Water Pump pulley wear?

[Paul F]

I have had this boat for about three and a half years - In the last six months the water pump pulley has twice worn the shaft-hole flat slots off. This turns the shaft hole round making the pulley useless. The pulley then slips on the shaft stopping the water pump. Are there any solution?

 

[Paul Akers]

New Pump?

Maybe. But check with Yanmar. They may have a rebuild kit.

 

[Paul F]

Priced out new pump

Yes, new is always better - I priced out a new pump and it is around $320. I agree with you there must be a drag or hang up in the pump to "sacrifice" the pulley rather than hurt the pump shaft and other parts. This happend last night and I haven't had a chance to take the pump apart. It does seem to turn fairly easily by hand but there may be an obstruction inside. I was hoping someone could give me a resourse for a stronger pulley than the light steel one that Yanmar sells. In thinking it over the sourse of the problem may infact be the pump instead of the pulley??

 

[John T1594]

Fixed with a new washer

I had the same problem with the fresh water pump on my old Yanmar 2QM15. I found that when I replaced the pulley that there was still some play/wiggle when I tightened down the nut that secured the pulley to the shaft. I added a washer or two on the shaft and was able to then snug the nut up tight so that there was no play in the system.