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Old 03-07-2003, 08:08 PM
Posts: n/a
replacment diaphrams for vaccuum locks on w123

does anyone know where to get diaphram kits ?
my mechanic showed me a set, but when we called M-B we were told that they were no longer sold and that you had to buy the entire actuator. (~$30.00) Even Tom Hanson says that you must buy the whole unit. The car is a 1985 300td, and the locks no longer lock centrally. This is ok, but the leaking unit is taking the system down somewhat, affecting shifting, turbo wastegate too I think. Anybody ever heard of these kits??
thank you
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Old 03-07-2003, 08:54 PM
sixto's Avatar
smoke gets in your eyes
Join Date: Jun 2000
Location: SF Bay Area
Posts: 20,791
Have you asked Phil? Do a text search on George Murphy.

91 300SE
87 300SDL
83 300SD
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Old 03-07-2003, 09:13 PM
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Happy now in paradise!
Join Date: Nov 1999
Location: Venice, FL - "sharktooth capital of the world"
Posts: 712

He has a company called Performance Analysis Company. He also sells ACC blower brushes. He will send you a catalog of his stuff also.
85 300D 310K (sold)
90 350SDL 184K sold
83 300D 118K (sold)
88 300E 153k (sold)
93 400E 105K (sold)
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Old 03-07-2003, 10:22 PM
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Join Date: Mar 2002
Location: S.F. Bay Area
Posts: 502
Vacuum repairs


Do a search on the vacuum repairs. Some where I've seen a thread where the threadee used condoms to over lay the original vacuum diaphram and it worked. Mind you, you could always replace the newer ones with the older models that had replaceable rubber parts and they are available from Capitol West on the intenet for about five dollars each. While I've never purchased one, condoms have to be cheaper than buying the whole unit!

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Old 03-08-2003, 12:15 AM
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Posts: 131
Try this site:

Good luck


1985 300D Turbo
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Old 03-08-2003, 12:17 AM
Senior Member
Join Date: Jan 2003
Location: kansas
Posts: 100
i have some of the old style "round" diaphrams for the older cars, but yours should have the sealed plastic actuators, which are non servicable. pm me if you want these i have
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Old 03-08-2003, 09:28 AM
Posts: n/a
Thank you all. Good information!
I read somewhere that before you close up the door, when replacing the vaccuum element, coat it with some silicone lub to help it live longer. Has anybody else heard this?
thanks again

1985 300td 100217
1985 300cd 115891
1991 560sec 77450
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Old 03-08-2003, 09:31 AM
Posts: n/a
recent George Murphy email address

I tried the compuserve address in the postings above, the message was returned.
Is there a new address?
thank you
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Old 03-08-2003, 10:18 AM
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Join Date: Jan 2002
Posts: 18,355
Using both a diaphragm and a condom seems like overkill to me.
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
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Old 03-08-2003, 11:57 AM
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Join Date: Feb 2002
Location: SF Bay Area
Posts: 131
Yes, using silicon lub will prolong the life of the vacuum element.
It will prevent the rubber parts from drying up, causing cracks.


1985 300D Turbo
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