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Posted: 12/18/2016 6:11:03 PM EST
I have some heat treated piston rods that are a blueish purpleish tint on one end. The blue/purple will wipe off with brake cleaner and a rag. Is there any integrity issues with the metal or is it GTG?
Link Posted: 12/18/2016 6:33:05 PM EST
They are fine, you heat the small end of the rod to push a pressed wrist pin through. That way you don't crack a piston.
Link Posted: 12/18/2016 6:37:02 PM EST
That was my take on it. I have another set of the same rods from a different engine that are discolored in the same area but it's not blue/purple more of a burnt oil color. This particular setup the rods are not heated to install the pins, they float and are held in the piston with circlips.
Link Posted: 12/18/2016 6:38:45 PM EST
If it wipes off with solvent it isn't discolored metal. Try wiping the color off of a color case hardened receiver; it ain't happening.
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