Special tools required:

WARNING: This page is about a different car, the 2003 BMW 525i, 2002 BMW 525i, and 2001 BMW 525i. However, it is still accessible from the selected car via links, so may be relevant.

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 / 117 392/ 11 7 393 / 11 7 394 / 11 7 395 / 11 7 396 / 11 7 397 / 117 398.

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: Identifying Back Screw

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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: Inserting Screw Until Special Tool 11 7 393 Rests On Sealing Surface

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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: Identifying Sealing Rings

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Seal coolant apertures with special tool kit 11 7 390.

Fig 5: Sealing Coolant Apertures With Special Tool Kit 11 7 390

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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 11 7 395

Courtesy of BMW OF NORTH AMERICA, INC.