Possible H3 repower?
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Construction and other equipment
Forum Description: everything else with orange (or yellow) paint
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=31119
Printed Date: 26 Jun 2025 at 4:34pm
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Topic: Possible H3 repower?
Posted By: chevytaHOE5674
Subject: Possible H3 repower?
Date Posted: 21 May 2011 at 6:59pm
My H3 149ci gasser has a broken cam that went into the crank. So before i start sinking a whole bunch of money into this thing would there be any possible repower options that would be beneficial (a little boost in power) and cost effective (not be too much more than a cam, crank, rebuild kit, and machine work)? I know a D15 tractor motor will fit but is lacking the fuel pump casting (but it would be easy enough to run a small electric fuel pump if needed).
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Replies:
Posted By: Calvin Schmidt
Date Posted: 21 May 2011 at 8:03pm
You could try to find a 160 cu.in engine the same as a D-15 II. It should give you a 8-10 hp increase and will be a bolt in.. Unless you are running on big slopes, I wouldn't be too concerned about the fuel pump. My H-3 has a 149 engine and could use more power.
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Nothing is impossible if it is properly financed
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Posted By: Coke-in-MN
Date Posted: 21 May 2011 at 10:13pm
One thing you might want to watch is the oil pan and oil pump pick up. Many dozers use different setup than other engines to be sure of oil at pump when working on grades or angles. (unsure of what the H3 used for that)
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Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something.
"Challenges are what make life interesting; overcoming them is what makes life meaningful."
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Posted By: chevytaHOE5674
Date Posted: 22 May 2011 at 9:25am
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Looks like a 160ci swap is the easiest. Any other motors out there that would bolt up to the bellhousing? I wouldn't be opposed to a little Fab work. haha
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Posted By: Kipn
Date Posted: 22 May 2011 at 10:33am
I think it was after serial #9001 that AC changed to the 160cid. I guess they knew it needed more. Just remember that the final drive on it was designed for a 40-50hp dozer. The fuel pump is a minor thing.
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1961 H3
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