TRACTOR PARTS Allis Chalmers Case & David Brown Farmall & International Ferguson Ford & New Holland John Deere Massey Ferguson Massey Harris Minneapolis Moline Oliver & Cockshutt Kubota / Yanmar

TRACTOR MANUALS

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.

Allis Chalmers Discussion Forum

Misfiring problem on a B - cold tappet settings ?

Welcome Guest, Log in or Register

Author

Grennie (UK)

08-26-2005 07:52:38

Report to Moderator

After engine warms up certain cyclinders start misfiring. This normally occures after the engine has been running for 10 minutes. I have changed the head gasket as I suspected it was water getting in to a cylinder originally.

The book says the tappets should be set at .010" hot but it is not always easy to do that. Could it be that when certain push rods are getting hot they are preventing the valves from fully closing (hence its missing on that cylinder)? I have now set the tappets at .020" cold but should I increase this to eliminate the possibility of 'expanding' push rods ?

Final point .. when the engine has cooled down and is started again it fires on all 4 cylinders.

[Log in to Reply] [No Email]

Jerry Rivas

08-28-2005 09:24:37

Report to Moderator

Re: Misfiring problem on a B - cold tappet setting in reply to Grennie (UK), 08-26-2005 07:52:38

Yo Buddy. You might as well start by finding a coil tester. If it were mine, I'd change plugs, cap, rotor, wires, points and condensor. If that dont cure it. Sell it. But whatever you do, dont run the valves real loose. They will be noisy and you'll lose a good bit of yer 22 pony power.

[Log in to Reply] [No Email]

Jerry from East Iowa

08-26-2005 09:42:22

Report to Moderator

Re: Misfiring problem on a B - cold tappet setting in reply to Grennie (UK), 08-26-2005 07:52:38

Hi, Grennie
To answer your question about what the cold setting should be, take your hot setting and add .002 to it. (ie. .010 hot is .012 cold, .015 hot is .017, and so on)That will hit the mark almost every time.I do agree with the other guys when they say your problem is more than likely ignition.Questions please e-mail [email protected]
Thanks,
:) Jerry
Jerry's Tractor Repair Holy Cross, Iowa

[Log in to Reply] [No Email]

John T

08-26-2005 08:15:54

Report to Moderator

Re: Misfiring problem on a B - cold tappet setting in reply to Grennie (UK), 08-26-2005 07:52:38

Is it ALWAYS the same cylinders that drop out?? If so and its not the valve problem, you may wanna check the cap n rotor n plugs n plug wires to those cylinders !!!

If you remove the plug wire back maybe 1/8 to 1/4 away from the missing cylinders plug n she fires then, its a faulty fouling plug. A faulty condensor or a coil can act up once hot also, but that shouldnt always be on certain particular cylinders only!!

John T in Indiana, retired electrical engineer

[Log in to Reply] [No Email]

Jerry Coulter

08-26-2005 08:15:03

Report to Moderator

Re: Misfiring problem on a B - cold tappet setting in reply to Grennie (UK), 08-26-2005 07:52:38

Don't run your valves too loose. This sounds like an ignition problem. Are you using Champion spark plugs? They are yesterday's premium plug, but they don't perform well these days. You could be having a heat failure in the coil or condensor. Pull a plug wire off when the tractor is running and compare the spark strength while cold, then warm.

[Log in to Reply] [No Email]

Grennie (UK)

09-07-2005 03:23:23

Report to Moderator

Re: Misfiring problem on a B - cold tappet setting in reply to Jerry Coulter, 08-26-2005 08:15:03

Changing the condenser fixed the problem. Used it last weekend and it worked fine. I even drove it the 8 miles to the event and back again.

Many thanks for advice given.

[Log in to Reply] [No Email]

Grennie (UK)

08-26-2005 08:40:36

Report to Moderator

Re: Misfiring problem on a B - cold tappet setting in reply to Jerry Coulter, 08-26-2005 08:15:03

Thanks guys .. I'll wait till it stops raining then test the spark. What I have already done is to remove the leads off the plugs while it is running (using insulated gloves) to determine which cylinder is missing but I havn't checked the spark off the lead .. good thinking 99.

[Log in to Reply] [No Email]

[Options] [Printer Friendly] [Posting Help] [Return to Forum] [Log in to Reply]

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