I replaced both impellers on my Monterey 322CR before launching this year. I initially had problems with the port side engine impeller not priming properly. Had to suck water up the hose going into the thermostat housing to get the pump primed. After running for just a short bit, I noticed the temperature climbing and found the hose again was dry. The impeller was not seating properly and not pumping water. I put back in the old impeller (thankfully I kep t it) and the old impeller works fine. Visually the two impellers appear identical. Has anyone ever experienced a similar problem? A mechanic suggested the pump housing was worn causing the new impeller not to seat properly.
I am also having problems with the starboard engine when running at 3000 rpm it starts to overheat. Appears to be getting water properly at idle and does not overheat. The boat is a 2003 and I just replaced the risers and thermostats on both engines. Can't come up with why the starboard is overheating. Any ideas? Same mechanic speculated I might have a hole in a hose in the outdrive. Perhaps when the boat gets up on plane and the outdrive is partially out of the water the hose might be letting in air.