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

Discussion Forum

Soot in plugs

Welcome Guest, Log in or Register
Jack in TN

12-21-2001 19:06:02

Report to Moderator

I have a 1949 8N that runs and starts good most of the time. However, I find black soot on the plugs after running for a period of time. I have updated everything on the tractor except I have not done anything with the carb. but check to see if it is clean and gas flows good. Does anyone have a suggestion as to stopping this unburned fuel problem?

[Log in to Reply]   [No Email]

12-22-2001 06:36:34

Report to Moderator
 Re: Soot in plugs in reply to Jack in TN, 12-21-2001 19:06:02  
Jack I agree with Ed below, Black "soot" means rich fuel mixture.

However, if you have black "wet looking" deposits it may mean poor rings (oil getting by into the combustion chamber).

If just soot - don't change to hotter plug (not necessary), just adjust the fuel mixture to the correct leaner mixture and be sure to check and make sure the air filter is clean and proper weight oil is being used in the "bath".

If wet looking black deposit - Yes try a hotter plug to help burn off the oil and most likely leave the mixture setting as is.

Hope this helps, Jim

[Log in to Reply]  [No Email]

12-22-2001 06:29:10

Report to Moderator
 Re: Soot in plugs in reply to Jack in TN, 12-21-2001 19:06:02  
Are you running with or without a thermostat. In cool weather you will not reach operating temp without one. Could also be carb float or mix and/or timing.

[Log in to Reply]  [No Email]

12-22-2001 05:02:20

Report to Moderator
 Re: Soot in plugs in reply to Jack in TN, 12-21-2001 19:06:02  

Too rich could be not enough air due to dirty air cleaner.

Try Autolite 437s, they are a bit hotter.

If you have time go ahead and rebuild the carb. Parts are cheap and theres a good tutorial in the archives.

[Log in to Reply]  [No Email]

12-22-2001 03:09:53

Report to Moderator
 Re: Soot in plugs in reply to Jack in TN, 12-21-2001 19:06:02  
possible solutions -

1) adjust fuel mix (black plugs too rich, white too lean)

2) spark plug extenders (don't know how they work but understand that they prevent fouling)

[Log in to Reply]  [No Email]
Different plugs

12-21-2001 19:46:54

Report to Moderator
 Re: Soot in plugs in reply to Jack in TN, 12-21-2001 19:06:02  

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

Hop to:

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