I have an 83 Mercedes 300 DTurbo. I am working on joint door lock and slow shut off issues that occur at the same time. The vacuum switch on the ignition is oily. The pump seems to give a consistent 19 inches of vacuum. I would imagine that it needs rebuilding but want to verify before going to the trouble

Thanks

Ben

not necessarily, but if the pump itself is only putting out 19 mmHG directly (no other components connected) then it may be tired). fresh ones put out 23-25mmHg

oil in that ignition lock indicates a faulty vacuum shut-off valve on the back of your IP. that explains the slow shut off and your other vacuum ailments.

youre lucky! thats an easy one. do a search, JimmyL posted the DIY I referenced to replace mine. 1 hour job...

Heres the part:
http://catalog.worldpac.com/mercedesshop/sophio/quote.jsp?clientid=catalog.mercedesshop&cookieid=2730TGOG129Y18YOEV&baseurl=http://catalog.peachparts.com/&partner=mercedesshop&year=1983&product=D2020-11537&application=000004561

You also need TWO of these:
http://catalog.worldpac.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=2730TGOG129Y190CVY&year=1982&make=MB&model=300-DT-001&category=All&part=Shut+Off+Valve+Gasket

I also think its fair to say that you can purchase another brand's part at a fraction of that price on other sites.

you also need to do a good job and clean out the oil from all the vac lines and make sure it hasn't gotten into other places like the brake booster.

good luck,
dd

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'85 300D, 'Lance',250k, ... winter beater (100k on franken-Frybrid 3 Valve Kit)
'82 300D, 'Tex', 228k body / 170k engine ... summer car
'83 300TD Cali Wagon 210k, wife's car