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

Shop Now

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

Ford 9N, 2N & 8N Discussion Forum
Order Ford 8N Parts Online

8N Marvel Schebler Carburetor Flooding

Welcome Guest, Log in or Register
Author 
A J Parsons

04-18-2007 10:13:11




Report to Moderator

I am having some very real problems with this old girl, just rebuild the carb becuase you could fire her up, run her for a while, shut it off and she floods, gas is just pouring out of her.

So I rebuilt it, and know what I am doing by the way, and still have the problem, but now it is worse, and it seems the gas is pouring out of the main jet from the float chamber.

Was wondering, could I have a crack somewhere or is this a common problem and if so, how to fix.

[Log in to Reply]   [No Email]
A J Parsons

04-18-2007 15:01:41




Report to Moderator
 Re: 8N Marvel Schebler Carburetor Flooding in reply to A J Parsons, 04-18-2007 10:13:11  
First I would like to thank Dan, Jerry and Gahor for thier timely and very insighful replies, as I decided to take the advise and go back to the shop for another look see and try.

So here is what we have so far, and just checking in to see if there might be anything else I am missing, as now after planing both surfaces of the carburetor, after the first stroke across the sanding disk, I could quickly see we had some warping of the surfaces.

Next, looks as if I do not know my own strength, as when I tightened the power jet down I tore the rubber gasket that sits at its base, now we have reassembled and hooked up my bench fuel pump, just to see if we had leakage, sure enough we did, but did I ever turn red in the face when it come to mind, "Stupid, this is a purely gravity flow situation, no pressure required!"...AH_HAH!

S out to the tractor, hooked it up to the fuel line and granted, we no longer have the enormous overflow of gasoline coming from the power jet, but we do have a very little trickle, now I checked for levelness and sure enough, when I hold the carb level the trickle reduces extremely, so I can see the advise about truning off the fuel tank valve when one allows the tractor to sit for a period, and why it would appear that the tractor is flodded once it has been used a while.

SO could the three of you chime in and tell me if I am on to something here or still just chasing my tail.

Again, thanks a whole bunch for the advice, hope I may eb able to return the favor some day.

[Log in to Reply]  [No Email]
Jerry/MT

04-18-2007 21:55:22




Report to Moderator
 Re: 8N Marvel Schebler Carburetor Flooding in reply to A J Parsons, 04-18-2007 15:01:41  
I think you proved that your float adjustment is probably off. You shouldn't have even a trickle coming out of the main jet.



[Log in to Reply]  [No Email]
dan hill

04-18-2007 14:30:05




Report to Moderator
 Re: 8N Marvel Schebler Carburetor Flooding in reply to A J Parsons, 04-18-2007 10:13:11  
Dirt, hair ,grass, and rust will make a needle valve leak.



[Log in to Reply]  [No Email]
Jerry/MT

04-18-2007 10:40:25




Report to Moderator
 Re: 8N Marvel Schebler Carburetor Flooding in reply to A J Parsons, 04-18-2007 10:13:11  
It's a pretty common problem on the M-S carbs. If you have fuel coming out of the main jet, I think that's above the spilt line between the castings so that something is really off. In the short term you can just shut off the tank valve, but with a fuel level that high your mixture will be way off. I presume you made sure that the floats aren't leaking and thus holding the float valve open. You have to really torque the float valve seat down. Was there any excess wear in the float pivot pin area that would allow sideways motion that could cause the float to hang up on the side of the fuel bowl? Is the float assembly straight so it doen't ride against the fuel bowl sides? (Sometimes a rap on the side of the fuel bowl with a block of wood can free the float up, but it's indicative of a float alignment problem or pin/bearing wear at the pivot point.)If none of these are the problem than your float setting is incorrect and you'll have to readjust it.

[Log in to Reply]  [No Email]
gahorN

04-18-2007 10:30:06




Report to Moderator
 Re: 8N Marvel Schebler Carburetor Flooding in reply to A J Parsons, 04-18-2007 10:13:11  
Got a bad (sunk/soaked) float? Needle? Seat? Hung-up hinge/pin? In any case, you must turn off the fuel valve on all these old girls when they're not running, or they'll drip after a while. But it shouldn't run fuel when you shut 'er down just to change implements. More than 10 mins tho'....turn off the fuel.



[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