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

WARNING: This page is about a different car, the 2005 BMW Z4, 2004 BMW Z4, and 2003 BMW Z4. However, it is still accessible from the selected car via links, so may be relevant.

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 Special Tools On Cylinder Head Sealing Surface

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Turn back screw (1).

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

Fit special tool 11 7 394.

Fig 2: Installing Special Tool

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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: Tightening Down Screw

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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

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Seal coolant apertures with special tool kit 11 7 390.

Fig 5: Sealing Coolant Apertures With Special Tool

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Connect compressed air to special tool 11 7 395.

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.

Fig 6: Connecting Compressed Air To Special Tool

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