Dark Spots on Cylinder wall

[Thackdaddy]

So the dark spot it just above the piston in every hole? So a piston close to the top has a spot near the top and one down in the hole has the spot lower? If so, it looks like whatever is caked on top of the piston has oozed off, puddled and evaporated. Liquid on the piston would drain to that spot.

I was able to give everything a good look and like you suggested it was just stained.

 

[coloradodave]

See post #13. Good call Doug. Eyes like an eagle...lol.