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Later d17 saved from fence row
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DrAllis View Drop Down
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Joined: 12 Sep 2009
Points: 22653 		Post Options Post Options   Thanks (1) Thanks(1)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 05 Feb 2026 at 9:57am
M & W were 7.5 to 1 compression with a 4 1/8" bore. Don't get confused here. It was two things: bore and compression. Raising a 4 inch bore from 7.25 to 7.5 to 1 compression would indeed be a minimal increase in HP.  WD45's can use D-17 pistons and sleeves and just like M & W's give the crankshaft a real workout if it is a plowing/discing tractor. Just the compression increase on a WD45 to 7.25 to 1 would yield 5 to 7 HP I think at 1400 RPM. I'd have to check my engine specs book at home, I'm going from memory.
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55allis View Drop Down
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Joined: 30 Jun 2020
Location: Griswold Iowa
Points: 1291 		Post Options Post Options   Thanks (0) Thanks(0)   Quote 55allis Quote  Post ReplyReply Direct Link To This Post Posted: 13 hours 21 minutes ago at 11:57pm
Got a Reliance kit a couple days ago and now ready to get the block from machine shop (he’s still trying to get me to do the secondary sleeves).
He got new cam bearings and got the block maniflex and it checked out okay.
What should the oil pressure be being rebuilt?
Looking at new gauges and there are a lot of options!!

Notice the new pistons have a note to run on a dyno within minutes of first starting it, does that have to be done or is there another trick that’s better?
1955 AC WD45 diesel with D262 repower, 1949 AC WD, 1963 A-C D17 series 3, several Allis garden tractors
     
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Les Kerf View Drop Down
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Joined: 08 May 2020
Location: Idaho
Points: 1592 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Les Kerf Quote  Post ReplyReply Direct Link To This Post Posted: 2 hours 10 minutes ago at 11:08am
Originally posted by DrAllis DrAllis wrote:

Installed a lot of sleeves in some pretty questionable G-226 blocks using RTV silicone and have never had one come back even decades after the OH.

Hmmm... is there any reason to not do this for extra insurance against leakage in a routine rebuild?
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DrAllis View Drop Down
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Points: 22653 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 2 hours 2 minutes ago at 11:16am
I've only ever used the RTV as a repair, and I have had good success with. If I remember correctly, 60 years ago, I think my local A-C dealership slathered on "white lead" paste on the sleeve Orings ???    I had never been taught that trick. I don't even know what white lead is. I've always used mazola corn oil/vegetable oil. At Caterpillar we use Crisco shortening. Lower sleeve bore damage on those 4-bangers is simply from people using straight water and/or never ever changing flushing the cooling system to purge out any sediment. it's the crap laying in the bottom of the coolant cavity in the block that erodes the cast iron away.
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