Compression Check: Testing and Inspection

11 00 039 Checking Compression Of All Cylinders (N16 And N18)







- Read out fault memory of DME engine management module
- Check stored faults
- Rectify faults
- Delete fault memory







IMPORTANT:
High tension - mortal danger.
Disconnect 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 onto special tool 11 8 731 to 10 Nm.







IMPORTANT: Do not to forget to coat spark plug thread of special tool 11 8 731 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, compression pressure







Assemble engine.
Delete fault memory.