My Yanmar 4jHBE temp meter has stayed steady for all the years I have owned my 42 Catalina. Last week I notice that, 1. When I turn on the key my meter
sometimes acts funny
pegging and then jump around and then settled down.
Last week I went aground and stirred up a lot of dirt shortly before anchoring
. The next day I did notice my temp meter was reading very hot so I slowed down and the temp moderated but not enough to my satisfaction. I anchored again and changed my thermostat and continued on (I have yet to test the old Thermostat to see if it is still good). The temp moderated even more, so I proceeded at a slower speed and the meter would move between normal (Which I think is 160F / 65C) and about 10 degrees above and back. I then changed the impeller (which the old one looked good). My Temp meter seems to still be about 10 degrees about what it should be. I was going to give my heat exchanger
an acid wash and when I removed the antifreeze
I could see my fresh water
side of the heat exchanger
was very clean and was contemplating pouring an acid wash through the saltwater side. I was wondering if anyone knew the normal temp for a Yanmar
4JHBE. I was also wondering if anyone had used and acid wash called ZIP (hydrochloric acid)?
Any information would be very helpful.