ac 720
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=38842
Printed Date: 16 Sep 2025 at 12:29pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: ac 720
Posted By: DANinNY
Subject: ac 720
Date Posted: 13 Oct 2011 at 12:30am
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has anyone ever converted a 720 to a diesel if so any info ?
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Replies:
Posted By: Kcgrain
Date Posted: 13 Oct 2011 at 9:45am
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There was a discussion here alittle while ago, thet convinced me to try, I did find 27hp twin cylinder diesel engine with the dimentions of a Honda V Twin, I was leaning that direction when I came across a new 24hp Kubota 3 cylinder engine its water cooled so going to have to do some work with that, but I am pretty excited about fitting it, as is the kid who is going to drive it cutting grass.
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Posted By: DANinNY
Date Posted: 13 Oct 2011 at 8:06pm
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who made the 27 hp twin cylinder diesel you were going to put in it
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Posted By: Joe(TX)
Date Posted: 13 Oct 2011 at 8:20pm
I saw one that was done up like a 190XT at the gathering of the orange in Oklahoma a few years back. It had a diesel. It may have been a Yanmar out of a John Deere 330 or 430 lawn tractor. I have a JD 330 and it looks like it would be a good choice. It is a 3 cylinder.
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1970 190XT, 1973 200, 1962 D-19 Diesel, 1979 7010, 1957 WD45, 1950 WD, 1961 D17, Speed Patrol, D14, All crop 66 big bin, 180 diesel, 1970 170 diesel, FP80 forklift. Gleaner A
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Posted By: D-17_Dave
Date Posted: 13 Oct 2011 at 9:44pm
I started one of these projects several years ago. I have slowly gotten most of the details worked out and have most of the conversion stuff like shafts and adapters made. Just haven't had time to get back on it yet.
I can tell you I started with a 1100cc Kubota diesel 3cyl. 28HP non turbo-ed. It is a hood full and then some. You would be much better off with the 900cc 3 cyl. as you wouldn't have near as much mass to shoe horn into the frame. I have numerous mods to the frame to get it to work but I didn't stretch the frame or change the overall dimensions of the tractor so all attachments could be used as I planned on it being a working tractor. Diesel, power steering, water cooled, etc. Yanmar would be a good choice of engine as well but size will play a huge factor in number of mods needed for it to all work.
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Posted By: Kcgrain
Date Posted: 14 Oct 2011 at 9:50am
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The one I bought is the 900cc version so I am glad to hear I got lucky on that
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Posted By: DANinNY
Date Posted: 14 Oct 2011 at 1:05pm
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mailto:danwright7@netzero.net - danwright7@netzero.net
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Posted By: D-17_Dave
Date Posted: 14 Oct 2011 at 4:46pm
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If anyone wishes to talk to me about what I have done or ran into doing this I'll be glad to offer my assistance. Lots of us can do wonderful things in their shops, but I see no reason to reinvent the wheel when it comes to mistakes.lol
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Posted By: DANinNY
Date Posted: 14 Oct 2011 at 7:00pm
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D-17_Dave do you have any pictures of the work you have done so far
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Posted By: TREVMAN
Date Posted: 14 Oct 2011 at 7:57pm
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I have wondered about an aircooled twin diesel as a refit. I have had guys tell me that the aircooled diesels are excellent, others not so much. Would really simplify a repower though. Turn the same rpm and I think the clutch would bolt up without too much trouble. About the same size physically as the cckb, just a thought, Trev.
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Posted By: DANinNY
Date Posted: 14 Oct 2011 at 7:59pm
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also i have the ag tires on my 720 and wanted to switch to the high flotation tires any one know where i can get the rims
, i would like to get rid of the front and back ag tires if anyone is interested
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Posted By: den/southern illinoi
Date Posted: 14 Oct 2011 at 8:45pm
Dan, you have a PM from me...Den
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Own 4 wheel 20, 2-5015, 5020 and associated equipment and 2 electric forklifts.
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Posted By: Kcgrain
Date Posted: 15 Oct 2011 at 8:15am
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well if there is enough interest in Vtwin diesel I would import a container, which is 25 engines, The one I found was 1700 bucks but buying direct from the factory was more like 900,plus shipping, which so far has been unpriced, becasue I dont want 25 engines.
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Posted By: TREVMAN
Date Posted: 15 Oct 2011 at 10:12am
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The site I saw said $395 for a pallet of 4 engines for shipping. I might be interested in 1. Gets a guy an engine for about $1000 plus duty etc., just a thought, Trev.
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Posted By: Kcgrain
Date Posted: 15 Oct 2011 at 11:19am
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can you give me that site I was trying to find a lo number rather than the 25 and his price is better
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Posted By: TREVMAN
Date Posted: 15 Oct 2011 at 12:01pm
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Ya Ill pm you with the info, Trev.
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Posted By: DANinNY
Date Posted: 15 Oct 2011 at 3:36pm
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for that price i would buy one from you let me know if you decide to get them
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