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 5:51pm
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

Posted By: Steve in NJ
Date Posted: 19 Jun 2025 at 5:59am

Turn that around Joe. The 295 is hotter than the 303. Go by the last digit for the heat range in Autolite. Obviously, 5 is higher than 3 so 5 being the hotter heat range. Your right in your assumption, hotter in a worn engine or oil control issue. As Stevo said, one of the two is probably the issue. Bad threads or bad rings in that one cylinder...

Steve@B&B

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39'RC, 43'WC, 48'B, 49'G, 50'WF, 65 Big 10, 67'B-110, 75'716H, 2-620's, & a Motorhead wife

Posted By: JoeM(GA)
Date Posted: 19 Jun 2025 at 7:02am

LOL!, correct as always Steve, what do you expect, I’m getting older and forgetful

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