Compression Check: Testing and Inspection

11 00 039 Checking compression in all cylinders (N43/ N53/ N54)

Special tools required:





- Read out fault memory of DME control unit
- Check stored faults
- Rectify faults
- Delete fault memory

Important!
High tension - mortal danger!





Interrupt power supply to ignition coils.
Read and comply with notes on compression pressure check.





Necessary preliminary tasks:
^ 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.

Use adapter (1) if the compression pressure is being checked with the BMW diagnosis system.

Depress accelerator pedal and actuate starter until compression pressure stops rising.
^ Nominal values, compression pressure

Assemble engine





Delete fault memory.