Hello and thanks in advance for any advice you may have. <br /><br />Yesterday I replaced the water pump in my Yamaha and today when I checked the motor on the hose I noticed a knock in the lower unit. It only knocks in drive and isn't a constant thing, but I'm concerned. There is a little play in the prop - in and out, not side to side. It may have been knocking for a month or two, but I haven't noticed it until this morning. Here are my questions:<br /><br />Could I have botched the waterpump job so badly that I messed up something in the lower unit? The pump is working fine now, but I had some trouble getting the old one out and pounded on the shaft holding it a bit.<br /><br />Do you think my lower unit is about to sieze up?<br /><br />Should I run it the way it is, or take it in for service?<br /><br />Lastly, anyone know a good mechanic in the Houston area?<br /><br />Thanks again,<br /><br />Brett