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Old 07-06-2013, 03:16 PM
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Bronze colored rod ?

I had my engine in the machine shop and had new pistons put on the rods. the rods were all the same color when they went in but when they came back # 7 came back with the wrist pin end a bronze color. Im concerned about the possibility of the rod having ben weakened by the obvious over heating of the rod. Can someone tell me if I should be concerned about this issue ?
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Old 07-06-2013, 03:25 PM
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Quote:
Originally Posted by rndyhd View Post
I had my engine in the machine shop and had new pistons put on the rods. the rods were all the same color when they went in but when they came back # 7 came back with the wrist pin end a bronze color. Im concerned about the possibility of the rod having ben weakened by the obvious over heating of the rod. Can someone tell me if I should be concerned about this issue ?
The machinist uses a special rod heater to heat the pin end of the rod to ease intalling the pin. Nothing to be concerned about.
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Old 07-06-2013, 03:31 PM
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The bronze color is from a factory procedure to tighten up the pin fit. The rod is plated to make the pin hole smaller, resized and then used.
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Old 07-06-2013, 04:07 PM
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The straw color indicates the rods were heated to about 600* F in a rod heater which is the approved controlled method and correct temperture. I would not worry about those rods. A acetylene torch or some other uncontrollable method of heating a rod should not be used to install pins. That is the main reason GM recommends press fitting the pins in their PM rods.
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