11 12 101 Replacing cylinder head gasket (N52K)
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Special tools required:
- 11 4 430
- 11 4 470
IMPORTANT:
Aluminium-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 .
The end faces of aluminum screws/bolts are painted blue for the purposes of reliable identification.
Jointing torque and angle of rotation must be observed without fail (risk of damage) .
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 .
The end faces of aluminum screws/bolts are painted blue for the purposes of reliable identification.
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 cylinder head (N52K) .
Insert special tool 11 4 430 into bores.
Remove cylinder head seal.
IMPORTANT:
Check marking (1) on cylinder head gasket (B25 or B30).
Do not mix them up as this will cause engine damage .
- B = petrol/gasoline engine
- 30= displacement (3 liters)
Do not mix them up as this will cause engine damage .
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.
IMPORTANT:
Rubber coating (2) on cylinder head gasket (3) must not under any circumstances be damaged (electrochemical corrosion).
Cylinder head gasket (3) is a sheet-metal gasket.
Check adapter sleeves (1) for damage and firm seating.
Place cylinder 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 (N52K) .
Check cylinder head for water leaks, see 11 12 729 Checking cylinder head for water leaks (N52K) .
Check cylinder head for water leaks, see 11 12 729 Checking cylinder head for water leaks (N52K) .
Assemble engine.