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Minneapolis Moline Tractors Discussion Forum
Show Parts for Model:

minneapolis moline big mo 400M

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Author  [Modern View]

02-13-2018 21:22:36

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I have a big mo 400M. when I took the heads off and checked the

piston size it is 3.756 but the book size is 3.625 (3 5/8).

when i went on line for parts all I can find is the 3.625 size for head gaskets sets.

Any ideas

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02-15-2018 11:17:02

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 Re: minneapolis moline big mo 400M in reply to rcflyer74, 02-13-2018 21:22:36  
thank you for the info,
I can use all the help

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02-14-2018 17:26:28

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 Re: minneapolis moline big mo 400M in reply to rcflyer74, 02-13-2018 21:22:36  
A BIG MO 400M (military) should have 3.7518-3.7522 cylinder bores, the same as a U302.
A BIG MO 400 should have 3.6255-3.6265 cylinder bores the same as other OHV 206's.
Head gaskets for a U302 should work fine on the big mo 400M.
You should be aware that the bearings and I think the crankshaft used in the 400M are different than those used in the non-military engines.

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02-14-2018 14:40:50

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 Re: minneapolis moline big mo 400M in reply to rcflyer74, 02-13-2018 21:22:36  
thanks well give it a try

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02-14-2018 12:44:26

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 Re: minneapolis moline big mo 400M in reply to rcflyer74, 02-13-2018 21:22:36  
Looks like the engine was rebuilt at some point using overbore piston. Most of the time a "standard " gasket allows for overbore. Otherwise, use gasket for a 220 engine (U302) which is 3.750.

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