Mercury Overheating problem - Page 2
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  1. #11
    Senior Member
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    Oct 2008
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    Re: Mercury Overheating problem

    Not trying to take over this thread but how do you tell if your motor is over heating if you dont have a temp gauge?

  2. #12

    Join Date
    Dec 2008
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    182

    Re: Mercury Overheating problem

    same thing happend to my mercury 225 and i took to austin boats and motors and they said thiers water in the gas tank we drained the gas and never heard the alarm again

  3. #13
    Dez
    Dez is offline
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    Re: Mercury Overheating problem

    Quote Originally Posted by 735B5A51725D475C5D5A340
    Not trying to take over this thread but how do you tell if your motor is over heating if you dont have a temp gauge?
    When it catches fire ;D ;D

    Seriously it's pretty difficult w/o a temp guage. By the time you figure out it's running hot you may have already scored pistons or sleeves. I'd suggest getting a guage and sending unit. They make universal sending units that bolt onto the block and the wiring is very simple, one wire to the sending unit and power to the guage. Just be sure to buy matching guage and sending units or the temp won't read correctly...




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  5. #14
    Super Moderator
    Join Date
    Oct 2006
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    1,012

    Re: Mercury Overheating problem

    my overheat alarms are suppose to go off at 195* F. I pulled them out of my engine block on both the port and starboard side and put them in a pan of boiling water to make sure they triggered the alarm correctly. You can test this with them hooked up to the boat and the key in the "on" position without the boat running. You can also check it by disconnecting the sensors and watching the resistance (ohms) change between the two leads. It should have a high resistance measurement when it's below the alarm trigger temp and a low resistance when above the trigger temp. It's definitely good piece of mind to know your temp sensors are working properly AND your alarm buzzer itself is working correctly. It either fail you're going to overheat and not know it.

    -Rich

  6. #15
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    Re: Mercury Overheating problem


 

 
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