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Minneapolis Moline Tractors Discussion Forum
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MM Z Crankpin Diameter

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Yugrotcart

02-11-2005 16:33:03




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With spring in the air I have finally gotten to replacing my crank bearings. I have measured the crank in two different places on each journal. All I have is a digital pair of calipers so that is what I used. The numbers I got are a little confusing for me, so if someone could help me clarify what I have come up with.
My specs show an original crankpin diameter of 2.6245-2.6250 with a running clearance of .0015-.003.
Here is what I came up with, measured at 2 different spots on each journal( in parellel )
# 1 2.6240 and 2.6195
# 2 2.6210 and 2.6180
# 3 2.6235 and 2.6240
# 4 2.6210 and 2.6205
Any ideas????? ???
Thx
Paul

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Yugrotcart

02-12-2005 03:12:33




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 Re: MM Z Crankpin Diameter in reply to Yugrotcart, 02-11-2005 16:33:03  
Thanks guys, you confirmed my thoughts. I will have to sleep on this one..... ....



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Scott_M670

02-11-2005 21:31:14




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 Re: MM Z Crankpin Diameter in reply to Yugrotcart, 02-11-2005 16:33:03  
It sounds like you have some where on your crank. You should have it ground by a machine shop. They will be able to mic the crank with a Micrometer and tell you how much you need to take off. My guess you will need to grind it to at least .01 undersized. You should be able to get underside bearings if they are available. If they are not there are other options but they get pricy quick.

The specs you gave on the crank. The first set is the actual diameter with a .0005 tolerence. You measure this dimension with the a micrometer.

The second is the running clearence which the space between the bearing and crank. You can measure the bearing clearence with plastigage.

Good luck

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Kelvin

02-11-2005 17:49:26




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 Re: MM Z Crankpin Diameter in reply to Yugrotcart, 02-11-2005 16:33:03  
Don't have the specs before me, but know that nominal dimeter of crankpins is 2.625. Tolerance is probably .0005, but don't know if its plus or minus. Also, crankpins tend to wear eccentric. That is, the side the rod bearing bears on when pushing down wears more than the area measured 90 degrees perpendicular to that side.
Long story short, #3 is the only one that you've measured that comes close to being within running tolerances.

In my opinion, The rest of your measurements are probably too far below spec to put back-At least not without getting somebody to mike the shaft with a real micrometer and tell you what they think.

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