11 12 729 Checking Cylinder Head For Water Leaks (N52K)

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2013 BMW 128i, 2012 BMW 128i, 2011 BMW 128i, 2010 BMW 128i, and 2009 BMW 128i. 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 (N52K) .

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 (N52K) .
Disassemble cylinder head . See 11 34 560 REPLACING ALL VALVE STEM SEALS (N52K) .

NOTE: Observe mounting of special tool 11 4 341 on cylinder.
Secure special tool 11 4 341 with bolts 11 4 345 to 25 Nm.

Fig 1: Identifying Special Tool Securing Position

G04751055

Courtesy of BMW OF NORTH AMERICA, INC.

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

Installation:

Cylinder no. 1 is marked.

Fig 2: Identifying Special Tool (11 4 341)

G04751056

Courtesy of BMW OF NORTH AMERICA, INC.

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

Sealing flange must rest flat.

Fig 3: Identifying Special Tool (11 4 342)

G04751057

Courtesy of BMW OF NORTH AMERICA, INC.

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

NOTE: Compressed air at valve max. 3 bar.
Heat cylinder head to 60 °.
Check for bubble formation in a water bath.

Fig 4: Identifying Special Tool (11 4 344)

G04751058

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.