I am getting an overheat alarm after running my twin 2007 300s for a bit of time. I shut the engines down, restart the engine and in most cases everything is fine again until the next time. Water is coming out the side and when I feel the water, not excessively hot. I replaced the water pump recently and know it is getting good water flow. Any ideas how to troubleshoot and fix this problem?.
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Overheating Alarm - Port Engine
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water from the pee hole is not been through the head so it should be basically same temp as water you are running it in.
not a good indicator
maintenance?? when was the impeller last serviced? you mentioned recently.
biggest problem with overheating. the fins on the impeller lose their flexibility.
should be replaced either every year or every other year, depending on hours. Did you replace all the parts, not just the impeller itself? very important that all the mating surfaces match up correctly.
the other problem that has surfaced from time to time is the tube from the water pump up to the block. sometimes the o rings or the end of the tube doesn't mate correctly
Then after that .. there is the water pressure by-pass .. this can get stuck open with debris..
when is the alarm being triggered? when running? after running when you pull it back to idle?
Art
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You should check the thermostat to see if it is operating properly.
It is east to check by placing in pot of water and monitor water temperature with cooking thermometer as you heat the water and watch the opening of the thermostat to determine if it is operating at the designed temperature.
Jim
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I don't suppose there's a chance that you have gauges to actually display the water temp? Overheat alarm on our engines are tripped not only by an actual overheat condition, but also by a predetermined rise curve from the moment the engine is started. If the ECU determines that the water temperature is rising too fast to its operating temp, it will set off the alarm, even if the engine never actually gets too hot. It could just as likely be a sensor gone bad. But you know, there's only one way to be sure.
Also, the ECU monitors not only water temp but also exhaust gas temp. Either one will set off the alarm.Last edited by Harper; 06-29-2017, 09:05 PM.Mike
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Overheat Alarm
Checked everything as recommended, replaced all parts of water pump, replaced thermostats and exhaust sensors. Still get overheat alarm while running. Sometimes alarm when running about 4200 RPMs, other times at 2600 RPMs. Sometimes can shut off engine and restart to run fine for a period of times.
Thanks everyone for response.
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you mention you recently changed the water pump
did you do a total replacement .. all new parts or just the impeller
if you were not having an overheating problem prior to doing this, I would suggest pulling it back apart and inspecting it carefully and making sure the gaskets are all in place correctly, including the pipe that feeds water to the engine.
the next place is the high pressure by-pass valve.. see if something has it blocked in the open position
next pull the cover plate where the engine flush fitting is located.
water flows through that to the power head.. check to be sure it is not plugged and check for corrosion.. the backside of that compartment is the exhaust port..some of the models around your engine date had some problems in this area, which if corroded and created a hole, water gets dumped into the exhaust port and only a small amount gets through the engine.
inspect the thermostat .. however these usually get stuck in the open position if/when they wear out.
Art
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