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  #1   IP: 24.113.14.223
Old 09-07-2021, 12:45 PM
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Cooling system improvement

motor temperature gets up to140-155 degrees....my oil pressure goes from 50 down to 30 at 1200rpm and speed 5-6 mpg. Looking into a way to get some more air / water, giving some extra cooling capabilities to my old motor.
The ideas are:
- install an air intake pipe from the front of the windshield to the motor box
- make windows that can be opened
- look into getting improved water pump - what is the model of my water pump??!
- ....any more ideas??

My new alternator is working great!! Very thankful to everyone for your help!!
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  #2   IP: 165.225.20.159
Old 09-07-2021, 12:47 PM
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140-150F and 30 psi are (very) good values... why would you want to go lower? It may hurt your "mileage".

Great boat by the way
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  #3   IP: 24.113.14.223
Old 09-07-2021, 01:26 PM
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because I feel that the motor is so hot that the heat will melt all wires and hoses. Most the time I have the lid off the motor box, trying to get the heat out of there. I must add that this is my first year using the boat everyday for short runs. Finally managed to install the hour counter and have recorded 3.5 hours on it so far.
So basically I am learning the motor and the boat. With 25HP motor this boat should be going up to 17mph, and I had her going at that speed. But when motor gets to 150's she will not go that fast. Could be because of tidal currents or.......? I don't see any smoke coming out of exhaust, so the motor is strong. So I'm trying to make sure that all systems are working correctly.
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Old 09-07-2021, 02:04 PM
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The boat starts at 17 knots and then slows down?

140-150 degree temperature and 30 PSI oil pressure are well within the norms of this engine.
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  #5   IP: 47.142.133.29
Old 09-07-2021, 02:16 PM
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Venting the area around the engine will help dissipate the heat that is generated.
The running temperature of the engine is determined by the engin's (correctly working) cooling system not the ambinate temperature.
Maybe the packing is a bit tight or the exhaust system is not up to the job or ?. This is not meant to be diagnostic - I'm just guessing here........


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  #6   IP: 24.113.14.223
Old 09-07-2021, 03:24 PM
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Starting at 5mph and rarely go faster. Tonight will do some testing.
Exhaust is fine I believe, but shaft packing is tight, maybe too tight. I will loosen the nut some more.....just installed new packing a month ago......not getting any drip yet! The nut temperature started at around 140 deg, after few nut adjustments is down to 110........but still no drip!!!! .....
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Old 09-07-2021, 04:14 PM
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The nut and shaft should be 10-20 degrees F above the ambient water temp. Keep loosening.
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