11 12 729 Checking cylinder head for water leaks (W10 /W11)

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Special tools required:

11 8 431
11 8 432
11 8 433

Necessary preliminary tasks:

Remove cylinder head. Refer to 11 12 100 Removing and installing/sealing cylinder head (COOPER S) .
Remove camshaft. Refer to 11 31 001 Replacing camshaft .
Remove thermostat.

Place special tools 11 8 431 on sealing surface of cylinder head.

Fig 1: Placing Special Tools On Sealing Surface Of Cylinder Head

G03309718

Courtesy of BMW OF NORTH AMERICA, INC.

Secure special tools 11 8 431 with special tool 11 8 433.

NOTE: Clean sealing surfaces.

Close off coolant opening with special tool 11 8 432.

Fig 2: Closing Off Coolant Opening

G03309719

Courtesy of BMW OF NORTH AMERICA, INC.

Connect compressed air supply to special tool 11 8 432.

Fig 3: Connecting Compressed Air Supply

G03309720

Courtesy of BMW OF NORTH AMERICA, INC.

Test pressure: 4.5 bar.

Immerse cylinder head in a water bath.

Check cylinder head for escaping air (cracks).

NOTE: If necessary, soften the bath water with a cleaning agent.

Assemble engine.