ive searched archives about rebuilding my pump,but didnt see my specific model.my pump has one large main line at pump to brake booster with a plastic clear line feeding all the doors ,cruise ,shutoff etc.is this pump different than most and is it rebuildable in car without taking out radiator?what about removal whats involved ?

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95 e320,87 sdl,79 300sd

Mine's like that too. I have a vague recollection of a thread on that pump from a few years ago. My impression from that thread was that it was rebuildable in situ but it's been a while.
Did some searching but couldn't find the thread I had in mind. I'm wondering if 2 rebuild kits from the early single diaphragm model could be used to rebuild the double diaphragm model? If so, I know the single diaphragm model is rebuildable in situ but that diaphragm faces forward. The SD double diaphragm model faces up and down but I don't see who the two diaphragms couldn't be removed with the pump itself in place. Might be a little difficult to remove the cover over the bottom diaphragm.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

thanks for the research-so if it has to come out,do you need take radiator out and hose off of ps pump?

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95 e320,87 sdl,79 300sd

Not sure. Radiator does not need to come out to remove pump or cover on a 617 in a 77 123 model.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

rebuild kit according to phil is 275$,new pump from mercedes is 1500$,other option according to sun valley dismantlers isto use an 82 vac pump and they modify cover plate for injection pump timing gear? something like that ,that costs 125.i love this car and will probably go with used as old pimp still uses piston new one diaphragm.

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95 e320,87 sdl,79 300sd

i took pump out this afternoon,removed fan,shroud,upper radiator hose and power steering belt,theallen screws around vac pump are hard to get to,luckily mine were all fairly loose,but its gonna be a lot of fun getting them back in,phil found me used pump,new is so expensive and now ive got old one to rebuild if this one goes.

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95 e320,87 sdl,79 300sd

Do you think it could be rebuilt in place?

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

no this particular pump has 2 diphragms, top and bottom and the bottom one is not accessible unless you take it out of car.i think they made this pump only for a few years.rebuild kits are expensive-all the info is on http://www.w116.org/ website-they have manual on line with info on rebuildng and removal of pump.there are no aftermarket pumps avaialbel that i can find,but used ones are available.-

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95 e320,87 sdl,79 300sd

rosenfe, I looked on the 116 website and didn't find the part about the vacuum pump. Can you help a brother out? Thanks!

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"Opportunity is missed by most people because it is dressed in overalls and looks like work" - Thomas Edison-
1979 300SD
1975 450SL
2014 Ram Cummins Megacab (tow rig)

go to library follow steps to 300sd then go to chassis and body ,it first will go to brake booster,hit more arrow and you will see vacuum pump info.also on their forum under mechanicals you should see my post about vac pump, and the response from a member guiding me through their library.


good luck

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95 e320,87 sdl,79 300sd

You have e-mail.
Call me with any questions.




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