11 00 039 Checking compression of all cylinders (N55)

Special tools required:

IMPORTANT: High voltage - danger to life!
Interrupt power supply to ignition coils.
Read and comply with notes on compression test.

Necessary preliminary work:

Unscrew tip (1) from special tool 11 0 222 .

IMPORTANT: Then check the Schrader valve that is now visible for secure seating.

Fig 1: Identifying Special Tools (11 8 731 And 11 0 222)

Courtesy of BMW OF NORTH AMERICA, INC.

Prepare special tool 11 0 222 in conjunction with 11 8 732 and 11 8 731 .

Fig 2: Preparing Special Tools

Courtesy of BMW OF NORTH AMERICA, INC.

Screw special tool 11 0 222 into special tool 11 8 731 to 10 Nm.

IMPORTANT: Oil thread on special tool 11 8 731 .

Fig 3: Screwing Special Tool (11 0 222) Into Special Tool (11 8 731)

Courtesy of BMW OF NORTH AMERICA, INC.

Screw special tool 11 0 222 by hand into spark plug thread and connect special tool 11 0 224 .

Depress accelerator pedal and actuate starter until compression pressure stops rising.

NOMINAL VALUES , compression pressure

Fig 4: Checking Cylinder Compression Pressure
Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine

Delete fault memory.