Preliminary Work
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Information
- Photos taken with a digital camera are helpful for dealing with complicated line routing (engine wire harness).
- For details, see WM, 975219 REMOVING AND INSTALLING ENGINE WIRE HARNESS
- Remove chain housing cover.
> WM, 153319 REMOVING AND INSTALLING LOWER CHAIN HOUSING COVER (V8 BITURBO) or WM, 153319 REMOVING AND INSTALLING UPPER CHAIN HOUSING COVER (V8 BITURBO)
- Only for cylinders 5-8: Remove vacuum pump.
- Remove pressure pipes.
- Remove guide for oil dipstick.
- Loosen tank ventilation sensor (USA) or dummy (cylinders 1-4) -1-
.
- 5.1 Unscrew and remove fastening screw -2- .
- 5.2 Release and disconnect electric plug connection -3- .
- 5.3 Loosen tank ventilation sensor (USA) or dummy -1- together with vent line -5- from holder -4- .
Tank ventilation sensor (cylinders 1-4)
- Loosen change-over valve for water pump -3- and remove holder.
Vacuum system
| 1 | Brake booster vacuum pump |
| 2 | Vacuum line |
| 3 | Electric change-over valve for water pump |
| 4 | Control valve for boost pressure control, cylinders 1 to 4 |
| 5 | Control valve for boost pressure control, cylinders 5 to 8 |
| 6 | Brake booster connection |
| 7 | Vacuum unit connection |