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.

Harry Ferguson Tractors Discussion Forum
:

Plug fouling

Welcome Guest, Log in or Register
Author 
Randyr

10-04-2006 03:50:02




Report to Moderator

On my 35 gas with Z134 engine, the #4 plug fouls up and misfires. Cleaning it doesn't help, it must be getting fouled further up the ceramic center and shorting out there, I guess. It's an oily fouling but the cylinder had 145 #s compression. Right up to snuff. It makes me think it's the valve seals/guides leaking oil into the cylinder when cool, then taking up the slack when hot, dirtying the plug in the process. If the plug can make it through the warm up still firing, it will be ok when warmed up.
My question: How can I keep the plug firing on a cold start through the warm up when the cylinder is oily?
And how can I properly clean the plug? I even tried burning out the deposits with a propane torch with no luck.
It's 12 volt with Pertronix ignition, and runs good when #4 is working. Would a hotter plug help? Have had Champ D21, and NGK A6. Maybe a wider gap, hotter coil?
What do you recommend?

[Log in to Reply]   [No Email]
woodsey11

10-08-2006 03:31:24




Report to Moderator
 Re: Plug fouling in reply to Randyr, 10-04-2006 03:50:02  
I have a 46 0r 47 Harry, Same problem, I put 2 wedges between distributor and engine block and it hits on all four. I think i need a rebuilt distrib, have not figured how to pull old and put rebuild back with out haveing to time it?



[Log in to Reply]  [No Email]
Duner Wi

10-05-2006 18:56:23




Report to Moderator
 Re: Plug fouling in reply to Randyr, 10-04-2006 03:50:02  
My question: How can I keep the plug firing on a cold start through the warm up when the cylinder is oily?
This usually works for me. Pull the plug wire off the plug so spark has to jump 1/4 inch to spark plug. You can use a popsicle stick and rubber bands to hold the wire. Fergusons usually don't over oil the top end or at least mine don't.



[Log in to Reply]  [No Email]
Dean

10-05-2006 16:46:07




Report to Moderator
 Re: Plug fouling in reply to Randyr, 10-04-2006 03:50:02  
Randy:

As you say, it sounds like oil is getting past the valve seal on #4.

If you can find them, "NO Foul Adapters" were once made for this type of problem. NAPA and J.C. Whitney both still had them about 10 years ago but I have not seen any lately.

I have used these in the past in engines that oil foul the plugs and they do indeed work. If you can find a set (or even one) you will probably be able to get by for years.

Dean

[Log in to Reply]  [No Email]
Randyr

10-04-2006 13:05:44




Report to Moderator
 Re: Plug fouling in reply to Randyr, 10-04-2006 03:50:02  
Yes it makes blue smoke on initial startup and then cleans up as it heats up.
I'm sure it needs head work, but it will have to wait. Until then I put in a new plug when misfire shows up and it runs fine. The plug stays clean once hot, fouls when cold and smokey.
Is an Autolite 386 better and less prone to fouling than a Champ D21?
Thanks.



[Log in to Reply]  [No Email]
gerard

10-04-2006 12:09:12




Report to Moderator
 Re: Plug fouling in reply to Randyr, 10-04-2006 03:50:02  
I would guess the fouling only appears oily because of the misfire. Was the engine smoking badly / using oil? If not, it"s not an oil issue, but an ignition one. Once a plug has been fouled, only place for it is the bin. Even a commercial grit blaster won"t rescue it.



[Log in to Reply]  [No Email]
Gerald J.

10-04-2006 11:50:18




Report to Moderator
 Re: Plug fouling in reply to Randyr, 10-04-2006 03:50:02  
Try a non resistor AC or Motorcraft plug. Hotter heat range won't hurt. Modern Champion plugs seem to foul easily and not to be cleanable.

Be sure the wires are copper, not carbon.

Gerald J.



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

10-04-2006 11:16:10




Report to Moderator
 Re: Plug fouling in reply to Randyr, 10-04-2006 03:50:02  
You seem to have lost oil control on #4 or, as you suspect, the valve seals are leaking.(You could also have a bad plug wire or a corroded terminal in the cap that causes a misfire.)The cure to your problem is to fix the root cause, i.e., loss of oil control. In the mean time, a hotter plug might help. There are spark plug hole inserts that move the plug out of the combustion chamber slightly to help with this problem. The fact that you have a Pertronix ignition says your spark should be hot enough and adding their "super coil" might help by allowing you to open the gap but you really need to deal with the root cause because the rest of the stuff is just a band aid.

[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