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Minneapolis Moline Tractors Discussion Forum
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Re: Minneapolis moline gb crank in a u

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Author  [Modern View]

02-07-2013 16:52:56

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You only change the crank gear if you are putting it in the later
tractors like a 5 star or M5 or 670 then you use the gear off an early 605 or 425. You can only offset grind the stroke about .150 unless you go undersize on the U journal.

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Blackland Dan

02-08-2013 20:21:10

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 Re: Minneapolis moline gb crank in a u in reply to mmmmmmmmmmmmmmm, 02-07-2013 16:52:56  
Well then I guess my machine shop did me a favor. That explains why I had to change my crank gear because I put it in a 5 Star. Question mmmmm, would he be able to use the GB rods if he decreased the compression height on the pistons? Important point for me as it will change the way I do things from now on.

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02-10-2013 17:32:00

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 Re: Minneapolis moline gb crank in a u in reply to Blackland Dan, 02-08-2013 20:21:10  
No the G rods are much too long. A viable alternative is a Detroite inline 71 series rod it is a little narrow but the same rod brg size as a G 2.75 and is 10.125 inches long. There are some international v8 power units that use a 4.625 piston that will work with a 6 inch crank and this rod. They are even available in .060 oversize.

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