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Archived [ARCHIVED THREAD] - discolored heat treated metal question
Posted: 12/18/2016 7:11:03 PM EDT
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 7:33:05 PM EDT
[#1]
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 7:37:02 PM EDT
[#2]
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 7:38:45 PM EDT
[#3]
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.

Archived [ARCHIVED THREAD] - discolored heat treated metal question
Page General » General Discussion
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