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

WARNING: This page is about a different car, the 2010 BMW X6, 2009 BMW X6, and 2008 BMW X6. However, it is still accessible from the selected car via links, so may be relevant.

Special tools required:

11 0 222
11 0 224
11 8 731
11 8 732

See ENGINE - SPECIAL TOOLS (N54, N63) .

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 . See 12 12 011 REPLACING ALL SPARK PLUGS (N53, N54, N63) .

Unscrew tip (1) from special tool 11 0 222 .

IMPORTANT: Then check the Schrader valve that is now visible for secure seating.

Fig 1: Identifying Tip And Special Tool 11 0 222

Courtesy of BMW OF NORTH AMERICA, INC.

Prepare special tool 11 0 222 in conjunction with 11 8 732 and 11 8 731 .

Fig 2: Identifying Special Tool 11 0 222, 11 8 732 And 11 8 731

Courtesy of BMW OF NORTH AMERICA, INC.

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

Fig 3: Screwing Special Tool 11 0 222 Into Special Tool 11 8 731 To 10 Nm

Courtesy of BMW OF NORTH AMERICA, INC.

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. See 11 00 ENGINE IN GENERAL N54 B30 .

Fig 4: Identifying Adapter Lead

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine

Now clear the fault memory.