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Minneapolis Moline Tractors Discussion Forum
:

uts kec crankshaft specs

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iowa806

03-31-2020 06:40:54




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Working on a 1939 UTS with kec engine. The rod journals all measure 2.364 but the 3 mains are all different. 2.496, 2.556 2.621 any idea what standard size is? All i have is a I&T book and nothing in the book goes back that old. The crank casting # is KE-401 if that helps




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iowa806

04-01-2020 07:26:55




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 Re: uts kec crankshaft specs in reply to iowa806, 03-31-2020 06:40:54  
Thank you for the replies. I will let the machine shop know and see what i can come up with for bearings



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george md

03-31-2020 12:45:10




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 Re: uts kec crankshaft specs in reply to iowa806, 03-31-2020 06:40:54  

Iowa, I have an old FM shop & bearing manual that lists the KEC.

Rods 2.372-2.3725

Main # 1 2.497-2.4975 Main #2 2.550-2.5505 Main #3 2.625-2.6255

george



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molinegb

03-31-2020 08:02:21




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 Re: uts kec crankshaft specs in reply to iowa806, 03-31-2020 06:40:54  
KEC motor uses no precision bearings. No spec's that I am aware o. Less than 2.342 on con rods use oversize shell. I have NOS bearings. Two standard and 2 over. Crank could be changed to a KEF one and use precision as well as change rods.



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Jr1983

04-01-2020 16:13:04




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 Re: uts kec crankshaft specs in reply to molinegb, 03-31-2020 08:02:21  
How does one tell if the crank is good if there are no specs? I believe you but how does one rebuild one of these?



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molinegb

04-01-2020 16:35:21




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 Re: uts kec crankshaft specs in reply to Jr1983, 04-01-2020 16:13:04  
No specs for MM/Twin city that I can find anywhere. These were babbitt motors and no bearings were precision. Shims were added or removed according to what was required. All motors had a stack of shims. As babbitt wore shims were removed till no shims would help. Then new babbitt was poured and start over. Babbitt could be scraped with a knife to fit. In KT book it says run motor until it starts pounding. Through handholes use a bar while someone slowly cranks to find bad rod bearing. Then remove shims to tighten. It would be rare in a babbitt engine to hurt crankshaft. Babbitt is real soft. Different rods were used to hold babbitt shell in place. Crankcase also different to hold main shells in place. Plastigage can be used to set up bearings. It takes time to set up as each bearing is torqued and tested. If to loose/tight start over. Several different thicknesses of shims used.

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iowa806

04-02-2020 08:15:00




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 Re: uts kec crankshaft specs in reply to molinegb, 04-01-2020 16:35:21  
very interesting, I am new to the moline world and am learning as i go. You mentioned switching to a kef crank and rods so everything is precision. Do you think i would be better off going that route rather then getting new bearings and trying to shim them?



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molinegb

04-02-2020 09:53:25




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 Re: uts kec crankshaft specs in reply to iowa806, 04-02-2020 08:15:00  
You will need another crankcase also. Whole KEF bottom end needed. Costs alot to get machining done. Or other option find whole motor. To me with specs motor not all that worn. Are you going to work it? A 1939 UTS not that rare of tractor.



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iowa806

04-03-2020 07:35:51




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 Re: uts kec crankshaft specs in reply to molinegb, 04-02-2020 09:53:25  
No, we wont work it. It was my grandfathers tractor so will just fiddle around the yard with it.



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Jr1983

04-01-2020 19:49:44




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 Re: uts kec crankshaft specs in reply to molinegb, 04-01-2020 16:35:21  
Thanks. That's good info. I really appreciate it.



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Dennis P

04-02-2020 05:16:58




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 Re: uts kec crankshaft specs in reply to Jr1983, 04-01-2020 19:49:44  
For whatever itís worth, I had the rod journals all machined to the same size. I then poured new babbit and bored them to match the rods. If they are egg shaped you need to do more than reshim.



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molinegb

04-02-2020 08:10:48




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 Re: uts kec crankshaft specs in reply to Dennis P, 04-02-2020 05:16:58  
If crank throws were egg shaped I would just go get a better crankshaft and bearings rather than getting machined.



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