W111 Zenith Carburetor Adjustment Help - Mercedes-Benz Forum

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post #1 of 14 (permalink) Old 02-28-2014, 10:00 AM Thread Starter
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W111 Zenith Carburetor Adjustment Help

Hi there!
I am in need of an adjustment guide for my Zenith twin carburetor. I guess it's a 35/40 INAT model sitting on my 1964, 220sb. Any help or link finding an adjustment manual is highly appreciated.
Thanks!
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post #2 of 14 (permalink) Old 02-28-2014, 10:51 AM
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A basic thing to check is that the two carbs draw air in equal amounts. A synchrometer will help with this, but you will likely need some kind of flange adapter to fit correctly. You can adjust the air volume via the idle control screw on each carburetor. Make sure to disconnect the linkage between the two when doing this.

If the carbs are drawing air equally, but idle is unstable, there's likely an air leak somewhere, which is compromising the air/fuel mixture. This can have several causes, but a carb rebuild could be required. Not too difficult with those carburetors.
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post #3 of 14 (permalink) Old 02-28-2014, 11:38 AM
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post #4 of 14 (permalink) Old 02-28-2014, 08:58 PM
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In addition to the manual you will require a carb synchronizer. (jcwhitney etc carry them)

Once you have set them up and balanced they work very well in these models.
I have found them to be perfect for these models ,occasionally they will get warped surfaces due to a overheated engine.

Fitted to period BMW's too and kits available from them.
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post #5 of 14 (permalink) Old 03-01-2014, 05:59 AM
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It's not obvious in the adjustment instructions, but you balance using #12 idle speed adjustment - on the vertical linkage, and adjust mixture with #15 idle mixture screw on the side of the base, per the instructions.
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post #6 of 14 (permalink) Old 03-01-2014, 09:21 AM Thread Starter
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Thanks for the reply! Good start...
However, I was wondering the actual model of the Zenith. Is this a 35/40 ? or...
The Chassis number is 111012-10-128179 and Engine number 180941-10-115763
Thanks again!
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post #7 of 14 (permalink) Old 03-01-2014, 07:28 PM
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35/40 INAT.
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post #8 of 14 (permalink) Old 03-02-2014, 10:18 AM
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FWIW, It's worth checking all the jet sizes if you have or think you have a carb that has been replaced. Zenith were used on many MB and BMW models and all have different jet specs.
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post #9 of 14 (permalink) Old 03-02-2014, 05:33 PM
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I have a real crap box 1971 250 m130 that is just got running today, and assume the carb will require a rebuild. I'm in the Philadelphia area and will probably be following your path. Maybe some tool sharing? If I get ahead of you I will be sure to let you know. (Some zenith manuals seem to be in one of the sticky threads.)


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post #10 of 14 (permalink) Old 03-04-2014, 09:16 AM Thread Starter
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Hi Fonzi,
I noticed the manual found on this page is quite interesting and a step by step guide will ensure a good result at the end.
Zenith Carb Manual TOC

I got a rebuild kit (original Mercedes part A 000 586 01 07) from a local Benz dealer. You should be able to get one on ebay or so...
Will keep you inform...
Cheers!
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