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Thread: Water Pressure Sensor issue? - Audible Warning w/all indicators ok?

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  1. Water Pressure Sensor issue? - Audible Warning w/all indicators ok?

    Hello Folks,

    Reaching out to see if someone can help me identify an issue I am facing with our 2001 Tige 2300 V Limited.

    The symptoms are as follows:
    Turn key to ON position, listen to beeps/checks - Start engine, less than 3 seconds later beep comes back on without any indication on the gauges of a problem with the engine.

    Have oil pressure (Just changed oil) - Over 40 with cold engine
    Water temp is in range 140-170
    Batteries charging 13.89 V
    Trans oil light is off

    I ran the boat (ignoring the beep) and it goes fine, no signs of any issues.

    I looked into the engine bay and around the last area I worked in (I replaced the starter on Friday), and I noticed there is a sender/sensor that my clumsy arse probably hit with a wrench... picture below. As you can see, it was well corroded and brittle, which is why it likely broke. The blue wire is missing the female connector and the sensor is missing the male prong where the blue wire would connect.



    The sender is on the fresh water circuit, on the solid pipe going from the impeller to the cooling system. It has two wires coming in to it, which are part of the harness, but I don't know how to tell much more that that from it.

    Picture is in a weird angle. You can see the knock-sensor on the top left of the picture, on the background. The hose in the front of the picture also picks up from the same pipe where this sensor is connected.

    I am under the impression this is a water flow or water pressure sender. I am almost certain this is the culprit of the never-ending beeping...

    QUESTIONS:
    Does anyone know what this is?
    How can I get a Part Number?
    Is this easy to replace? (Looks like I will need to splice the wire and put in a new terminal as well)
    Where do I buy it?

    USEFUL INFORMATION:
    Engine is a Mercruiser 350 MAG MPI - 315 HP
    Engine number is 0L678171

    Thanks in advance.




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  2. #2
    Join Date
    Jan 2004
    Location
    Mount Juliet, TN
    Posts
    2,407
    Boat
    Any
    88031 - Switch Assembly

  3. #3
    Join Date
    Aug 2010
    Location
    Long Beach, CA
    Age
    42
    Posts
    986
    Boat
    1999 2100i
    That switch pictured is the transmission temp overheat switch. The part number lee gave you is a Mercruiser number that also begins with 87-88031. It is on the trans fluid side, not the water side. To negate the beep in the meantime, connect to two spade terminals together.
    Fixing everyone elses boat just so I can use mine...

  4. Thank you folks. This is very helpful.

    I did a quick research online and found that there are two different temperatures for these. There is one on eBay that reads 195°F operating temperature, and another one on Amazon that reads 260°F.

    Which one should I be getting?



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  5. #5
    Join Date
    Jan 2004
    Location
    Mount Juliet, TN
    Posts
    2,407
    Boat
    Any
    The switch in his picture looks to be on the transmission fluid side not water.

  6. Quote Originally Posted by lee View Post
    The switch in his picture looks to be on the transmission fluid side not water.
    You're correct. It is on the trans cooler.


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  7. #7
    Join Date
    Aug 2010
    Location
    Long Beach, CA
    Age
    42
    Posts
    986
    Boat
    1999 2100i
    The temp will be stamped on the outside of the current switch but I would guess 195.
    Fixing everyone elses boat just so I can use mine...

  8. Quote Originally Posted by boatwakes View Post
    The temp will be stamped on the outside of the current switch but I would guess 195.
    Temp stamped on switch was 260. Replacement was $45 and is already back in.

    Thanks folks


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