Compression Check: Testing and Inspection

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





Special tools required:
- 11 0 222
- 11 0 224
- 11 8 731 11 8 730 Adapter
- 11 8 732 11 8 730 Adapter





- 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 11 8 730 Adapter and 11 8 731 11 8 730 Adapter.





Screw special tool 11 0 222 into special tool 11 8 731 11 8 730 Adapter to 10 Nm.





Important!
Do not to forget to coat spark plug thread of special tool 11 8 731 11 8 730 Adapter with oil.

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 Engine in General N54/B30, compression pressure





Assemble engine
Now clear the fault memory.