11 00 039 Checking compression of all cylinders (N55)

Special tools required:

IMPORTANT: High tension - mortal danger!
Interrupt voltage supply to ignition coils.
Read and comply with notes on compression pressure check.

Necessary preliminary tasks:

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 Tool (11 0 222) And (11 8 731)

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

Fig 2: Identifying Special Tools (11 0 222), (11 8 732) And (11 8 731)

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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: Tightening Special Tool (11 0 222) Onto Special Tool (11 8 731)

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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: Depressing Accelerator Pedal
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Assemble engine.

Delete fault memory.