6-71 Gray Marine Diesel Engine cooling system ?

Discussion in 'Motorsailers' started by Arnaud2023, Aug 6, 2023.

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  1. Arnaud2023
    Joined: Aug 2023
    Posts: 3
    Likes: 0, Points: 1
    Location: Norway

    Arnaud2023 New Member

    Hello everyone
    I have a 6-71 Gray Marine Diesel Engine which I think is after 1970. I am new to this engine and I really need information on the cooling system first.
     
    Arnaud2023, Aug 6, 2023
    #1
  2. comfisherman
    Joined: Apr 2009
    Posts: 652
    Likes: 331, Points: 63, Legacy Rep: 10
    Location: Alaska

    comfisherman Senior Member

    Keel cooled or raw with exchanger? Blower? Turbo? Water jacket manifold? On block gear cooler?

    I've owned or engineered on boats with Detroits for near 20 years, only pulling my last 71 series in 22'. They are almost like Lego in ease of configuration, but there were many options. Can't really help without a bif more info.
     
    comfisherman, Aug 6, 2023
    #2
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  3. Arnaud2023
    Joined: Aug 2023
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    Location: Norway

    Arnaud2023 New Member

    Arnaud2023, Aug 6, 2023
    #3
  4. comfisherman
    Joined: Apr 2009
    Posts: 652
    Likes: 331, Points: 63, Legacy Rep: 10
    Location: Alaska

    comfisherman Senior Member

    Ah I see the pics are now up.

    While it's not a common engine today it rules the seas for 30-40 years. Guessing a standard keel cooled 671 near 150-175 hp. Usually has that front and center expansion tank.

    I recommend getting on ebay and finding an old service manual they look like this.

    Detroit Diesel Engines In-line 71 Service Manual | eBay https://www.ebay.com/itm/314370851212

    They will have decent albeit old pics of each system, my memory is waterjacket, oil cooler, wet manifold but it varied depending on integrated Trans cooler or remote.
     
    comfisherman, Aug 9, 2023
    #4

  6. Arnaud2023
    Joined: Aug 2023
    Posts: 3
    Likes: 0, Points: 1
    Location: Norway

    Arnaud2023 New Member

    Hello Comfisherman
    Do you have a Wathsapp?
    We could communicate live?
    Thank you for your participation? And for your advice
    Regards
    Arnaud
     
    Arnaud2023, Aug 9, 2023
    #5
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