477619 Removing and installing vacuum pump

WM 477619 Removing and installing vacuum pump

Technical values





Information

A vacuum pump is used to provide the vacuum for the brake booster. This vacuum pump, together with the oil suction pump on the left cylinder head, is designed as a tandem pump -1-. It is driven by the exhaust camshaft on the left cylinder bank.





Overview of vacuum pump





Preliminary work

1. Remove rear underbody cover.





Removing cover for rear underbody

Replace fastening nuts -2- following removal.
-> 519419 Removing and installing rear cover 519419 Removing and Installing Cover for Rear Underbody

Removing vacuum pump

Removing

1. Remove the tandem pump.





Tandem pump

Release the vacuum line -2- and pull it off.
Screw out screws, see -Arrows- , and remove the tandem pump.

Information

When you loosen the fastening screws, engine oil will run out of the vacuum pump. Place a suitable container underneath to collect the emerging engine oil. The engine-oil level must be checked and topped up afterwards (following installation).

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Installing vacuum pump

Installing





Overview of vacuum pump





1. Clean contact surfaces.
Clean contact surfaces on the tandem pump -1- and left cylinder head.
2. Replace sealing ring.
Grease sealing ring -3- before fitting it.
Only use grease that has been approved for use on the sealing ring -3-. Details of approved products can be found in the Parts Catalogue.
3. Install the tandem pump.





Tandem pump

Align and insert driver for the tandem pump -1-.
Tighten screws, see -Arrows-.
Connect the vacuum line -2-.





Subsequent work

1. Start the engine to allow it to warm up and carry out leak test.
2. Check engine-oil level and top up engine oil if necessary. -> 170101 Checking engine-oil level 170101 Checking engine oil level
3. Install rear underbody cover -> 519419 Removing and installing rear cover 519419 Removing and Installing Cover for Rear Underbody.





Cover for rear underbody

Replace fastening nuts -2-.