Raw water cooling issues?

[GroovyNautique]

Had my GT40 engine overheat on the weekend and searched the system and found that the strainer was loose, so I imagine it would be sucking air rather than water. I tightened that up and the engine cooled down ok at idle, but I didn't run it up again. Brought the boat home, double checked impeller and it was all good. New gasket and sealed the pump back up. My old temp gauge wasn't working so, bought a new Faria one to replace the VDO, same temp range.

Running boat in driveway and new gauge is reading 200 degrees running off of water hose and the water comes out in periodic gushes. I thought when I winterized it came out as a stream in idle, but my memory could be off. It's been a year!

So questions are: the Faria should be a straight swap for VDO over same temp range? should water be coming out in gushes or steady stream?

Also, should the exhaust hoses that go to Invertaflow exhaust system be stiff or soft? I have one that is soft and one that is hard as a rock. Yes, that sets up perfectly for a joke.

Thanks!

[jhersey29]

Exhaust hoses are stiff. The soft one is blistered inside and should be replaced.
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[GroovyNautique]

Ok, there is one answer down! Thanks!

I actually just checked the old gauge. Looks like I bought the wrong range. New is 100 - 250. Old one is 100 to 220. This should only make a 15 degree difference though, not a 40 degree difference. Assuming normal operating range is around 160?

[MTRBTR]

When I run my GT 40 in the driveway using the bucket method my water comes out in gushes as well with no overheat issues.

[GroovyNautique]

Ok, that is good to hear. Perhaps my sender is just inaccurate as the motor was actually fairly cool (couldn't feel a lot of heat coming off of it) even though the temp gauge was showing over 200 degrees. Perhaps I need a new sender?