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  1. R

    T-Stat for closed loop cooling system?

    Is the 153 degree F running temperature in lieu of 165 -170 a big deal? Does it result in a loss of power?
  2. R

    T-Stat for closed loop cooling system?

    Thanks. The model number is MFH-5374. I checked the installation instructions on Monitor’s website and they state the t-stat is no longer installed in the intake manifold as the system comes with a new manifold cover elbow to replace the old t-stat housing and the t-stat is now included in the...
  3. R

    T-Stat for closed loop cooling system?

    That was helpful (Not!). An experienced marine mechanic who was recommended to me installed a new engine in my boat 7 years ago and added the closed loop system, but did not install a t-stat. When I called him recently to find out why, he said it was too long ago and he couldn’t remember.
  4. R

    T-Stat for closed loop cooling system?

    The brand appears to be “Monitor” and the HX is 5” in diameter and 21” long. What do you mean by keed?
  5. R

    T-Stat for closed loop cooling system?

    An aftermarket closed loop cooling system was installed on my 1998 Mercruiser 7.4l engine about 7 years ago. I recently replaced the water pump and thought I would replace the thermostat while I was at it. There was no thermostat installed. The boat has been running at about 153 degrees F and...
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