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  1. #1
    Join Date
    Nov 2008
    Location
    Walkersville,MD
    Posts
    618

    Default Direction of thermostat

    I think my thermostat was installed backwards! The'cone' shape was towards the raw water pump and the thermostat says this side to radiator on the opposite side, the side that was toward the engine. The motor has run a bit on the warm side all season, 180 degrees with a 160 tstat. Anyone have any insight?
    -Rich
    1990 Supra Mariah/351 PCM 1:23-1 PCM

  2. #2
    Join Date
    Apr 2012
    Posts
    223

    Default

    What motor? Are you running hard? My boat has always ran 170-180, especially if im pulling hard with extra ballast.

    If the lught isnt going off and the oil pressure is normal, i wouldnt worry

    Sent from my SM-G920V using Tapatalk

  3. #3
    Join Date
    Jul 2007
    Location
    Flowery Branch Georgia
    Posts
    2,742

    Default

    Sounds like it is upside down .

  4. #4
    Join Date
    Jun 2012
    Location
    Knoxville TN
    Posts
    1,415

    Default

    170-180 is not bad. Gauges are not exact.

    Around 200, better shut it down.

    Good thing that's an easy fix. Sometimes the longest part is getting the old gasket scraped off.


    Sent from my iPhone using Tapatalk
    Last edited by MJHKnox; 10-20-2016 at 10:35 AM.
    2018 Supra SL400

  5. #5
    Join Date
    Nov 2008
    Location
    Walkersville,MD
    Posts
    618

    Default

    Thanks for the replies, I will re-install the other direction in the spring and watch the temp closely.
    -Rich
    1990 Supra Mariah/351 PCM 1:23-1 PCM

  6. #6
    Join Date
    Jun 2012
    Location
    Knoxville TN
    Posts
    1,415

    Default

    Quote Originally Posted by Blackntan90 View Post
    Thanks for the replies, I will re-install the other direction in the spring and watch the temp closely.
    Watch as the temps rise, then 'level-off' when it opens.
    Temps should be steady, unless you are putting a big stress/load on the motor.

  7. #7
    Join Date
    Jun 2002
    Location
    Canton, GA
    Posts
    243

    Default

    While you have it open.... I would replace with a new thermostat. They are pretty cheap and the do go bad.

  8. #8
    Join Date
    Nov 2008
    Location
    Walkersville,MD
    Posts
    618

    Default

    ngavchris, I replaced it last year and always pull it at the end of the season to inspect and winterize. I will buy a spare for next season just to have aboard for peace of mind.
    -Rich
    1990 Supra Mariah/351 PCM 1:23-1 PCM

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