OMC KC 460 overheating

[JTKC]

Been a long road but finally nailed it down to the suction side of the raw water pump. Its definitely breaking suction above 3k rpms. Hoping to have it fixed by Labor day. I really appreciate all your help! Just need to locate the parts.
Thanks for your help and advice!

 

[Lou C]

https://www.crowleymarine.com/johnson-evinrude/parts/53981.cfm?mdl=PNLH3I

OK one last thing and this is something I do when I change the impeller. If the gasket around the housing gets shifted when installed it can leak and allow air to be pulled in. So when you run the boat on the ear muffs, remove the plastic cover and look at the impeller housing when it's running. If there is any water leaking out around the cover that gasket may not be sealing. I have found that its easier to install them if you put some OMC/Evinrude triple guard grease in the groove in the impeller housing...it holds the o-ring gasket in place and it won't shift out of position which sometimes happens if you use the gasket sealer specified in the shop manual.

part # 20 is the housing and part # 18 is the o-ring gasket.