check identification (1) on cylinder head gasket (N51).
Remove remnants of oil and dirt from pocket holes (1).
IMPORTANT:
Work on sealing face on engine block and on cylinder head with special tool 11 4 470 only.
Do not use any metal-cutting tools.
Do not use any metal-cutting tools.
Identification (1) of head gasket.
IMPORTANT:
Rubber coating (2) on cylinder head gasket must not under any circumstances be damaged (electrochemical corrosion).
Gasket (3) is a beaded metal gasket
Check adapter sleeves (1) for damage and firm seating.
Place head gasket (2) in direction of arrow on engine block.
NOTE:
Check cylinder head for deviation from flatness
. See 11 12 719 RESURFACING CYLINDER HEAD SEALING FACE (N51) . Check cylinder head for water leaks
. See 11 12 729 CHECKING CYLINDER HEAD FOR LEAKS (N51) .
Assemble engine.