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Clacking and knocking noise

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baitweller

New member
Hello all, I have twin '99 OX66 250's. I just put in new water pumps and all went well until I put her in the water. When I put it in gear, there is a "knocking /clacking" noise in the mid-section of the starbd motor. runs great but puzzled at what the heck I broke??? done this countless times and never has this happen. My local mech shop says "prop chatter" or a loose bolt in the mid section. Anybody have an idea where to start
Thanks Baitweller
 
With some Yamahas if you don't push the 'retaining ring' on the top the the water pump housing down hard enough you will get some 'shaft rattle'. When you fit the ring (and the impeller) you should pull up on the shaft and push the ring (and impeller) firmly home at the same time. I haven't had this issue myself but it is well documented in various forums regarding water pump servicing etc.
 
aliboy: THANK YOU ! I'm going to do it again and see where I messed-up. I hope it's that simple (insert cheap) to fix.
will let all know this weekend.
Baitweller
 
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