Thread: Water Temp

Results 1 to 8 of 8
  1. #1
    Member
    Join Date
    Jun 2004
    Location
    Woodbridge, VA
    Posts
    1,373

    Question Water Temp

    What should I see for water temperature on a 2009 Pro XS 250? After warm-up and a little running seeing 66 idle, 80 running 40 mph at 3700 rpm. Water temperature is 50. Using smart craft gauges. Air temp mid 50's.

    Thanks.

  2. Member
    Join Date
    Mar 2010
    Location
    Middleton, WI
    Posts
    49
    #2
    120* minimum at idle. You have an issue with a thermostat... should probably get it in right away or go to the FAQ if you wanna try cleaning them yourself.
    2016 Ranger Z520c/ Mercury Pro XS 250 (2B230637)

  3. Member
    Join Date
    Jul 2004
    Location
    Penn PA
    Posts
    15,189
    #3
    The running on plane temperature will always vary.The important temperature to achieve is 120*-135* at idle, when first starting the motor.



  4. Member fishnfireman's Avatar
    Join Date
    Apr 2005
    Location
    Amarillo
    Posts
    12,487
    #4
    Sounds like you have a T-stat stuck open.
    Was fishing this past week in 50-55 degree water - air temps from 35--70
    normal operating temps on mine while on plane was 118-125..
    I watch mine like a Hawk, already cold seized one due to a stuck T-stat--- Don't want another.

  5. Member
    Join Date
    Mar 2017
    Location
    Tuscumbia, AL
    Posts
    1,069
    #5
    Mine will get to 130-131 F then stabilize 123-127. On plane with water in the 40s it will go all the way down to low 80s high 70s.

  6. Member
    Join Date
    Jun 2004
    Location
    Woodbridge, VA
    Posts
    1,373
    #6
    Thanks for the info. Was going to drop it at the shop for the annual maintenance so just added it to the list.

  7. Member
    Join Date
    Oct 2012
    Location
    Ga
    Posts
    225
    #7
    These motors need 125-135 temps, especially on initial start up. Not as important running or re-cranking after everything has heated equally.
    Speed cost money. How fast ya wanna go? I have done so much for so long with so little. I can now do the impossible with nothing!

  8. Mercury 3L/4 Stroke/Verado Moderator EuropeanAM's Avatar
    Join Date
    Apr 2008
    Location
    Greenville, SC (US)
    Posts
    95,166
    #8
    Please see the Announcements at the top of the Forum, and provide the REQUIRED info when posting. Thanks!


    Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
    Still consider myself a "Marine Apprentice" after 47 years (learn something new every day).
    Mercury Parts, Mercury Outboards, Smartcraft & Accessories, Injector Service, TDR Reeds- BBC Sponsor