Cylinder Head Assembly: Testing and Inspection

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





Special tools required:
- 11 7 390 11 7 390 Complete Pressure Testing Fixture
- 11 7 391 11 7 390 Complete Pressure Testing Fixture
- 11 7 392 11 7 390 Complete Pressure Testing Fixture
- 11 7 393 11 7 390 Complete Pressure Testing Fixture
- 11 7 394 11 7 390 Complete Pressure Testing Fixture
- 11 7 395 11 7 390 Complete Pressure Testing Fixture
- 11 7 396 11 7 390 Complete Pressure Testing Fixture
- 11 7 397 11 7 390 Complete Pressure Testing Fixture
- 11 7 398 11 7 390 Complete Pressure Testing Fixture

(cylinder head dismantled)





Prepare special tool kit 11 7 390 11 7 390 Complete Pressure Testing Fixture.

Note:
Special tool kit 11 7 390 11 7 390 Complete Pressure Testing Fixture consists of special tools 11 7 391 11 7 390 Complete Pressure Testing Fixture / 11 7 392 11 7 390 Complete Pressure Testing Fixture / 11 7 393 11 7 390 Complete Pressure Testing Fixture / 11 7 394 11 7 390 Complete Pressure Testing Fixture / 11 7 395 11 7 390 Complete Pressure Testing Fixture / 11 7 396 11 7 390 Complete Pressure Testing Fixture / 11 7 397 11 7 390 Complete Pressure Testing Fixture / 11 7 398 11 7 390 Complete Pressure Testing Fixture.

Place special tools 11 7 391 11 7 390 Complete Pressure Testing Fixture / 11 7 392 11 7 390 Complete Pressure Testing Fixture on cylinder head sealing surface and screw down with cylinder head bolts.





Turn back screw (1).

Note:
special tool 11 7 394 11 7 390 Complete Pressure Testing Fixture is secured with a pin (2).

Fit special tool 11 7 394 11 7 390 Complete Pressure Testing Fixture.





Insert screw (1) by hand until special tool 11 7 393 11 7 390 Complete Pressure Testing Fixture rests on sealing surface.

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 11 7 390 Complete Pressure Testing Fixture and tighten down.





Seal coolant apertures with special tool kit 11 7 390 11 7 390 Complete Pressure Testing Fixture.





Connect compressed air to special tool 11 7 395 11 7 390 Complete Pressure Testing Fixture.

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.