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Old 09-03-2010, 12:28 PM
Join Date: Apr 2008
Location: New Jersey
Posts: 39
Vacum pump failure

last night my vacum pump failed.
I pulled it apart today and one of the check valves on the bottom was broken. I removed all pieces except for a piece of metal that was broken and went somewhere in the engine.
This pump has the old bearing style and mercedes has updated the bearing to a solid one so engine failure won't occur.
After rebuilding this once and it failing, Mercedes says u need a new one for 300+ dollars.
The $40 rebuild kits are not available and You wouldn't want to risk having ball bearings in your motor.
What do you guys do?


1984 W123 300CDT
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Old 09-03-2010, 01:05 PM
Diesel911's Avatar
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Join Date: Sep 2007
Location: Long Beach,CA
Posts: 34,958
There is actually 2 rebuild kits. One for the Piston and Valves and another for the Bearing and Pivot Arm assembly that faces the Engine. Unless you shop around and find a place that sells both cheaply you will spend almost $300 rebuilding it yourself and have no warranty.

And then there is:
New Vacuum Pump Ruined due to too much Timer Shaft End Play (the title from my notes).
second vacuum pump, help! on a trip-Toronto

84 300D, 82 Volvo 244Gl Diesel
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