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bozrae 
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Joined: 02 Jul 2012
Location: Michigan
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 Topic: WD45 Gas main bearing block bore dia.
Posted: 07 Feb 2025 at 7:35am |
Does anyone know the actual specs from AC what the bore diameter of the mains should be in the block of a WD45 gas engine? I'm not talking about the bore diameter with the bearings installed. The AC service manual I have does not give that specs for the WD45. The service manual for a 170/175 does give the specs, but they are different from the WD45. Thanks
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D15D, D17G, 170G, 175D, and two 5050FWA
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WF owner
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Joined: 12 May 2013
Location: Bombay NY
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Posted: 08 Feb 2025 at 6:01am |
I'm not sure about the spec you are looking for, but the WD45 had a W-226 engine. The D-17, 170 and 175 had a G-226 engine. The G-226 had a different crankshaft with larger bearings and a whole different oiling system.
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bozrae
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Posted: 08 Feb 2025 at 7:10am |
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I'm looking for the specs on the wd45. I do have specs for the D17, 170. Thanks
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D15D, D17G, 170G, 175D, and two 5050FWA
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DrAllis
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Posted: 08 Feb 2025 at 7:21am |
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I've just now checked my official A-C service manual. They give no specs !! Any good machine shop (I know...few and far between these days) will have the main bearing bore specs. It would be measured with NEW shim stacks at each of the six locations. In the tractor pulling world, we usually remove the shims and have the block align-bored to correct size, eliminating the shims altogether.
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HudCo
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Posted: 08 Feb 2025 at 12:01pm |
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sounds like that is what he is after is getting it line bored
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DrAllis
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Posted: 08 Feb 2025 at 12:12pm |
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And like I said, a good machine shop will know what that size is.
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Les Kerf
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Posted: 08 Feb 2025 at 1:18pm |
 DrAllis wrote:
And like I said, a good machine shop will know what that size is. |
Yup. Especially if they are the ones who ground the crank.
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bozrae
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Posted: 14 Feb 2025 at 8:45am |
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Thanks for the responses.....at this point I'm just curious as to what it should have been when it left the factory and then determine what I want to do with it.
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D15D, D17G, 170G, 175D, and two 5050FWA
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DrAllis
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Posted: 14 Feb 2025 at 9:05am |
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If it had shim stacks (6) on the main caps and hasn't failed or spun a main bearing, you know what they did 50 and 60 and 70 years ago??? Put it back together with new bearings and shim stacks and plastigauge your clearances.
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