Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help

Go Back   PeachParts Mercedes-Benz Forum > Mercedes-Benz Tech Information and Support > Tech Help

LinkBack Thread Tools Display Modes
Old 09-27-2003, 04:56 PM
Registered User
Join Date: Sep 2003
Posts: 187
Where does the oil in the vaccum line come from?

1980 300 td with a later model engine and turbo, i think it said 617. somthing on the block
after doing many searches i could not find the answer
so here is the problem, oil in all ACC vacuum lines, oil in vaccum line at the ignition, but not at the fuel shut off valve, no oil in brake booster line, locks just recently stoped working, engine shuts off slowly( but i by passed the ignition and it shuts off quick) no suction to the black line that turns on the heater valve. wher does this oil come from and what do i need to do to fix it?
i inspected the vacuum pump and could only find one line coming out of it, it is on the top about 1/4 inch and metal, i figure this line does the suction, so if the pump is bad where does the oil come from.
any help or suggestions on what to look for would be great. thanks

Reply With Quote
Old 09-27-2003, 08:31 PM
jbaj007's Avatar
Registered User
Join Date: Jun 2001
Location: Santa Monica, CA
Posts: 2,053
The oil comes from the engine lube channels for the vacuum pump arm and (in your case) thru the broken pump element and then thru the line. Repair kits available at Fastlane above. Check your shut off valve, also.
The Golden Rule

1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)
Reply With Quote
Old 09-27-2003, 08:39 PM
Registered User
Join Date: Sep 2003
Posts: 187
thanks for the reply, i will do more serching on the engine lube channels, but i may as well ask before. after looking more i found that i have the piston air pump. i know there is the one tube that has the vaccum, but where and how are the engine lube channels connected to the a/c vaccuum lines? boy, this stuff just keeps getting mor complicated!! i did check the fuel cut off element ( is that what it is called?) the one that is on the fuel pump, and once i hooked up a line that "T's" off the brak booster line it shut right off.
thanks again
Reply With Quote
Old 09-27-2003, 09:10 PM
Registered User
Join Date: Jan 2001
Location: Tucson, Arizona
Posts: 758
Vac Diaphragm leaking


If you will do a search using my user name you will find all my posts on my '80 300TD vac pump diaphragm change out and how it fixed the oil usage problem. The parts can be bought through Fastlane for less than $20 and the fix is sure worth it.


"Tell me and I will listen, Teach me and I will learn, Show me and I will accomplish, Involve me and I will succeed."
'84 300SD 256,000 Gold on Brown (Mileage Award)
'86 300E 246,000 Blue on Tan
Reply With Quote


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On

All times are GMT -4. The time now is 10:35 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page