My 75 240d has been sitting in storage over the winter. I've been itching to get back to driving it. Anyways before parking it I was fighting with the idle speed. Sometimes it would idle at 1100 rpm, and other times way higher and lower. Car runs great otherwise. Spent a lot of time trying to adjust linkages without luck.

Tried seeing if the IP diaphragm would hold a vacuum... With my mittyvac attached to the back of IP I couldn't get it to hold any vac. Guessing the diaphragm is shot and causing my idle issues. I've read posts on the forum concerning this issue. However I can't seem to find a place to buy one.

Does anyone know where to buy one? I also read info that it must be set up properly to work. Should I just be looking for a 'new' pump? I'd love to attempt to fix this myself, but..

Thanks in advance. Hope to get on the road soon.

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Dave

1985 190D 2.2 auto--gone
1975 240D 4-speed--storage
1985 500SEL--daily driver
1985 300TD--bad rust, soon to part out...
1982 300SD--waiting on engine from RD
1984 190E--storage
1996 Dodge 2500 Cummins--daily driver

MB still stocks them. $75 or so.

Contact Phil.

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1974 240D "Boldie" 170K.- New timing chain/freshly rebuilt IP/replaced valve seals/injectors/upgraded stereo/new Bilsteins with Yokohamas/fresh paint and rocker panels plus lots of welds.

Governor Diaphragm Test
74 240d Grey smoke questions

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84 300D, 82 Volvo 244Gl Diesel

I was under the impression from a recent thread that MB didn't have them anymore.

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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

Is it part # 1 420 503 030 ??? IF so, I think I might have one left and I can do much better on the price. Give me a few days to get some other parts shipped and I will post a pic:

I had 2 of these in my NOS parts:
FS --- daw's mega new old stock (NOS) parts

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daw_two
Germantown, TN

Links:
Sold last car --- 05/2012 1984 300D Light Ivory, Red interior
Cluster Needles Paint
New Old Stock (NOS) parts

Past:
3/2008 1986 300SDL "Coda"
04/2010 1965 190D(c) "Ben"
& many more

FYI, it might not be the diaphragm that's bad.

I had my IP rebuilt a few months ago at the urging of the local indy. It turns out that my diaphragm was in decent shape, but the bearings and seals on the poppet cam were worn. Either will cause a vacuum leak and related smoking issues.

I don't know how you'd isolate that with the IP still on the car, but perhaps someone else does.

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1974 240D "Boldie" 170K.- New timing chain/freshly rebuilt IP/replaced valve seals/injectors/upgraded stereo/new Bilsteins with Yokohamas/fresh paint and rocker panels plus lots of welds.

Douse the poppet cam axle in oil whilst the engine is running. If you hear the rpm dropping, it is the axle.

Thanks for the replies. I'm probably going to buy a new diaphragm. If it something else i suppose it won't hurt to replace the original. Is the poppet cam the lever on the rear of ip hooked up to a linkage? I don't have access to the car right now so I can't test that out yet.

Btw email sent to Daw_two.

__________________
Dave

1985 190D 2.2 auto--gone
1975 240D 4-speed--storage
1985 500SEL--daily driver
1985 300TD--bad rust, soon to part out...
1982 300SD--waiting on engine from RD
1984 190E--storage
1996 Dodge 2500 Cummins--daily driver

The diaphragm needs to be change with the aid of a dial indicator to set the compensation path.

The poppet cam is indeed the lever on the rear of the IP.