Farm Equipment - G spark plug

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G spark plug

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=207151
Printed Date: 19 Jun 2025 at 3:29am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: G spark plug

Posted By: w3grant
Subject: G spark plug
Date Posted: 18 Jun 2025 at 6:49pm

I’m working on an Allice Chalmer G and three of the spark plugs are threaded directly into the head and one a spark plugs has a threaded spacer on it I have seen some pictures with them on it and some with them not are they needed and if they’re not needed what plug do I run?
Thanks Warren

Replies:

Posted By: steve(ill)
Date Posted: 18 Jun 2025 at 7:54pm

normally the spacer is added for one of two reasons...

possibly .... Original threads in the head are bad so they loctite in a spacer permanent. then put the plug in it...

the MAIN REASON .....If the engine burns oil and fouls a spark plug, putting the spacer in , moves the plug out slightly and may keep it from fouling as often.. possibly never.

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

Posted By: JoeM(GA)
Date Posted: 18 Jun 2025 at 8:32pm

Autolite 295 for the plug, you can use a 303 if you feel the need for a hotter plug

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Allis Express North Georgia
41 WC,48 UC Cane,7-G's,
Ford 345C TLB