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55allis 
Orange Level
Joined: 30 Jun 2020
Location: Griswold Iowa
Points: 1089
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 Posted: 09 Oct 2025 at 11:14pm |
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I got on A and I parts and search that number
(SK156) and they have an overhaul kit for $918 or $131 for the sleeve, piston, and rings per cylinder.
And it says it’s a high compression kit and 4.125” overbore.
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1955 AC WD45 diesel with D262 repower, 1949 AC WD45
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55allis
Orange Level
Joined: 30 Jun 2020
Location: Griswold Iowa
Points: 1089
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Posted: 10 Oct 2025 at 2:24pm |
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Would anyone know of a ring kit for the sp-48 m and w piston?
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1955 AC WD45 diesel with D262 repower, 1949 AC WD45
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WF owner
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Joined: 12 May 2013
Location: Bombay NY
Points: 5046
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Posted: 10 Oct 2025 at 3:40pm |
They are available from some of the aftermarket companies.
If I remember correctly, I got a set from Perfect Circle several years ago. You need to measure the size of the rings. All M&W pistons (for the 201/226) are 4.125" (oversize).
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evan austin
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Joined: 01 Jul 2021
Location: Gaston Indiana
Points: 25
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Posted: 11 Oct 2025 at 7:48pm |
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Steiner lists a piston and sleeve kit P/N ACS3056, 4 1/8" bore, they claim 7.25:1 compression, for $439.99 plus shipping. This is the first time that I have seen the compression ratio listed on one of their kits, maybe it was always there and I didn't notice it before...
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55allis
Orange Level
Joined: 30 Jun 2020
Location: Griswold Iowa
Points: 1089
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Posted: 12 Oct 2025 at 4:11pm |
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Think I’m going good used on the two sleeves due to it being decently low houred and the two good sleeves are very good.
Will put rings and O rings on all the sleeves to prevent problems.
Think I will rebuild the head because of a lot of pits in the valves.
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1955 AC WD45 diesel with D262 repower, 1949 AC WD45
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55allis
Orange Level
Joined: 30 Jun 2020
Location: Griswold Iowa
Points: 1089
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Posted: 14 Oct 2025 at 12:02pm |
Got the oil pan off today and figured out why it was parked, it had spun a rod bearing…  
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1955 AC WD45 diesel with D262 repower, 1949 AC WD45
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scott
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Joined: 12 Sep 2009
Location: michigan
Points: 2749
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Posted: 15 Oct 2025 at 9:30am |
Is the spun rod bearing on one of the good cylinders?
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55allis
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Joined: 30 Jun 2020
Location: Griswold Iowa
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Posted: 15 Oct 2025 at 9:40am |
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Yes, it was number 4.
1 and 4 has good sleeves but 2 and 3 sleeves are junk.
Got all the pistons and sleeves out and the pistons look all good. Even the rings don’t look too bad.
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1955 AC WD45 diesel with D262 repower, 1949 AC WD45
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55allis
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Joined: 30 Jun 2020
Location: Griswold Iowa
Points: 1089
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Posted: 15 hours 54 minutes ago at 6:11pm |
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Found Abilene machine has the overhaul kit for $500 and that comes with everything including shipping.
Only thing is that it’s the original 7.25:1 compression ratio. But it is 4.125 overbore.
Also found a guy who might be able to fix my crank shaft quite a bit cheaper.
Question: how would I test the oil pump before I put it together?
I want to be sure that it has good oil pressure before I put it together to be safe.
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1955 AC WD45 diesel with D262 repower, 1949 AC WD45
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WF owner
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Joined: 12 May 2013
Location: Bombay NY
Points: 5046
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Posted: 13 hours 32 minutes ago at 8:33pm |
The doctor can correct me, but I believe only the (gas) 175 had the 8.25/1 compression ratio pistons (maybe some propane engines, too) and they are very hard (almost impossible) to find.
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55allis
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Joined: 30 Jun 2020
Location: Griswold Iowa
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Posted: 12 hours 31 minutes ago at 9:34pm |
Here’s a link to an A and I high compression kit.. https://www.allpartsstore.com/ItemDetl.htm?ResultsList=251016376624998&CategorySeq=&SelcBrand=&SelcMachn=&SelcModel=&SelcSectn=&SelcSubsc=&SearchDesc=1&TextSearch=ALLIS%20CHALMERS%20D17%20OVERHAUL%20KIT&ItemNumber=IK405It’s $918 bucks but according to Doc it’s 10:1 compression. I wasn’t wanting to spend that much on it though. Would be curious if anyone on here has done that kit and dynoed it?
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1955 AC WD45 diesel with D262 repower, 1949 AC WD45
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DrAllis
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Joined: 12 Sep 2009
Points: 22071
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Posted: 11 hours 7 minutes ago at 10:58pm |
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175 gas engine is 4 inch bore @ 8.25 to 1 compression. D-17 LPgas is also 8.25 to 1 with 4 inch bore.
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HudCo
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Joined: 29 Jan 2013
Location: Plymouth Utah
Points: 3940
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Posted: 1 hour 24 minutes ago at 8:41am |
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no cumbustion chamber with flat tops
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55allis
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Joined: 30 Jun 2020
Location: Griswold Iowa
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Posted: 1 hour 2 minutes ago at 9:03am |
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1955 AC WD45 diesel with D262 repower, 1949 AC WD45
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