Tweet
I have a 2015 F250 and I was coming in yesterday and at idle the overheat alarm came on. Temp gauge on the Yamaha digital gages reads one tick past center and the temp gauge on my Garmin display reads just over 150 maybe 160. Brought if home and ran it in the tub and same result. Water is coming out the pee hole in a steady stream. Had the impeller and all pump components replaced last fall. Where do I start?
-
-
160 F on the temp is nowhere near overheat alarm,
which is >248 F
So it must be alarming because of one of the thermostat housing thermoswitches.
One possibility is a bad thermoswitch
you can remove them and check them on the stovetop -
they should not close - have continuity -
until they are hotter than ~180 F.
But another possibility
is that you don't actually have enough water flow into the block
even though you have a pee stream.
In that case, usually its the starboard side
that is short on water, and the thermoswitch trips.
The normal pressure in the block at idle is fairly low: 1-3 psi
so tough to measure with a gauge
Personally,
I would be dropping the LU
and inspecting that water pump;
impeller, plastic housing.
Maybe also check the Pressure Control valve. -
I have a gauge on my Garmin that just has a B on it and reads in PSI. I am assuming this is water pressure. It reads about 3-4 at 600 rpm if this helps???Comment
-
Replaced both thermostats and pressure control valve and ran at idle for about 10 mins and still get overheat alarm. The gouge is reading just above 130 not 150 like I originally posted. I replaced the pump and all related components last year before layup and have probably put 15 hours on engine. Could it still be the pump assembly? The pressure is reading 3 psi at idle.Comment
-
need to find out what is setting the alarm ,
then measure the temp in that spot with an infrared gun or something to see if that area is really getting hot enough to set the alarm.
or test the sensor or switch like was stated beforeComment
Comment