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Thread: 6v53 natural

  1. #1

    Default 6v53 natural

    Can anyone tell me what the “overheat temp” is on 6v53n Marine would be. I know the range is 160-185. But what’s to hot?

  2. #2
    Join Date
    May 2015
    Location
    Oregon
    Posts
    108

    Default Re: 6v53 natural

    At 185° the thermostat is wide open. Any more heat and more strain is put on seals and gaskets. While most diesels run more efficiently at hotter temps, about 210° or so, Detroit doesn't like it. And you need to have additional cooling ability so the temps don't get away from you. You can get cavitation damage on the water jacket without an anti-cavitation additive in the cooling solution. Usually not a problem in naturals at designed temps but happens in turbo models.
    I ran 6v53 naturals in Vietnam in hot weather and 80° water. Flat out for more than a few minutes and the engines would climb 20-30°. They didn't boil over, but they also didn't go 10,000 hours. More like about 3-5000. The alloys of combustion parts in Detroits have a good temperature range, but high coolant temps also means high exhaust gas temps, and that kills engine life.

  3. #3
    Join Date
    Nov 2009
    Location
    temecula, ca., usa
    Posts
    3,100

    Default Re: 6v53 natural

    The old 71's I worked on....as well as the later ones and 92 series had overheat warning switches set at 215⁰f. By today's engine standards, that's about.20⁰ early but as Lepke points out these old gals like it cool.
    I hope this helps.
    Good luck.

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