Removing and Installing Vacuum Pump

WM 477619 Removing and installing vacuum pump





Information

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

1 - Tandem pump
2 - Screws
3 - Sealing ring

Preliminary work
1. Remove rear underbody cover.

Replace fastening nuts -2- following removal.





Removing cover for rear underbody

Removing vacuum pump

Removing
1. Remove the tandem pump.

Release the vacuum line -2- and pull it off.

Screw out screws, see -Arrows-, and remove the tandem pump.





Tandem pump

Information
When you loosen the fastening screws, engine oil will run out of the sucking jet 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).

Installing vacuum pump

Installing





Overview of vacuum pump

1 - Tandem pump
2 - Screws
3 - Sealing ring

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.

Align and insert driver for the tandem pump -1-.

Tighten screws, see -Arrows-.

Connect the vacuum line -2-.





Tandem pump





Subsequent work

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.
3. Install rear underbody cover.

Replace fastening nuts -2-.





Cover for rear underbody