Originally Posted by
Tankengine
Does not lead aid in piston-cylinder lubrication as well?
The OWT rears it's ugly head once again. No it does not provide lubrication.
The mustering machines are worked very hard.
The recording of flight hours leaves a lot to be desired.
Low time pilots are the norm for the industry.
If it still flies it must be serviceable.
The damage to the valves is indeed interesting, there doesn't appear to be pounding of the seat or tuliping of the valve head.
The broken/pitted edges seems more mechanical damage rather than over heating.
FWIW