Compression Check: Testing and Inspection

11 00 039 Checking compression of all cylinders (N55)





Special tools required:
^ 11 0 222
^ 11 0 224
^ 11 8 731
^ 11 8 732





Important!
High tension - mortal danger!
Interrupt power 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.