11 00 039 Checking compression of all cylinders (N55)

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Special tools required:

IMPORTANT: High voltage - danger to life!
Interrupt power supply to ignition coils.

Necessary preliminary work:

Remove SPARK PLUGS .

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)

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

Fig 2: Preparing Special Tools

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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: Screwing Special Tool (11 0 222) Into 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: see TECHNICAL DATA

Fig 4: Checking Cylinder Compression Pressure
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Assemble engine

Delete fault memory.