raw water flow

I installed a fresh water system to 1. flush out salt water before leaving the boat after a trip. 2. winterizing the engine and all plumbing threw out. 3. when I need to diagnose problems with RAW water pumping properly threw engines pump. Case and point: My 2GMF started to lose raw water...

Hello, I just changed the impeller and gasket in the raw water pump on our Yanmar 3GM30F. Before the service the raw water flow was great in terms of volume and frequency. After the service, it decreased to a trickle with lower frequency. There's a clear clear "before and after", leading to...