1976 Mercedes 280 with Carburetor Trouble - Page 2 - Mercedes-Benz Forum

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post #11 of 26 (permalink) Old 02-06-2015, 10:19 AM
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Originally Posted by Baybear View Post
So what carb were they equipped with? Just wondering? Please educate me as I did not know carbs were used on later cars.
Will
Don't know, don't care, though I doubt it was the old Solex. The information is not classified, I'm sure you can look it up.

Felicita e un bicchiere di vino con un panino.
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post #12 of 26 (permalink) Old 08-15-2016, 05:29 AM
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W126 280S - Carburetor help required

WDB12602120027756

Guys I just bought a W126 1983 model with 60000 Kms only.
First owner who ordered it from Mercedes treated it with full due respect and didn't drive it much, saved it for me I guess
I feel honored and lucky to have found this and took me a year to convince him to sell it to me

Now that I have it I want it to be 100% like my other cars
it was heating up and I checked radiator was rusted and gone, immediately replaced it so heating problem is solved
it had minor oil seapage which I am in the process of fixing currently

my major concern is the carburetor in the car
Can anyone please firstly identify for me which exact model of carb is this and how can I overhaul it, it says PIERBURG on the carb but no ones talking about this brand anywhere (is my car the only one)
I have been searching for DIY thread for the same but everyones simple replace it and that is a scary thought as I want this car to be original
My carb also has seapage and if it stays start for a while then starts sending excess fuel to the back... (black smoke)
while running the car is excellent, no problem but yes as slow speeds and idle it definitely requires a tuneup
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Last edited by Zamanumer; 08-15-2016 at 05:34 AM. Reason: adding name of part
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post #13 of 26 (permalink) Old 08-15-2016, 06:27 AM
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Garage
Zamanumer

You should post your question over on the W126 forum. I suspect your carb is a Solex.
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post #14 of 26 (permalink) Old 08-15-2016, 09:57 AM
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Everyone in 126 forum has been suggesting all queries regarding carb engine should be shared in 116 or 123 forum as 110 engine came in these vehicles, hence more experience here.
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post #15 of 26 (permalink) Old 08-15-2016, 10:01 AM
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It says A4 on this side
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post #16 of 26 (permalink) Old 08-15-2016, 10:58 AM
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Good luck with trying to keep it "original". Rebuild kits are available for the carburetor (Solex 4A1 is the same unit) but 99.5% of the time the carb is warped beyond the repair abilities of 90% of most mechanics.

Proper realignment of the base plate and top cover requires you to have/make a jig, apply pressure, heat in an oven and that is still no guarantee you can reform them.

Pierburg 4A1 DB 250+BMW+OP

http://www.autohausaz.com/search/pro...s7MaAiQq8P8HAQ

Last edited by Mike D; 08-15-2016 at 11:01 AM.
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post #17 of 26 (permalink) Old 08-15-2016, 12:03 PM
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Thanks Mike
First link has a very detailed diagram
Really appreciate it
I will give it my best shot
With such low miles I'm hoping I have a chance of making it 100%
Fingers crossed

So incase this whole adding new kit doesn't work, what's the best solution ? What's the simplest upgrade
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post #18 of 26 (permalink) Old 08-15-2016, 02:05 PM
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The Holley conversion carburetor is the "easiest". I had one on my 280C before I switched to EFI. It allows you to use the stock air cleaner.

The Jam conversion 2 BBL kit is highly regarded by people who went that route. Can't use the stock air cleaner but I believe you can make/find an adapter which does allow it.

I've used; Holley square bore 350 CFM, Rochester Quadrajet, Autolite 2 BBL and an old 1 BBL from a early '60's era Buick six cylinder.

Any of those last listed require some modifications of linkages, fuel supply/return, choke set-up and water lines.
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post #19 of 26 (permalink) Old 08-15-2016, 02:09 PM
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The key to doing a successful rebuild on the Solex/Pierburg is to use an inch/pounds (or metric equivalent) wrench when assembling. It is very easy to over tighten the cover causing it to warp.

Last edited by Mike D; 08-15-2016 at 04:09 PM.
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post #20 of 26 (permalink) Old 08-15-2016, 08:51 PM
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Thanks
I'd be extra careful
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