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  1. #1

    Default What should the operating temp be for a 272 Dearborn Interceptor marine engine

    I have a 1959 Century Resorter wood boat with a 272 (or maybe 292) Dearborn Interceptor V8. I cannot get it to run warmer than about 125 degrees F. I would think it should run about 160-180. My thermostats both start opening around 125 degrees. I知 thinking I need new thermostats. The thermostat OD is 40 mm so I知 having one hell of a time finding any. Does anyone have any thought on this subject? Much thanks.

  2. #2
    Join Date
    Mar 2009
    Location
    Portland, Oregon,
    Posts
    10,983

    Default Re: What should the operating temp be for a 272 Dearborn Interceptor marine engine

    General rule of thumb:

    Raw Water Cooled engine in river/lake water........... 160* thermostat.
    Raw Water Cooled engine in Ocean water.......... 140* thermostat as to minimize salt water crystallization.
    Closed Cooling System engine in any water........ 160* thermostat.

    I don't know what to say about the difficulty in finding a 40 mm stat.
    Good luck
    Rick ... aka Ricardo..... AQ series Volvo Penta repair
    Portland, Oregon
    28' SDN F/B w/ twin Volvo Penta 5.7L DP drives

    "Intellectual growth should commence at birth and cease only at death." Albert Einstein

    Please... no PMs! Post your questions on the forum.

  3. #3
    Join Date
    Sep 2008
    Location
    Maryland - USA
    Posts
    7,759

    Default Re: What should the operating temp be for a 272 Dearborn Interceptor marine engine

    there are a posts in the archive on getting a S/S stat from Napa & then grinding it to fit...

    The other option would be to contact one of the Y-block restorer spe******ts.....the internet will show you that path...

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