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  1. #1
    Join Date
    Oct 2005

    Closed Cooling on a 496 MAG Question

    I am lost on this, hopefully someone can explain this to me.

    Assume 90% use in ocean saltwater. On bigger boats with inboards, it is my experience is the heat exchanger takes all the abuse from the salt water and replacing heat exchanger/seacock parts was justified because it was cheaper than engine block parts.

    A 496 MAG must have a heat exchanger, right?

    And if so, can I flush that portion to keep it clean and salt free?

    Also, is there a seacock through the hall or just the intakes on the drive, like raw water cooling?

    Thanks in advance for helping me understand this


  2. #2
    Registered Anarchy Powerboats's Avatar
    My Boats:
    Join Date
    Jun 2004
    Phoenix, Havasu, Newport

    Re: Closed Cooling on a 496 MAG Question

    yes, you can either pump it out with the valve on the exchanger and the attached hand pump or you can slap some muffs on your out drive and flush it normally at the wash rack, either way is fine.

  3. #3
    Registered Harper220's Avatar
    My Boats:
    2001 28 TD Daytona
    Join Date
    Jun 2003

    Re: Closed Cooling on a 496 MAG Question

    Flush with muffs first to get rid of the salt water and then pump that out with valve and hand pump would be the best.

    Just pumping out the salt water without flushing would still leave salt on everything.

  4. #4
    Forum Regulator VIP Member Sydwayz's Avatar
    My Boats:
    37' Active Thunder AVH; 17' Speedliner Cat OB
    Join Date
    May 2001

    Re: Closed Cooling on a 496 MAG Question

    Chris, I responded to your other post. I installed a fresh water flush fitting right before my sea water pump to run the engine on a hose, and flush all of the sea water portion.

    As for the pump out option with the air pump fitting. I would be more inclinded to leave salt water in the salt water side, rather than pump it out. When you pump out the salt water, you expose the salt treated metal to air, which accelerates rust and corrosion. Yes, leaving salt water in there is bad too, as flushing with fresh water is the only way to go, but having it dry with just salt sitting on the metal is the worst.

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