11 12 729 Checking cylinder head for watertightness (N57 Diesel)

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Special tools required:

2 318 431 .
2 337 568 .

IMPORTANT: Pressure-test cylinder head to max. 3 bar.
Heat cylinder head to 60 °.
Check for formation of bubbles in a water bath.

Necessary preliminary tasks:

Remove CYLINDER HEAD .
Disassemble CYLINDER HEAD .

NOTE: Mounting special tool 2 318 431 .

Secure special tool 2 318 431 with the original cylinder head bolts (1).

Tightening torque: 25 Nm .

Fig 1: Identifying Original Cylinder Head Bolts And Special Tool (2 318 431)

Courtesy of BMW OF NORTH AMERICA, INC.

Secure special tool 2 337 568 with bolts (1).

NOTE: Compressed air at valve (1) must not exceed 3 bar .
Heat cylinder head to 60 °.
Check for formation of bubbles in a water bath.

Fig 2: Securing Special Tool (2 337 568) With Bolts

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.