The heat switch on my Yanmar
2GM20F threads into the thermostat housing and I understand it works by using thermal expansion material that makes the contact when it gets too hot setting off the over-heat alarm
My old one broke (expansion material chipped off along with the wire connector), and in replacing it I could not figure out how far to thread it in. I stopped with a reasonable amount of tightness.
Fired it up and didn't run for five minutes before the alarm
went off. (Engine wasn't hot), so disconnected the wire and went sailing for the weekend with no problems.
Question: Do I back the switch off, (unscrew it) until it stops sending the alarm? How do you know when to stop tightening?
The color of the expansion material was yellow instead of green in this switch, could it be a different temp setting?
Could it be that my thermostat isn't opening at a low enough temp setting off the alarm after just a few minutes?
I thought I had this fixed! Arrrr