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Winterizing the Marine Engine.... Please read if you are a DIYr.

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    Winterizing the Marine Engine.... Please read if you are a DIYr.

    For some of us it's time to start thinking about winterizing our marine engines.
    If in doubt, always refer to your engine model correct OEM service manual for the proper way to winterize your Raw Water Cooled Marine Engine and exhaust system.

    While adding AF to the system sounds great, possible dilution is the enemy.
    Remember.......while we can properly drain the system and add AF, just plain old AIR will not freeze expand and crack our expensive components.
    Never has, and never will!

    The AF projection against rust scale (during the lay-up duration) is paled by comparison to that which occurs during the normal boating season.
    If you insist on adding AF to your Raw Water Cooled engine, drain it again afterwards!
    As said, unwanted dilution could get you into trouble.

    While tempting, please DO NOT use one of the alleged Winterizing Kits that are are being sold as Camco, Starbrite, West Marine, etc.
    No matter how impressive the videos may be, these kits are a recipe for failure when used in the wrong hands.

    In October of 2012 I did a write-up regarding the use of these kits for the Raw Water Cooled marine engines.
    Please take a few minutes and read it. I go into detail as to why these can lead to failure.

    Fogging a V engine (carbureted engines ONLY):

    Fogging the marine engine is a dynamic process, and is typically the last thing on the list after the oil/filter change, fuel stabilization, etc.
    It is best done with the seawater pump disabled, and with a helper at the helm.
    All of this can take place within 10 to 12 seconds, so there is no concern about the dry exhaust system during the process.

    The helper will fire the engine up and will hold 1,100 RPM or so.
    You will spray the fogging solution equally into the each primary throttle bore.
    This is so that each plane (within the intake manifold) receives an equal amount of the fogging solution.
    If we miss one plane, we miss 50% of the cylinders...... ( 3 on a V-6 and 4 on a V-8 ).

    The helper will then cut the ignition while you continue spraying until the rotating assembly comes to rest.
    Cutting the ignition prevents combustion of the fogging solution.

    DO NOT roll the engine over once fogged.

    By the way, we DO NOT fog an EFI engine (be it MPI or TBI), in the conventional fashion.
    That requires a different process whereby an oil enriched fuel is added to the fuel filter cartridge, followed by engine operation.
    This is not fogging, nor is it as effective, but it does serve as additional protection.

    I may edit this first post.

    Rick E. Gresham, Oregon
    2850 Bounty Sedan Flybridge model
    Twin 280 HP 5.7's w/ Closed Cooling
    Volvo Penta DuoProp Drives
    Kohler 4 CZ Gen Set

    Is this something people do in the vancouver area? I thought it was just some oil changes and let it sit in the water until Spring, maybe even use it for a couple of winter fishing runs.