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Minneapolis Moline Tractors Discussion Forum
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More UMM engine questions

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Joel H.

10-02-2005 16:26:15




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Thanks for your replies to my question last week. Your replies have got me thinking, I have an M5 propane parts tractor in the grove. The motor is stuck and the heads are shot. Hopefully the blocks can be salvaged. If I can have the blocks bored and put the 4210 heads on will this combination run on straight pump gas or will I need higher octane? Will these parts be a bolt-on modification with no changes needed? I'm assuming use the U rods on the M5 pistons? And use the shorter head bolts out of the M5 to go with the 4210 heads? Would the M5 governor be a better governor to use? For stock antique pulling would there be any advantage to a puller grind on the cam shaft? Or would the M5 cam shaft be any advantage over the U ? Is there anything else I need to know when switching the blocks and heads I just don't want any surprises when I get into the project. Thanks for you help.

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Mopower

10-03-2005 05:32:47




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 Re: More UMM engine questions in reply to Joel H., 10-02-2005 16:26:15  
Most likely if you bore those blocks, you should run a little bit higher octane with 4210 heads. Our M5 had 4210 heads and klunked a bit when you turned the engine off (@ 87 octane). I'm helping Dad is putting together a U right now with M5 blocks and 4.75 aluminum M&W pistons. Use the U rods, however you need a slightly thicker gasket between the block and the crankcase. Dad built one of these years ago in a UTS and it was a real horse. We used spacers on out head bolts, but if you have the M5 studs, that would be easier. I don't know about the M5 cam, but I do know a great place to get a pulling cam for a good lugging stock antique engine. The M5 governor would be an improvement, but may require the adapter plate off a GVI to bolt in the UTU correctly. You are on the right track. I would not expect too many surprises. I'm not a high performance expert, but these M-M engine go together like LEGOS and you can usually know what to expect based on what parts you use. Feel free to e-mail me and I can tell you where I get parts and things. You could expect 75 h.p. without much trouble.

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