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  1. 04-20-2018, 11:20 PM #1
    NOTGSXR
    NOTGSXR is offline
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    Finally looks like I got my wp issue fixed and low temp idle also...

    Ever have a pair of thermostats go bad? 2004 Merc Racing 250xs

    S/N 0T819373

    Since I got it it never got over 105 idling . Water pressure was always low too...

    Cleaned Thermostats and same problem.. This year i wanted to be more pro-active a nd find out why it didn't ever heat up like it should..

    Well... with some help from Sanderson Marine in Chester VA... I replaced both thermostats and wow... it works now..

    Very strange to have them both go out but they did..*

    Hope that can help someone else out sometime...


    Dan
    Allison XB21 Prosport Mercury Racing 250XS with a 1.75 Sporty
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  2. chad202
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    #2 04-21-2018, 06:50 AM
    When you say bad, did you test they are opening before there setting or both of them just didn't shut off positively?
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  3. NOTGSXR
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    #3 04-21-2018, 07:06 AM
    They appeared to open way early and never close or just never closed really. Boat would get up tyo say 95 max and just sta y at that temp. No cycles.. wp was about 1.5ish.

    Now after changing thermostats.. temp goes up to 138 first time then wp drops from 3 to 2.5ish and temp goes down to aboutv121.. then the temp goes up to about 130ish and the thermostats appear to cycle as designed.
    Allison XB21 Prosport Mercury Racing 250XS with a 1.75 Sporty
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  4. fishnfireman
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    #4 04-21-2018, 09:00 AM
    Fairley common especially with the sportsmater.. Just one of the t-stats not functioning properly for any reason will cause the same issue.
    Need to watch the temp on these motors like a Hawk.. It can ruin a powerhead faster than I can type this.. Been there done that !!!
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  5. rocketmanjp
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    #5 04-21-2018, 03:40 PM
    Yea, you lucky you didnt grenade that thing! Glad you got it fixed.
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  6. chad202
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    #6 04-21-2018, 05:31 PM
    yep, very lucky you didn’t stick a piston.
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  7. NOTGSXR
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    #7 04-21-2018, 05:46 PM
    I did always let it idle a long time each run... maybe that was the saving grace...
    Last edited by NOTGSXR; 04-21-2018 at 06:46 PM.
    Allison XB21 Prosport Mercury Racing 250XS with a 1.75 Sporty
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  8. NOTGSXR
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    #8 04-21-2018, 06:47 PM
    Ran it in some cold cold water too... eek
    Allison XB21 Prosport Mercury Racing 250XS with a 1.75 Sporty
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