Dye and black lights.

[Mcstealth]

The mechanic pulled the prop on the  Aero Commander Darter I am (was) flying and said there is corrosion on the exposed part of the crankshaft. He then espoused almost gleefully of the impending teardown. I'm looking down at the color on the exposed journal with a skeptical grimace. I can barely feel anything with my fingernail. 

A friend has done some light reading on this subject, and says there is a procedure with dye and black lights to peer into the hole to see if there is any internal corrosion on the crank. Anyone have thoughts on this, or has done this procedure. Lycoming 320.

Thanks

David

 

Edited July 8, 2022 by Mcstealth

[RLCarter]

Sounds like Dye Penetrant maybe, I thought that was for cracks, corrosion in the bore of the prop flange is a big issue and on the Piper PA38 (tomahawk) it’s pretty common from what I’ve heard. If it’s not real bad there is a repair that is approved or at least for the Piper 

[Mcstealth]

I guess Mr Carter has the market on my question? Anyone else?