The discoloration is localized overheating of the lube film.
So if the pins are failing then you would have to make the guess that they are bending, due to the inertial loads at 15+K rpm.
When they bend the clearance will drop to zero ( or less ) inside the rod at the highest rotational load point,thus trying to crush the needles.
Keep doing this and the cyclic load will eventually break the pin, or lock up the bearing.
Either way 18mm isnt big enough,and or the pin material and its associated heat treatment are suspect.
Ive got a thing thats unique and new.To prove it I'll have the last laugh on you.Cause instead of one head I got two.And you know two heads are better than one.
Bookmarks