Welcome! Please use the navigational links to explore our website.
PartsASAP LogoCompany Logo (800) 853-2651

Shop Now

   Allis Chalmers Case Farmall IH Ford 8N,9N,2N Ford
   Ferguson John Deere Massey Ferguson Minn. Moline Oliver

Attention Forum Users: On the 28th of December 2023 at 9:00am Central Time, we will be taking the forums down for maintenance while we prepare the new forums for your use. Please click here for more information.

Discussion Forum
:

Sputtering B and a MS Carb

Welcome Guest, Log in or Register
Author 
Matt Campbell

04-19-2001 05:53:03




Report to Moderator

I'll try not to make this too long, but got several questions.....

Just got done putting a new manifold gasket on the B I just bought. Prior to doing this, when going up an incline/hill, she just would start sputtering, as if she was getting too much gas or not enough. I noticed it was leaking pretty bad at the manifold, so I thought it'd be an easy thing to fix and see what happens. Well, got it started yesterday and its still happening, maybe even worse even when not going up a hill. It'll idle sitting still just fine. Now, onto the carb: It's a Marvel-Schebler, and according to everything I've read, it should have a Zenith. Can anyone tell me if 49' B's came with MS carbs too? My next plan is to take the carb off and see if it's dirty or ???? to determine if it's causing the sputtering. The carb does seem to be getting too much fuel to the engine as it's pretty easy to flood it when trying to start. Once it got it started yesterday though, it started back up several times with ease, even after running it for a while. I can only see two adjustment screws on the carb. A big one, and a small one. Which one is which? Of course, my IT manual doesn't say.

I have cleaned the plugs and the points, and sanded the contacts on the cap and rotor. Checked the gaps, etc.....

Any tips or thoughts? This is my first tractor so I'm learning..... ..I know there's lots of questions here, but the main thing is just the sputtering.

Thanks, Matt

[Log in to Reply]   [No Email]
Dave in Mo

04-20-2001 05:16:43




Report to Moderator
 Re: Sputtering B and a MS Carb in reply to Matt Campbell, 04-19-2001 05:53:03  
On all my tractors, I just rebuild the carbs with the kits. They cost about $25 and when you're done, you've eliminated that problem for a long time. The kit will have instructions on how to set the few items in there and the old tips about using welders wire to clean out all the passages in the bowl castings are good. Kits for the MS can be bought online or even at the local Home and Farm stores sometimes.

[Log in to Reply]  [No Email]
Matt

04-20-2001 05:03:59




Report to Moderator
 Re: Sputtering B and a MS Carb in reply to Matt Campbell, 04-19-2001 05:53:03  
Thanks guys for the tips. I should have mentioned that I did clean the sediment bowl and put an inline filter on when I did the prior work to the manifold gasket. So, last night I took the carb off and cleaned it. I saw no dirt in the carb at all, which surprised me because there was sediment in the bowl when I cleaned it earlier last week. Anyway, tried to start it last night w/o any luck. I'll try again this morning. How do you adjust the float? Do you just bend it? My years with VW's, I've never had to do this, because they just work and occasionally need replaced. Of course, this is no VW, but seems as simple. Also, thanks for the info on the MS carb. Atleast now I know which screw is which. Concerning smoke, it indicated that its running rich, because the smoke is blackish-gray. Also, the plugs indicate a rich mixture.
I'll let you know how it goes today. Hopefully the rain will let up and give me a chance to work on it.

Matt

[Log in to Reply]  [No Email]
Tom

04-20-2001 17:43:05




Report to Moderator
 Re: Re: Sputtering B and a MS Carb in reply to Matt, 04-20-2001 05:03:59  
I forgot to say, you adjust the float (the proper way anyway0 by putting different thickness shims (the gasket) under the needle seat. I filed the fiber one down to get the adjustment on mine. This is the way the AC repair manual says to adjust it. You may need to find thicker gaskets (the washerunder the needle seat) in order to be able to file it the the right float level.



[Log in to Reply]  [No Email]
Phil auten (TX)

04-19-2001 20:53:05




Report to Moderator
 Re: Sputtering B and a MS Carb in reply to Matt Campbell, 04-19-2001 05:53:03  
Matt,
You have gotten several good suggestions.
One question, is there black smoke from the exhaust when it sputters? That would indicate an over-rich condition of the fuel/air mixture.
If there is no black smoke, the mixture is probably too lean.
My suspicions are that the mixture will turn out to be too lean.
Do what was said about cleaning out the carb and sediment bowl. Install the inline filter (less than $2 and well worth it). Check down in the gas tank for loose rust/dirt/trash blocking the fuel outlet to the sediment bowl. This is a very common problem. You may have to drain and remove the tank to get it clean enough to stop the problem from reoccurring.
After you get the fuel tank and lines to the carb clean and giving good flow to the carb, set the float level a bit higher if the problem isn't cured. Keep raising the float in 1/16" increments until the sputtering stops, but stop when the float top is slightly below level with the top of the fuel bowl to keep the carb from flooding.
Also give the carb a good cleaning, paying special attention to every little passage. Use a wire from a wire brush to clean out holes that are stopped up.
That should fix the sputtering problem for sure.

Phil

[Log in to Reply]  [No Email]
Bruce Paul

04-19-2001 20:37:43




Report to Moderator
 Re: Sputtering B and a MS Carb in reply to Matt Campbell, 04-19-2001 05:53:03  
Matt, I've got a '48 B with a Zenith and a '50 B with an MS. The parts manual shows both carbs so my guess would be that AC bought both and installed whatever they had on hand.



[Log in to Reply]  [No Email]
Tom`

04-19-2001 18:31:31




Report to Moderator
 Re: Sputtering B and a MS Carb in reply to Matt Campbell, 04-19-2001 05:53:03  
The MS carb directions for my WD are 1/4" to 9/32" from the face of gasket to nearest edge of float for the float level. Idle mixture screw-1 turn off seat, high speed or power screw- 1turn off seat. Another manual says 1 3'8 turns open. It depends where it runs the best and will vary. And these are for a WD, might get you close though. I don't see a listing for a MS on a B. This could be the problem too if the carb is too big for the engine. Anyway the idle screw is the smaller one near the nut on the stud that holds the carb to the manifold. The high speed or main jet is the larger screw near the front of the carb. It may have a spring finger on it to keep it in position. Try draining the carb and cleaning the fuel strainer and possibly installing a disposeable inline filter. You could take the bowl off, it is easy, and see if there is dirt or rust in the bowl . Hope this helps, let us know how it goes.

[Log in to Reply]  [No Email]
Tyler(WA)

04-19-2001 10:24:18




Report to Moderator
 Re: Sputtering B and a MS Carb in reply to Matt Campbell, 04-19-2001 05:53:03  
My Massey Ferguson has a Marvel carb on it but all my AC's have Zenith.

It sounds like your float might be either sticking or needing adjustment. Perhaps you got some crud in the float bowl? I'd check it out before adjusting anything. Changing on a slope is significant and usually indicitive of float level problems.

The two screws are either Hi and Lo speed fuel adjustment or fuel and air but I'd lean toward Hi and Lo. Sorry I can't help more.

[Log in to Reply]  [No Email]
Hal

04-19-2001 19:16:36




Report to Moderator
 Re: Re: Sputtering B and a MS Carb in reply to Tyler(WA), 04-19-2001 10:24:18  
These Marvel Shiebler carbs are not complicated. Forn N series tractors have them and they are not hard to disassemble clean and reassemble see a Ford dealer for gaskets.



[Log in to Reply]  [No Email]
[Options]  [Printer Friendly]  [Posting Help]  [Return to Forum]   [Log in to Reply]

Hop to:


TRACTOR PARTS TRACTOR MANUALS
We sell tractor parts!  We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]

Home  |  Forums


Copyright © 1997-2023 Yesterday's Tractor Co.

All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy

TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.

Yesterday's Tractors - Antique Tractor Headquarters

Website Accessibility Policy