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

WARNING: This page is about a different car, the 2005 BMW 645Ci and 2004 BMW 645Ci. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

For Special Tool identification, refer to ENGINE - SPECIAL TOOLS - 645CI .

Special Tools Required:

11 9 430
11 9 431
11 9 432
11 9 433

(Cylinder head dismantled)

Have special tool kit 11 9 430 ready.

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 opening with special tool 11 9 432 and tighten down.

Fig 1: Cylinder Head Pressure Tester

Courtesy of BMW OF NORTH AMERICA, INC.

Connect compressed air hose (1) to pressure gauge.

Fig 2: Connecting Compressed Air Hose To Pressure Gauge

Courtesy of BMW OF NORTH AMERICA, INC.

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

Check cylinder head for escaping air (cracks).

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