You have a DF140?
So no overheat alarm. It can take a while.. 5 minutes or more..
Its hard to wait til it overheats. A non-contact thermometer is a great tool.
The impellor could be bad.
The water inlet can be obstructed by seaweed.
The T stat housing could be clogged
The hose to the pee hole could be off and the water running inside the cowl.
The pee hole being obstructed by debris, if thats the problem, will not effect the motor in the least. The pee hole is a telltale. It lets you SEE that water is pumping. If it is just the pee hole blocked, but the water is pumping, the water still goes thru the head and out the exhaust and cools the motor.
You hooked the hose to the flush port right?
It didn't pee on the flush port? That would indicate blockage.
Did water come out the prop?
If the impellor was bad it would still pee on a flush port. Your impellor is new and they (usually) last a few years.
The "pee" overflows at the T stat (even when the T stat is closed) The T stat housing can get gummed up with salt goo and the water doesn't overflow to the pee hole. If its really bad, it doesn't flow thru the tstat
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