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Old 08-16-2001, 01:03 PM
Wm. Lewallen
Posts: n/a
Door lock vac pump repair

Is there an easy/cheap way to repair a door lock vac motor for 1983 Mercedes Benz 300SD (motor located in trunk with spare tire)? Part #126 800 0348 (Hella motor)
Bill Lewallen
Lexington, KY
Home of fast horses, dumb asses, and a few smart asses.

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Old 08-16-2001, 01:17 PM
Posts: n/a
Sorry, I don't have an answer for your post, But I just wanted to say hello to a fellow Lexingtonian. I didn't know if there were any others from Lexington on here or not.
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Old 08-16-2001, 01:48 PM
SW SW is offline
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Join Date: Aug 2000
Location: Houston, TX. USA
Posts: 590

What's the problem with your vac system? I almost replaced the pump on my father's '82 SD last week. But MB Doc had some good words of advice and I found the system to be leaking and the pump to be OK. Maybe yours could be a similar problem, that pump is too expensive.

2001 Dodge Ram 2500 Cummins Turbo Diesel - 4x4, auto, 3.54 gears, long bed
'92 300D 2.5 Turbodiesel - sold
'83 300D Turbodiesel - 4 speed manual/2.88 diff - sold
'87 300D Turbodiesel - sold
'82 300D Turbodiesel - sold
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Old 08-17-2001, 02:06 PM
Wm. Lewallen
Posts: n/a
I have checked my pump with one on another car. My pump works only one way-I forget if it's lock or unlock--
Price for a new pump from disc. auto store-$200. Dealer price+$280. Anyone have a cheaper price?
Bill Lewallen'Lexington,Ky.
Home of fast horses.
No more smart asses...
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Old 08-17-2001, 02:59 PM
longston's Avatar
Another View. . .
Join Date: Dec 2000
Location: Mark West, CA
Posts: 787
Bill, That Part Number Is Out Of Date...

The new Mercedes # is 000 800 03 48, and you will also need the new cover, # 126 805 03 90. The old one will not fit the new pump. My local dealer lists the pump for $394, & the cover for $22.

FastLane has the goods...

Bosch Part # O4000-27217
Bosch Vacuum Supply Pump

List - $376.00
FastLane - $198.59

# O4002-87088
Vacuum Pump Cover

List - $17.00
FastLane - $15.81
"We drive into the future using only our rearview mirror."
- Marshall McLuhan -

Scott Longston
Northern California Wine Country...
"Turbos whistle, grapes wine..."
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Old 08-17-2001, 06:00 PM
Registered User
Join Date: Aug 2000
Posts: 269

If your pump produces vacuum and the locks function one way your problem is almost certainly not with your pump. The pump only produces vacuum on demand and doesn't do anything different to lock or unlock. Look to the valves, actuators, and tubing. I'm betting you have a torn diaphragm in one actuator.

Bob D.
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Old 08-18-2001, 02:48 PM
Aaron's Avatar
Join Date: Aug 1999
Location: Cincinnati, Ohio
Posts: 1,937
A good friend of mine lives in Winchester (about 12 mi East of Lexington). He has a small "by appointment only" MB shop out there. I bought my '70 280SE from him and am about to go down there again and pick up a '70 280SL and an '87 300TD. I love horse country. Whenever I'm down there, we always make two stops, one to the Liquor Barn for some good German beer and also at the MB dealership (James), we then usually jump in our cars (the last time he was driving his '83 500SL Euro and I was in my '77 450SL) and take a fast winding tour through horse country! It's beautiful!
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Old 08-18-2001, 05:07 PM
Join Date: Jul 2001
Location: Woolwich, Maine
Posts: 3,598
I would agree that if the motor runs at all in the pump, then the problem lies elsewhere in the system. I had the motor stop owrking on my 190E 2.3-16 and was about to order a new one when the parts supply salesman suggested I run a wire from the battery to the unit and see if it worked. The pump worked. They very rarely fail, and the rest of the vacuum operated clap trap by comparison is kind of flimsy. Mine turned out to be a bad connection (electrical) under the rug on the driver's side just below the clutch. Took some doing to find it but the fix was free.

Finding the problem in the vacuum system can be a pain in the rear, but you can dope it out. Good Luck. Jim
1986 Euro 190E 2.3-16 (291,000 miles),
1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000,
1988 300E 5-speed 252,000 miles,
1983 240D 4-speed, purchased w/136,000, now with 222,000 miles.
2009 ML320CDI Bluetec, 89,000 miles

1971 220D (250,000 miles plus, sold to father-in-law),
1975 240D (245,000 miles - died of body rot),
1991 350SD (176,560 miles, weakest Benz I have owned),
1999 C230 Sport (45,400 miles),
1982 240D (321,000 miles, put to sleep)
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Old 08-18-2001, 05:55 PM
Wm. Lewallen
Posts: n/a
Thanks for all the replys;
The parts house I get my MB parts from in Atlanta has the pump I need(#126 800 03 48) Price$199. 99 The MB salvage yard in Falmouth,Ky. has a used one. He will install it and check the door lock system for $75. A friend and I will be going to Mike's Mon..
This guy has over 400 acres and more than 600 MBs.
Since the pump from my car would not work on an identical car,I assume my pump is bad.. We shall find out Mon. I will keep all of you posted on the outcome.
Bill Lewallen; Lexington,KY.
Home of Valvoline--maker of MB antifreeze (XEREX)??
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Old 08-21-2001, 02:49 PM
Wm. Lewallen
Posts: n/a
The problem of the vacuum door lock system on my 1983 300SD has been solved and fixed. My pump was bad and replaced with a used pump and matching case. No vac. leaks. Cost: $100.
This guy in Falmouth, Ky. has over 600 salvageable MBs. If you need parts(new/used), you might want to contact him: EUROPEAN CONNECTIONS
313 Main St.
Falmouth,Ky. 41040
To those that wanted the place for turbo parts, that address is;
M&D Distributors
6931 Navagation Blvd.
P.O. Box 9488
Houston,Texas 77261
Bill Lewallen;Lexington,Ky.
Home of Jif Peanut Butter !!!!!

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