Yanmar Water Pump
I have a 1983 Yanmar 2GM - raw water cooled. I have been told by a mechanic that I am on the verge of needing a new water pump. I put a new impeller in the pump in the spring, he (mechanic) replaced it last week. He also reversed the face plate. He claims it is not pumping enough and the engine is running hot. I have checked in input and it is clean. It appears, to me, that the flow (out of the engine) is good. How can I determine if his assesment is reasonable? I would appreciate any guidance that can be offered. Thank you.