If you have a "half" system, you must still drain the exhaust manifolds. The Bravo raw water pump WILL NOT draw liquid from the drive to the raw water pump and you'll damage the impeller in mere minutes if you try.
If you decide to do that, you must fill the raw water lines from the drive to the pump (by pumping it with "muffs' etc and/or siphon). Or you can flush the entire raw water system with a suitable antifreeze. Mercury / Mariner / Quicksilver Spare Parts. Raw water does pool in the connecting hoses from the raw water pump to the oil and power steering coolers though and you MUST ensure that they are absolutely clear of raw water, I have disconnected the raw-pump discharge and used a wet-or-dry VAC to suck all the water from there. There's really not much to winterize.(except the 18 items in the link above!!) The heat exchanger and risers drain from gravity (but remove the HE drain plug to check!!) Winter storage is a great time to have this. With proper coolant and antifreeze, you can eliminate the risk of freezing except in sub. The good news is you can prevent freeze damage fairly easily.
Freshwater cooled engines without proper coolant can freeze below 32☏ (0☌). Manufacturers recommend water pump impellers be replaced every 2 years. Unwinterized boat engines can freeze any time the air temperature is below 28☏ (-2☌) - for an extended period. I have a full closed 7.4L cooling system. visual mechanical inspection of running gear engine and boat as well as check onboard.
#Winterize inboard boat motor mercruiser how to#
Re: How to winterize closed cooling system engine For inboard and sterndrive engines: Flush the engine with clean water by using water muffs or a similar device to connect a garden hose to your cooling system.
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