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Old 10-24-2011, 02:32 PM
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Wrist Pin Installation

I was wondering what is the most current way to press in wrist pins? I would say put the pin in the freezer and then press it in, but the machine shop who put my motor together heated the connecting rod and pressed the pin in. I would think this would make the connecting rod brittle and possible leave the whole larger than what it was. Does anyone else heat the connecting rods?

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Old 10-24-2011, 02:35 PM
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Originally Posted by novaboy17
I was wondering what is the most current way to press in wrist pins? I would say put the pin in the freezer and then press it in, but the machine shop who put my motor together heated the connecting rod and pressed the pin in. I would think this would make the connecting rod brittle and possible leave the whole larger than what it was. Does anyone else heat the connecting rods?
Not anyone heat them more like almost every one heats the small end to press pins. No harm is done if done right.
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Old 10-24-2011, 03:09 PM
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But dont you run the risk of the hole not shrinking back done to the proper size?
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Old 10-24-2011, 03:25 PM
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Cant see them heating them redhot or anything......maybe 200-300 F.......that isnt going to affect it.
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Old 10-24-2011, 03:32 PM
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Mr. Poncho is right- they dont heat enuff to ruin temper of the steel. A video showing it http://www.youtube.com/watch?v=H2YrL3k__dA
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Old 10-24-2011, 07:28 PM
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Quote:
Originally Posted by novaboy17
I was wondering what is the most current way to press in wrist pins? I would say put the pin in the freezer and then press it in, but the machine shop who put my motor together heated the connecting rod and pressed the pin in. I would think this would make the connecting rod brittle and possible leave the whole larger than what it was. Does anyone else heat the connecting rods?
Normal process is to heat the small end a bit so the pin drops in, it doesn't take much. That way the refirgerator has space for cooling the beer. Actually, its faster to heat the rod than to think about keeping pins on ice.

Bogie
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Old 10-24-2011, 07:30 PM
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Thanks for the help everyone
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