11 12 729 Checking cylinder head for water leaks (N62/N62TU)

WARNING: This page is about a different car, the 2010 BMW 550i, 2009 BMW 550i, and 2008 BMW 550i. However, it is still accessible from the selected car via links, so may be relevant.

Special tools required:

11 9 430 . See ENGINE- SPECIAL TOOLS .
11 9 431
11 9 432
11 9 433

(cylinder head dismantled)

Prepare special tool kit 11 9 430.

NOTE: Special tool kit 11 9 430 can be used for cylinder bank 1 to 4 and cylinder bank 5 to 8.

Place special tool 11 9 431 on cylinder head sealing surface, insert screws (special tool 11 9 433 ) and tighten down.

Seal coolant aperture with special tool 11 9 432 and tighten down.

Fig 1: Identifying Special Tools

Courtesy of BMW OF NORTH AMERICA, INC.

Connect compressed air hose (1) to pressure gauge.

Immerse cylinder head in a water bath. Inspection pressure 4.5 bar.

Check cylinder head for escaping air (cracks).

NOTE: If necessary, add cleaning agent to water bath.

Fig 2: Identifying Compressed Air Hose

Courtesy of BMW OF NORTH AMERICA, INC.