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Minneapolis Moline Tractors Discussion Forum
Show Parts for Model:

minneapolis moline big mo 400M

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rcflyer74

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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rcflyer74

03-28-2018 11:10:09




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 Re: minneapolis moline big mo 400M in reply to rcflyer74, 02-13-2018 21:22:36  
Thanks I well check that.



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shinnery

03-27-2018 19:11:15




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 Re: minneapolis moline big mo 400M in reply to rcflyer74, 02-13-2018 21:22:36  
Check the flow rate from the tank, you may have an obstruction. Do you have an add on inline filter? Some of them will not flow enough for a gravity system.



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carvel minne farmer

03-27-2018 19:10:49




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 Re: minneapolis moline big mo 400M in reply to rcflyer74, 02-13-2018 21:22:36  
rust, dirt crude in the fuel tank and lines?? doing a winter refit on my mm m5 and tank is coming out to go to rad shop for cleaning, had same issues when we got it running this summer (after sitting in the trees for 20 years) flushed it out the best I could to keep going but I know it needs a proper clean up.



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rcflyer74

03-27-2018 17:06:02




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 Re: minneapolis moline big mo 400M in reply to rcflyer74, 02-13-2018 21:22:36  
Can anyone tell me why the engine runs and dies, just can't seem to keep the thing running, I cleaned the carb but still the same thing. at a loss.



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rcflyer74

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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JK2

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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rcflyer74

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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mmfan55

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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