Checking Vacuum Pump

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Expose the secondary load connection of the vacuum pump -5- . Different preliminary work is required, depending on the model and equipment variant.

Fig 1: Identifying Vacuum Pump Components
Courtesy of PORSCHE CARS NORTH AMERICA, INC.
1. Vacuum pump
2. Screw, M6 x 25
3. Sealing ring
4. Sealing ring
5. Secondary load connection
Connect vacuum gauge tester 9160/1 to the secondary load connection.
Set vacuum tester to Vacuum position (lever set to Open).
Start engine and leave it running at idle speed with slightly changing revs.
The vacuum pump must create a vacuum of at least 500 mbar or 0.5 bar.
If the vacuum is not maintained, i.e. the pointer moves towards 0 bar, the vacuum pump is faulty. Replace vacuum pump. → 477619 REMOVING AND INSTALLING VACUUM PUMP
This defect can cause engine oil to get into the vacuum system. In this case, the lines and switching valves must be checked visually and replaced if necessary or cleaned with solvent naphtha.