11 12 729 Checking Cylinder Head For Water Leaks (N62/N62TU)

WARNING: This page is about a different car, the 2008 BMW Alpina and 2007 BMW Alpina. However, it is still accessible from the selected car via links, so may be relevant.

Special tools required:

11 9 430
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.