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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: 22329 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 28 Oct 2025 at 8:57pm
Not logically. All the other bearings look fine. An oil pump failure (there is none) would have ALL bearings damaged, not one.
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SteveM C/IL View Drop Down
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Joined: 12 Sep 2009
Location: Shelbyville IL
Points: 8755 		Post Options Post Options   Thanks (0) Thanks(0)   Quote SteveM C/IL Quote  Post ReplyReply Direct Link To This Post Posted: 28 Oct 2025 at 9:11pm
It doesn't float on top of the oil. It's submerged. Been too long....I think it has an air pocket to keep it raised but it can sink if oil is low or steep hill etc... Either way it's always in the oil so that's not what ruined your bearing.
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55allis View Drop Down
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Joined: 30 Jun 2020
Location: Griswold Iowa
Points: 1191 		Post Options Post Options   Thanks (0) Thanks(0)   Quote 55allis Quote  Post ReplyReply Direct Link To This Post Posted: 28 Oct 2025 at 10:35pm
That was what I was thinking but I wanted to make sure.
I will see if I can get it to drain and get it patched up. Probably with have to have it soldered (looks like a visit to the local blacksmith).
1955 AC WD45 diesel with D262 repower, 1949 AC WD, 1963 A-C D17 series 3
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Joined: 19 Aug 2012
Location: central IL
Points: 3605 		Post Options Post Options   Thanks (0) Thanks(0)   Quote AC7060IL Quote  Post ReplyReply Direct Link To This Post Posted: Yesterday at 9:27am
55Allis, how is this fence row D17 patient? Did you locate some good used sleeves/pistons/rings/etc? Or did you go with a new rebuild kit?
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55allis View Drop Down
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Joined: 30 Jun 2020
Location: Griswold Iowa
Points: 1191 		Post Options Post Options   Thanks (0) Thanks(0)   Quote 55allis Quote  Post ReplyReply Direct Link To This Post Posted: 11 hours 27 minutes ago at 10:36pm
I’m planning on a complete new rebuild, figured by the time I’m done anyway it won’t cost much more.
The crank is the problem right now, it’s possibly gone too far to have it ground but the guy doing it could possibly get it built up again.
Currently waiting for a phone call from him next week (possibly and hopefully) for a definite answer.

I did get the head fully rebuilt (new valves, guides, and freshened up seats).
Also got the rims for the WD primed and painted so I can put the 16.9s on the D17, at least then I can say it’s on the start to go together..
1955 AC WD45 diesel with D262 repower, 1949 AC WD, 1963 A-C D17 series 3
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DrAllis View Drop Down
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Points: 22329 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 10 hours 7 minutes ago at 11:56pm
There is zero reason for him to "build up" a crank journal when there are hundreds of used cranks laying around in salvage yards. Bearings of minus .040" should be available for that crank. 
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Points: 5094 		Post Options Post Options   Thanks (0) Thanks(0)   Quote WF owner Quote  Post ReplyReply Direct Link To This Post Posted: 3 hours 58 minutes ago at 6:05am
Originally posted by DrAllis DrAllis wrote:

There is zero reason for him to "build up" a crank journal when there are hundreds of used cranks laying around in salvage yards. Bearings of minus .040" should be available for that crank. 

Things like this happen when you have a mechanic that really isn't familiar with Allis Chalmers engines. Unnecessary expensive repairs get done without anyone realizing there is a lot less expensive fix.
A friend of mine has a construction business. His screening plant had an AC 125 (B, C, CA) engine on it. It started putting coolant in the oil. His mechanic, who is a very good heavy equipment mechanic, told him to get another head because the head was cracked. He gave me the old head. I took the core plugs out of it and they were rusted out (not unusual). There was nothing else wrong with the head.
Sometimes paying a mechanic that is familiar with the brand you are working on is worth the extra cost.
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