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Yes, it is on tight. There is very good flow going through the engine. I am thinking there might be not enough contact time without the thermostat to restrict it.strainer cap on tight?
It runs between 140/150 w/o thermostat. We ran a garden hose through the risers and there are no restrictions. We have another boat with same engine and the engine maintains 140 with a thermostat. I have ordered a new marine thermostat and hopefully this solves it. I did put a new thermostat in and it ran at 180. I suspect the thermostat may have been sold tostrainer cap on tight?
The thermostat was a 143 degree, the risers are cast iron and 3 years old.A garden hose, especially one fed off city water makes a helluva lot more pressure than a floppy vane raw water pump, especially after the pressure drops in a RWC system. if the new t-stat you had in there was a 180 deg F version, you may be on to something....i've never seen a marine thermostat for a gas engine that was rated that high.
Yes and it is clear.143 degree thermostats are usually marine so that isn't likely to issue.
Have you checked the oil cooler?
Thermostat outlet, where the exhaust manifolds are fed from - is it a poppet valve design?
All clamps are tight, now you understand our frustration!Damn...not much left...is the raw water pump installed correctly? all hose clamps in working order and tight?
might want to call the skidim shop and get their two cents
Thanks. Great suggestions, will try after my vacation.ok...how bout you get an IR thermometer gun and take some measurements...
I'd also MEASURE the output of the raw water pump to MAKE SURE it is adequate.
The other item that is useful in finding the issue is a clear piece of tubing that you temporarily replace the black rubber hose with. lets you verify a solid stream of water is flowing between any two parts.
How's it cooling???