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

WARNING: This page is about a different car, the 2002 BMW Z3 and 2001 BMW Z3. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

For Special Tool identification, see SPECIAL TOOLS - Z3 .

Special Tools Required:

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

(Cylinder head dismantled)

Prepare special tool kit 11 7 390.

NOTE: Special tool kit 11 7 390 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: Placing Pressure Testing Fixture On Cylinder Head Sealing Surface

G03177957

Courtesy of BMW OF NORTH AMERICA, INC.

Turn back screw (1).

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

Fit special tool 11 7 394.

Fig 2: Securing Pressure Testing Fixture With Pin

G03177958

Courtesy of BMW OF NORTH AMERICA, INC.

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

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

Fig 3: Fastening Pressure Testing Fixture To Cylinder Head

G03177959

Courtesy of BMW OF NORTH AMERICA, INC.

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

G03177960

Courtesy of BMW OF NORTH AMERICA, INC.

Seal coolant apertures with special tool kit 11 7 390.

Fig 5: Sealing Coolant Apertures With Pressure Testing Fixture

G03177961

Courtesy of BMW OF NORTH AMERICA, INC.

Connect compressed air to special tool 11 7 395.

Fig 6: Connecting Compressed Air To Pressure Testing Fixture

G03177962

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.