Whats this bluish spot on rod beam? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 03-04-2006, 11:31 PM
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Whats this bluish spot on rod beam?

I took a set of rods out of my olds engine to get resized, the other two were from a different engine as the first set had 2 spun bearings.

Anyway, I inspected these rods before they left and after I got them and all looked good. But, now after I washed the pistons and rods for assembly I noticed the two rods that were from the different engine both had a bluish colored spot on both sides of the rod about two inches from the small end of the rod.

What would make these get colored like that and are they OK to use? The machinist checked out these rods and resized them and said they were fine.

Any advice?

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Old 03-04-2006, 11:43 PM
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The rod heater does this when press fit pins are installed. Perfectly normal. Could be from a previous install if not blued all the way to the pin.
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Old 03-05-2006, 03:12 AM
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agreed. Press-fit pins are somewhat of a misnomer. Its a tight fit, but its accomplished by heating the rod and cooling the pin. Once assembled and allowed to return to normal temps its a press-fit.

If you were to just press the pins in the rod under normal temperatures it would cause stress fracturing and distortion of the small end of the rod.
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Old 03-05-2006, 09:42 AM
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Ok, thanks
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