11 12 729 Checking Cylinder Head For Water Leaks (S85)

WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 2010 BMW M6, 2010 BMW M5, 2009 BMW M6, 2009 BMW M5, and 2008 BMW M6. However, it is still accessible from the selected car via links, so may be relevant.

Special tools required:

11 5 230
11 5 231
11 5 233
11 5 235
11 5 237

NOTE: Special tool 115 230 can be used for both cylinder heads.

Necessary preliminary tasks:

Remove left cylinder head or right cylinder head .
Disassemble cylinder head.

Secure special tool 11 5 231 with old cylinder head bolts.

Secure special tool 11 5 235 with special tool 11 5 237.

Secure special tool 11 5 233 with special tool 11 5 237.

Fig 1: Identifying Special Tools 11 5 231, 11 5 233, 11 5 235 And 11 5 237

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Immerse cylinder head in a water bath.

Test pressure: 4.5 bar.

Check cylinder head for escaping air (cracks).

If necessary, add cleaning agent to water bath.

Assemble engine.