Checking Cylinder Head For Watertightness

WARNING: This page is about a different car, the 2003 BMW 530i, 2002 BMW 530i, and 2001 BMW 530i. However, it is still accessible from the selected car via links, so may be relevant.

Cylinder head dismantled, refer to 11 12 503 DISASSEMBLING AND ASSEMBLING CYLINDER HEAD (M52/S52/M52TU/M54/M56) .

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: Fit Special Tool 11 7 394

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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 On Special Tool

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Check sealing rings (1) and coat with water as anti-friction coating. Fit special tool 11 7 394 and tighten down.

Fig 4: Install Special Tool 11 7 394 To Opening

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Seal coolant apertures with special tool kit 11 7 390.

Fig 5: Sealing Coolant Apertures With Special Tool Kit

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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: Checking Cylinder Head For Water Tightness

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