Re: Yanmar 4JH5E sea water pump squeek
What donradcliffe says +1.
If the bearing weren't replaced, then most likely it is a bearing. Possibly the previous water leak kept a bearing lubricated enough to stop it squealing and is now it running dry.
All men dream: but not equally. Those who dream by night in the dusty recesses of their minds wake in the day to find it was vanity: but the dreamers of the day are dangereous men, for they may act their dreams with open eyes, to make it possible. T.E. Lawrence