[PileusD36]

Just replaced the water pump on my 34' Peterson (Yanmar 2qm15 wth seawater cooling) All seems well but took her for a ride this morning and the Water Temp. Light came on after about 30 minutes at 2200 RPM. Had temp gun and the highest temp on the engine I could find was 138 degrees F. I will replace the temp gage tomorrow.
Fellow sailor at Marina suggested that I might have to desalinate the engine.
Two questions:
1. Is there an accepted procedure for this and can I do it at the Marina?
2. What is the normal cruising RPM for this engine?

 

[PileusD36]

Thanks. I do not have a gage. Only a warning light. The temperatures I was quoting were from heat gun.

 

[PileusD36]

I pulled the sensor, mucked out the chamber and replaced it. It was really in bad shape. Took a 5 mile ride at 2200 and no red light. Hopefully I got it fixed. Looks like I may have to do the engine like Rockter suggested as there was a lot of gunk Did not have time to test the sensor but will look at doing that next week.

 

[PileusD36]

BTW still looking at proper cruising RPM.

 

[PileusD36]

OK now I need to know what the best de-scaling liquid is please. Will try to flush the engine this weekend. As well, what temperature is the thermostat set at. I will replace it as well but the parts person did not have that information.

 

[PileusD36]

Zincs were changed a couple years ago I believe. Have them located but having a real hard time getting them lose. 22mm square head on the covber.