11 12 729 Check Cylinder Head For Water Leaks (N54)

WARNING: This page is about a different car, the 2010 BMW 135i, 2009 BMW 135i, and 2008 BMW 135i. However, it is still accessible from the selected car via links, so may be relevant.

Special tools required:

For the following special tools, refer to ENGINE- SPECIAL TOOLS .

11 4 341
11 4 342
11 4 344
11 4 345

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

Necessary preliminary tasks:

Remove cylinder head . See 11 12 100 REMOVING AND INSTALLING CYLINDER HEAD (N54) .
Disassemble cylinder head . See 11 34 552 REMOVING AND INSTALLING OR REPLACING ALL VALVES (N54) .

NOTE: Observe mounting of special tool 11 4 341 on 1 cylinder.

Secure special tool 11 4 341 with bolts 11 4 345 to 25 Nm .

Fig 1: Securing Special Tool 11 4 341 With Bolts 11 4 345

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Install special tool 11 4 341 with special tool 11 4 345.

Installation:

1 cyl is marked.

Fig 2: Identifying Special Tool 11 4 341

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Fit special tool 11 4 342 with bolts (1), insert knurled screw in direction of arrow.

Sealing flange must rest flat.

Fig 3: Identifying Special Tool 11 4 342 With Bolts

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Secure special tool 11 4 344 with bolts (1).

NOTE: Compressed air at valve (2) must not exceed 3 bar .
Heat cylinder head to 60°.
Check for bubble formation in a water bath.

Fig 4: Identifying Special Tool 11 4 344 With Bolts

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.