On a separate thread I had a lower unit gear issue, that was solved (with the help of this forum) and the lower unit was replaced. I now have an issue with an overheat alarm, and blinking temp signal on the display that appears and sounds 5-8 minutes after the engine is started. If I turn the engine on, and go into gear within a few minutes, there is no alarm or overheat signal on the display. So the alarm is only sounding when in neutral for a period of time just after I start the engine. If I put the engine in gear before the alarm goes off, and run it at cruising speed, the alarm does not sound, and after cruising for 20-30 minutes the engine can be put in neutral with no alarms (tested in neutral for 20-30 minutes as I came back into harbor on one engine with problem engine in neutral). Next day at dock, turn engine on, wait 8 minutes, and alarm goes off. Turned off, get to harbor mouth on one engine, turned back on and soon after put into gear, no problems cruising for day.
I first cleaned and replaced the PRV, and thought it was solved at dock after a 10 minute time with no problems. When I came back next day, before I could get out of the harbor alarm sounded. I ordered and replaced all the parts to the PRV (spring, gasket, rubber) except the plastic center valve which had been ordered incorrect and so did not arrive with the other items. No change, still overheating in neutral. I did not yet replace the center plastic valve, but I am not sure that will fix my issue.
Any ideas for my next steps would be appreciated.
I first cleaned and replaced the PRV, and thought it was solved at dock after a 10 minute time with no problems. When I came back next day, before I could get out of the harbor alarm sounded. I ordered and replaced all the parts to the PRV (spring, gasket, rubber) except the plastic center valve which had been ordered incorrect and so did not arrive with the other items. No change, still overheating in neutral. I did not yet replace the center plastic valve, but I am not sure that will fix my issue.
Any ideas for my next steps would be appreciated.