We are stuck in trouble shooting of a Cummins KT19 Marine High Speed Engine on our vessels.
The engine runs without load i.e without engaging the propeller and reaches its max running RPM of 1800.
When the engine is on load , the max RPM attained in only 950.
Cummins’s engineers checked the engine and its parameters which were found to be perfect.
Reduction gear was checked and is OK
Propeller is 4 blade , 2 of the blades are damaged and cut but we are not sure if the problem is really in the propeller.
Brainstorming on the problem will be appreciated.