I know this is a 4 year old thread but it fits perfectly with some thing I have been concerned about.
mate has a mid 80s Yanmar
2GMF just like mine. Last year his recirculating water pump
, the one with the metal impeller failed.
The bearing had disintegrated and destroyed the pump
.A new pump
was $600 cnd!
It would be much cheaper to rebuild
this pump and install a new bearing before it fails and damage's the shaft etc.
Is this a fairly common failure? It seems like replacing a 35 year old bearing would make sense.
I did the fresh water pump
using an $85 dollar kit from Yanmar. it worked much better after that.
This is what it looked like.