Re: Cooling systems how do they work
There are 2 different systems:<br />1. "Raw water cooled". This uses the water that your boat is floating on. A [raw water]pump sucks it up and sends it to the engine's water pump, which then circulates it through the engine to cool it, then to the exhaust manifolds and out.<br />2. "Fresh water cooled". The raw water pump sucks up the outside water and sends it through a heat exchanger [radiator], then to the exhausts. The actual coolant in the engine is circulated by the engine water pump through the heat exchanger, where it gives up it's heat to the raw water side, then the coolant is recirculated through the engine again. Think of the heat exchanger like you would the radiator in a car, except instead of air blowing through it to remove the engine heat, lake [or river or ocean] water does the job.<br /><br />You can use anti-freeze in a fresh water system, but not in a raw water setup.<br />The drive unit doesn't need a cooling system, as it doesn't produce lot of heat, and is sitting in the water anyway.
