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  1. #1

    Default Mercury Classic 50, 45 hp, 87-89 year

    serial # 0C145238
    I noticed water coming out of COVER ASSEMBLY, Cylinder Block by #1 spark plug. the previous owner had applied silicon where the gasket was leaking.
    while removing it i broke a wire coming off some type of sensor located next to plug #1 the cover has an opening made to fit around the sensor and plug #1.
    Could some one please tell me what is the name of the sensor and what does it do, i grounded the wire with motor on and it kept on running,, with motor off and ignition key on and i heard something making a very slight noise when i grounded the wire...... also i think the motor is an 89 but would some one know from the serial # what year it is??

    thank you
    joe
    Last edited by carolynandjoe; June 23rd, 2009 at 10:12 PM. Reason: bad spelling

  2. #2
    Lieutenant Junior Grade corm's Avatar
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    Default Re: Mercury Classic 50, 45 hp, 87-89 year

    Hi,
    That was your over heat sensor.
    This is free internet advice.

    Have Fun,
    corm

  3. #3
    Lieutenant Commander AMD Rules's Avatar
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    Default Re: Mercury Classic 50, 45 hp, 87-89 year

    That's a really late 1989 model. Must be one of the last 45hp motors built.

    Sensor is your temperature switch. There are two versions, each are about $50 to replace:

    96829A 1 260 Tan
    16775A 2 300 Tan/Green

    When grounded, you should hear an alarm.
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  4. #4

    Default Re: Mercury Classic 50, 45 hp, 87-89 year

    I can't thank you guys enough, great info and fast..... You guys are great.

    joe and carolyn

  5. #5
    Seaman cat toon's Avatar
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    Default Re: Mercury Classic 50, 45 hp, 87-89 year

    Great Info here thanks for the replies you give the people

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