Compression Check: Testing and Inspection

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 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.





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





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

Important!
Oil thread on special tool 11 8 731.





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





Assemble engine.

Delete fault memory.