11 00 039 Checking compression of all cylinders (M60 / M62 / M73 / S62 / M54)
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Special tools required:
- 11 0 224
- 11 0 226
IMPORTANT:
High tension - mortal danger!
Cut off power supply to ignition coils (disconnect plug connection at DME control unit).
Necessary preliminary tasks:
- Connect charger or a second battery.
- Read out fault memory of DME control unit
- Pull fuel pump relay or fuel pump fuse.
- Start engine and allow residual fuel to drain out (pressure reduction).
- Remove all spark plugs. See 12 12 011 REPLACING ALL SPARK PLUGS
IMPORTANT:
Check Schrader valve on special tool 11 0 226 for tight fit.
Screw special tool 11 0 226 by hand into spark plug thread and connect special tool 11 0 224.
NOTE:
Check that sealing ring is in perfect condition (see arrow). See Fig 1.
Depress accelerator and actuate starter until compression stops rising.
Compression pressure.
Assemble engine.
Now clear the fault memory.