I have a major vacuum leak. I think it is the driver's side back door locking mechanism. When I look it up on Fastlane all I see is a vacuum element for $62. I assumed all I would need is a rubber diaphragm of some kind. That seems a little steep for a piece of rubber. Does anyone know if it can be fixed with a diaphragm and a source for it? Or, do I need to spring for the whole vacuum element at that price?

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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

I thought that someone said they could get them from the dealer for about ten bucks...

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'99 S420 - Mommies
'72 280SE 4.5 - looking to breathe life into it
'84 300SD Grey - Sold
'85 300SD Silver - Sold
'78 Ski Nautique

Kerry

I know you can get replacement diaphragms for the older ones the newer ones you must replace the whole actuator, or do the condon fix, what year are you talking about?

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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"

George Murphy (use search for phone) or http://www.autoluxmbz.com/

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The Golden Rule

1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)

85td

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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

"85td"

Ya, I think those are not fixable.

Steve

well, i've got similar problems...leaks with the little conical rubber coverings that seal the actuator to it's shaft. after much research, i've discovered they WERE available separately (part # is 123 800 00 09), but mercedes will no longer sell 'em to you. if ANYBODY's got a source on these, or a good fix (substitution fabricated part) , please lemme know!

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-lee
'83 300CDT (286k)

former proud owner of:
'85 mercedes euro 300TD
'80 mercedes 300TD
'77 mercedes 280e
'80 mercedes euro 250
'82 mercedes euro 250

Check out the bone yards, in the mean time use golf tees to plug the vac lines so you can lock and unlock the system.

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If it ain't broke take it apart and find out why.

1983 300SD, 4 speed
1994 C280
1987 300TD wagon
1996 HD Road King

Ride in Peace Eric Peterson, Harley of Macon

I just pulled 3 out of a boneyard- one older-stock- unit, and 2 bosch? units which were rigged in by mig welding a 2" stove bolt to the end of the lock shafts on the car they were in.

i used the stock one to fix my car, but I'd be willing to part w/ 1 of the others for a fair price, if you have the ability to weld.

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1984 123.193 372,xxx miles, room for Seven.

1999 Dodge Durango Cummins 4BTAA 47RE 5k lb 4x4 getting 25+mpgs, room for Seven.

www.************************ has them listed, I have purchased for my 77 300D, they show for wagons thru some number.
Ron

This seemed like a good thread to add my pics from the job I did today. Had shutoff issues AND the door locks would not work. ['85 300TD]
Well, as luck would have it, I have a leak in both the climate vac system and the door lock vacuum.
I always start under the drivers carpet, where the lines come from the door lock valve. Yellow/red is lock, yellow/green is unlock.
I hooked Mityvac to y/r to valve and it held. Same with y/g and it held [with door lock button moved from previous test]. Both positions of door lock valve held vacuum, so I new problem was not the valve but was further in the car.
Under carpet, left edge, are the two lines from this valve. The Y/R goes into a 1 to 2 splitter, and sends vac to back driver's side door through one, and over to passenger side for the rest of the car. Same with y/g.
As "luck" would have it, my leak was in driver's side rear door. Had it been elsewhere, I would have gone under passenger carpet and chased it from there.
This wagon has much newer style door lock vacuum actuators than some of my other ones have had. Like a post above, the diaphram on the top shaft was torn. It was difficult as I had to do some custom bending, but I installed an older style unit from my parts stash.
Works fine, and the door locks work quickly, and even work 6-8 times at least after car is turned off. Very cool, and an enjoyable day of fixing something.....

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Jimmy L.
'05 Acura TL 6MT
2001 ML430 My Spare

Gone:
'95 E300 188K "Batmobile" Texas Unfriendly Black
'85 300TD 235K "The Wagon" Texas Friendly White
'80 240D 154K "China" Scar engine installed
'81 300TD 240K "Smash"
'80 240D 230K "The Squash"
'81 240D 293K"Scar" Rear ended harder than Elton John