11 12 729 Checking cylinder head for watertightness (M52TU / M54 / M56)

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Special tools required:

NOTE: For special tools, refer to ENGINE - SPECIAL TOOLS .

11 7 390
11 7 391
11 7 392
11 7 393
11 7 394
11 7 395
11 7 396
11 7 397
11 7 398
1. (Cylinder head dismantled)

Prepare special tool kit 11 7 390.

NOTE: Special tool kit 117390 consists of special tools 11 7 391 / 11 7 392 / 11 7 393 / 11 7 394 / 11 7 395 / 11 7 396 / 11 7 397 / 11 7 398.

Place special tools 11 7 391 /11 7 392 on cylinder head sealing surface and screw down with cylinder head bolts.

Fig 1: Identifying Special Tools 11 7 391 And 11 7 392

G03163921

Courtesy of BMW OF NORTH AMERICA, INC.

Turn back screw (1).

Fig 2: Turning Back Screw

G03163922

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: special tool 11 7 394 is secured with a pin (2).

Fit special tool 11 7 394.

Insert screw (1) by hand until special tool 11 7 393 rests on sealing surface.

Fig 3: Inserting Screw By Hand Until Special Tool 11 7 393 Rests On Sealing Surface

G03163923

Courtesy of BMW OF NORTH AMERICA, INC.

Tighten down screw (1) by approx. a half to one turn.

Check sealing rings (1) and coat with water as anti-friction coating. Insert special tool 11 7 395 and tighten down.

Fig 4: Checking Sealing Rings And Coat With Water

G03163924

Courtesy of BMW OF NORTH AMERICA, INC.

Seal coolant apertures with special tool kit 11 7 390.

Fig 5: Identifying Special Tool Kit 11 7 390

G03163925

Courtesy of BMW OF NORTH AMERICA, INC.

Connect compressed air to special tool 11 7 395.

Fig 6: Connecting Compressed Air To Special Tool 11 7 395

G03163926

Courtesy of BMW OF NORTH AMERICA, INC.

Immerse cylinder head in a water bath. Inspection pressure 4.5 bar.

Check cylinder head for escaping air (cracks).

NOTE: If necessary, soften the bath water with a cleaning agent.