Checking cylinder head for watertightness

Prerequisite 

All valves are removed

• Release the venting connector (2).
• Position special tool 0 496 409 (11 8 081)  on cylinder head.
• The rubber layer (marked yellow) on the special tool 0 496 409 (11 8 081)  must point to the cylinder head.
• The rigid side of the special tool 0 496 409 (11 8 081)  must face downwards.

  Courtesy of BMW OF NORTH AMERICA, INC.

• To fasten the special tool 0 496 409 (11 8 081)  , the washers (1) of the cylinder head bolt must  be used.
• Fasten the special tool 0 496 409 (11 8 081)  (2) with the screws from the set of special tools 0 496 408 (11 8 080)  (3).

  Observe the following tightening sequence. 

  Courtesy of BMW OF NORTH AMERICA, INC.

• Tighten screws in the order (1) to (10).

Fig 1: Cylinder Head Screws Tightening Sequence

Courtesy of BMW OF NORTH AMERICA, INC.

• Position the valve (1) from the set of special tools 0 496 408 (11 8 080)  on the cylinder head and tighten.

• Apply the valve (1) with 3 bars of pressure (2).
• Dip the cylinder head into a water bath and check for leakage.

  Courtesy of BMW OF NORTH AMERICA, INC.

  The water bath can be made easier with standard dish soap.

  The formation of blisters indicate faults or cracks on the cylinder head. 

• Relieve the pressure on the valve (1) with a tire pressure gauge (2).
• Disassemble the valve (1) from the set of special tools 0 496 410 (11 8 082)  .

  Courtesy of BMW OF NORTH AMERICA, INC.

• Release the screws of the device (1).
• Remove the device (1).
• Replace the venting connector (2).

  Parts  : Venting connector

• Tighten the venting connector (2).

Courtesy of BMW OF NORTH AMERICA, INC.

• Dry all openings on the cylinder head with compressed air.
• Coat the bearing positions of the camshaft with motor oil.