Farm Equipment - IB Random miss

Print Page | Close Window

IB Random miss

Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=140080
Printed Date: 15 Oct 2025 at 1:30pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: IB Random miss

Posted By: Ted in NE-OH
Subject: IB Random miss
Date Posted: 03 Jul 2017 at 7:59pm

I have an IB with a random miss. Removing one spark plug wire at a time , each wire slows engine down, valves do not appear to be sticking. Tractor has mag. Where and how do I find tha cause. Engine was recently rebuilt.

-------------
CA, WD, C, 3 Bs, 2 Gs, WC, I-400, 914

Replies:

Posted By: steve(ill)
Date Posted: 03 Jul 2017 at 10:55pm

what kind of spark plugs ? May need a new set.

-------------
Like them all, but love the "B"s.

Posted By: Gerald J.
Date Posted: 04 Jul 2017 at 8:18am

Recheck the valve clearance settings.

I have a shop manual on line at: http://www.geraldj.networkiowa.com/Trees/Allis-Chalmers-G-B-C-CA-Service.pdf" rel="nofollow - http://www.geraldj.networkiowa.com/Trees/Allis-Chalmers-G-B-C-CA-Service.pdf

Gerald J.

Posted By: Hubert (Ga)engine7
Date Posted: 04 Jul 2017 at 8:35am

You may need new plugs and solid core wires.

-------------
Just an old country boy saved by the grace of God.

Posted By: steve(ill)
Date Posted: 04 Jul 2017 at 9:57am

and make sure the MAG cap does not have any cracks or carbon tracks that could cause a short between leads.

-------------
Like them all, but love the "B"s.

Posted By: dave63
Date Posted: 04 Jul 2017 at 10:32am

I never had any luck with Champion plugs, even new ones

-------------
The universal answer to all questions is yes, how much do you want to spend?