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Wrist Pin questions

 
  #1  
Old 10-15-2011, 11:19 PM
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Wrist Pin questions

So I am all set to drop my crank, rods, and pistons off Monday morning to be balanced. I have cyro-treated forged rods from WOP and new pistons, pins, and bushings from Ford. I pressed the new bushings into the rods myself Friday. When I went to install the pistons onto the rods today the wrist pins don't fit into the new bushings. I am wondering what I need to do now.
 
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Old 10-15-2011, 11:31 PM
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The I.D. of the wrist pin bushing should be 1.308-1.309". I would measure them and see if they are of the correct diameter. They may need to be honed or reamed. How did you install them?
 

Last edited by mueckster; 10-15-2011 at 11:34 PM. Reason: wrong dimension --corrected
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Old 10-15-2011, 11:36 PM
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I will have to measure that tomorrow. I just used my press and pressed them in. I have a couple extra bushings new from ford and i can't even put the wrist pins though those.
 
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Old 10-16-2011, 12:15 AM
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Each pin needs to be "fitted".

That means that the pin bushings are honed to a select diameter determined by the pin that is married to it.

Fitting is a machine shop function, and sometimes there is an interference fit, and sometimes the pins are "floaters".

I'm pretty-sure that a Powerstroke's float.

Pop
 
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Old 10-16-2011, 12:49 AM
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Originally Posted by SpringerPop View Post
Each pin needs to be "fitted".

That means that the pin bushings are honed to a select diameter determined by the pin that is married to it.

Fitting is a machine shop function, and sometimes there is an interference fit, and sometimes the pins are "floaters".

I'm pretty-sure that a Powerstroke's float.

Pop
Funny thing is that my service manual doesn't mention having to size them.
 
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Old 10-16-2011, 02:59 AM
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Subcribing. I would call where you bought them. Talk to ziggy or somebody who's done them.I guess I never pressed the bushing on the rods before always had the machine shop do that so can't help with the sizing. But at the end they should slid in. Chet
 
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Old 10-16-2011, 10:23 AM
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Yea my service manual says nothing about fitting or having to press either. So this was a bit of a surprise to me. I figure Iam going to talk to the machine shop about it tomorrow morningand see what they say.
 
 
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