Dunno about the springs, will leave that to others. (Though I'm curious to see/hear more about how exactly they are set up and what they do in the cooling system.)
Two questions:
- I take it that you have observed that the boat didn't do this before, and now it has started?
- Does anything overheat, or do you just see a temporary spike that goes away in a minute? If so, how high does it go?
My inline sixes both did that. I never sweated it because it only went up to the green/red split on the gauges, and always went right back down within 1-2 minutes.
"I don't have time to get into it, but he went through a lot." -Pulp Fiction