Quote:
Originally Posted by MB300Dave
OK, this is my issue, no vacuum, no breaks, no shut off.
Do I want a used one or rebuild my 294K pump? I don't really need a pump that will last another 30+ years, do I? What if I rebuild it & I mess it up?
What are your experiences?
Thanks,
Dave
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I would first remove/un-screw the Check Valve that is right under where the Main Vacuum Line screws into the Vacuum Pump and inspect it first. You don't need to remove the Vacuum Pump to do that.
When I had a sticking Check Valve I did not loose all of the Vacuum and it was fixed by hosing out the valve with WD-40 (don't use Brake Cleaner as there is plastic inside).
Others have had all of the parts in that check valve fall out and the Valve needs to be replaced.
Since you mentioned 30 Year + Pump I am guessing you have something close to My Year and Model;1984 300D.
As Hunter said take it apart and see if you can find a cause of the failure.
On the Piston Type Vacuum Pumps the Rebuild kits have gotten really expensive. If you want to replace the Piston Parts and the parts that face the Engine; the Arm and Bearing that will cost more then a whole new Vacuum Pump and if you do the rebuild yourself you have no warranty.
If you have an earlier diaphragm type Pumpe the Diaphram is cheap to fix. I guess the Arm and Bearing end is still expensive but you need to decide since if you did both the diaphragm is cheap.
A used Vacuum Pump would be an alternative.
Stretch also have some vacuum pump threads. In the one thread the Vacuum Pump innards are coated with thick sooty Oil. It could be a good cleaing of the inside parts would restore it till it gets sooty again.