D15 Plugs - PLEASE HELP
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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=47439
Printed Date: 29 Aug 2025 at 10:08am
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Topic: D15 Plugs - PLEASE HELP
Posted By: D16Allis
Subject: D15 Plugs - PLEASE HELP
Date Posted: 17 Mar 2012 at 11:27am
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I have a D15 engine in my D14 and need to put a new set of plugs in. The parts store NAPA told me that some D15s need a protruded plug to fire correctly. He gave me the short ones because if I was to use the longer ones it could hurt the pistons. The block has a number 0G6T on it. Not sure where to look on the head if there is a number that would be on there. If any one knows what ones to use or how to know PLEASE HELP!
THANKS,
RB
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Replies:
Posted By: Chalmersbob
Date Posted: 17 Mar 2012 at 9:29pm
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Look on the side of the engine behind the carb for the serial #. It will tell you which engine you have. The D14 and early D15 both had a 149 cu in engine and took the same plug AC 295's or Champion J-8. they have 3/8" reach. If you have a 160 cu in engine, I'm not sure which plug to use. Bob
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Posted By: Kip-Utah
Date Posted: 17 Mar 2012 at 9:35pm
That would be Autolite 295s. AC would be 45s or 47s. Kip
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HANSEN'S OLD ORANGE IRON. Showing, Pulling, & Going!!
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Posted By: DSeries4
Date Posted: 17 Mar 2012 at 11:21pm
Autolite 295s work for both.
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'49 G, '54 WD45, '55 CA, '56 WD45D, '57 WD45, '58 D14, '59 D14, '60 D14, '63 D15D, '66 D15II, '66 D21II, '67 D17IV, '67 D17IVD, '67 190XTD, '73 620, '76 185, '77 175, '84 8030, '85 6080
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Posted By: DrAllis
Date Posted: 18 Mar 2012 at 6:11am
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Your Parts Store is wrong.....no model D15 ever used anything any longer than a 3/8" length spark plug.
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Posted By: Stan IL&TN
Date Posted: 18 Mar 2012 at 6:41am
Can't you just remove one and take it to the parts store to match it up?
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1957 WD45 dad's first AC
1968 one-seventy
1956 F40 Ferguson
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