4.3L MerCruiser overheat, something different

[romad69]

I have a 2002 crownline with 4.3 Merc/Alpha 1. It gave me an alarm the other night while coming back to the dock. I noticed the temp gauge was high and pulled it out of the water. I figured to change the impeller and see where to go from there. In the process of changing, I noticed that the plastic tube connecting the pump upper housing to the copper water tube had melted. The impeller was in good shape (changed it anyway) But I have no idea what caused it to melt, and what to do to fix it. Any help would be welcome.

 

[Peter1959628]

Re: 4.3L MerCruiser overheat, something different

I had one where the tube was non-existent whilst changing the impellor.<br />The kit should have a tube (i believe) that inserts into the top of the pump body,this too was in poor shape. Make sure you have no blockages and you should be fine.<br />Dont forget the "o" ring on the side that seals upper/lower halves on re-assembly.<br />Hope all is well now after replacement.