Compression Check: Testing and Inspection

CHECKING COMPRESSION OF ALL CYLINDERS

- M50 / M50TU -






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






Caution!
High tension - mortal danger!
Interrupt power supply to ignition coils.
Follow instructions for checking compression pressure.






Disconnect DME relay (k6300).






Remove all spark plugs.

Screw special tool 11 0 226 by hand into spark plug thread and connect special tool 11 0 224.

Note:
Check that seal is in perfect condition.






Depress accelerator and actuate starter until compression stops rising.

Compression pressure. (approx. equal value for all cylinders) 10...11 min. bar. (145... 160 min. psi.)






Now clear the fault memory.