Water temp question
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Water temp question

  1. #1
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    Default Water temp question

    I am totally lost...I have a medalian water temp gauge that isn't giving me a reading. I took the sensor wire off...grounded it, and the gauge spikes, no problem. I have replaced the sending unit from a GM truck (same as I always ran)...and nothing...no reading at all.

    Where do I look next?
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    mo balls than $cents$ IMPATIENT 1's Avatar
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    Thermostat kit on motor ?? If not slow down how much waterflow the motor gets from the pump till desired temp is met.

    Dare to be different, if it turns out great you can claim you planned it that way.

    Jetboatperformance.com
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    No thermostat...but I know the water is getting temp...I am just not getting a reading on said temp for some reason.
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    Quote Originally Posted by terrible_buddhist View Post
    No thermostat...but I know the water is getting temp...I am just not getting a reading on said temp for some reason.
    If youve got the heads dumping water independently id look and make sure both outgoing dumps are actually dumping water. If they are and you can ground the sensor circuit and peg the gauge, then youre simply putting too kuch flow into the motor and not heating it up.

    Dare to be different, if it turns out great you can claim you planned it that way.

    Jetboatperformance.com
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    I would assume that the sending unit isn't being screwed into something plastic and is creating a ground for itself when it's being installed? Seen too much pipe tape or thread sealer used and create a problem before.
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    I do not think a Medallion gauge uses the same sender as a GM truck.
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    Quote Originally Posted by gregb View Post
    I do not think a Medallion gauge uses the same sender as a GM truck.
    This could be the other problem. I'm not sure it will work either and unless you can find out the ohm range of the gauge and mate it to the correct sender your playing the guessing game. Taking it a step further....if you get something to work, is it reading the correct temp?
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    Put the hooked up sending unit in some hot water see if it works if so check and see if water is getting up to the sender
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    Quote Originally Posted by BGMAN View Post
    This could be the other problem. I'm not sure it will work either and unless you can find out the ohm range of the gauge and mate it to the correct sender your playing the guessing game. Taking it a step further....if you get something to work, is it reading the correct temp?
    very good point.
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    Quote Originally Posted by gregb View Post
    I do not think a Medallion gauge uses the same sender as a GM truck.
    Good point. alot of gauges will not work with a different sender especially a factory sender. I had a problem with a factory sender and an aftermarket guage. I purchased like sender and all the numbers got correct. Also on a side note, Jet boats are taking water from (for the most part) from a cold water source and getting the engine to warm to a temperature that it is designed to run at is not easy. Alot of people recommend limiting water supply which will create hot and cold spots in the engine. You are better of holding the water in the engine longer for even temperature throughout the block and heads. Then valve the exit water for a even water flow and even temperature through out the whole engine. There are alot of ways to plumb a jet boat depending on if they are running logs or headers. Good luck!!!!!! Mark
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    Quote Originally Posted by ol guy View Post
    Good point. alot of gauges will not work with a different sender especially a factory sender. I had a problem with a factory sender and an aftermarket guage. I purchased like sender and all the numbers got correct. Also on a side note, Jet boats are taking water from (for the most part) from a cold water source and getting the engine to warm to a temperature that it is designed to run at is not easy. Alot of people recommend limiting water supply which will create hot and cold spots in the engine. You are better of holding the water in the engine longer for even temperature throughout the block and heads. Then valve the exit water for a even water flow and even temperature through out the whole engine. There are alot of ways to plumb a jet boat depending on if they are running logs or headers. Good luck!!!!!! Mark
    Right now I have twisties on it...which I freaking hate...I want my logs and turbos back! But I have the water going into a T with a pressure dump...into the block...out of the intake...overboard. I have a pickup under the boat going into the twisties.
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    so how do I figure out the correct sending unit?
    http://www.amazon.com/Sierra-Interna...ct_top?ie=UTF8
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    That should work. If you don't want to wait and there's a West Marine close by they should have a teleflex brand sender that would work also.
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    am I looking for single or dual station?
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