Compression Check: Testing and Inspection

11 00 039 - Checking compression of all cylinders (N12/N14)





- Read out fault memory of DME control unit
- Check stored faults
- Rectify faults
- Clear 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 Service and Repair.





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 onto special tool 11 8 731 to 10 Nm.





Important!
Do not forget to oil spark plug thread of 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 lead (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
Now clear the fault memory.