NO, they have not
no, they do not, some of them
They are 55000hrs
Yes, We have ( oil analysis is attached)
They stick in service
Yes, it is.
We Send the head to a machined shop for repair, see the pictures please
We own natural gas engines (Waukesha), sometimes the exhaust/intake valves were stuck in the valve guides, Do you guys know the causes and solutions to solve that issue?