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What is fresh water cooling?
It is the marine version of the cooling system that you have in your car. Most marine engines start out as a non-marine engine and were designed to have a clean non-corrosive antifreeze coolant circulating between the engine and a "radiator". In the marine version of this cooling system, "fresh water cooling", water instead of air; passes through the heat exchanger/radiator and absorbs the heat from the engine. Many marine engines, for cost reasons, utilize the initially less expensive, raw water cooling system. In this case, polluted corrosive seawater, pumped directly into the engine, eats at the very base of a marine engine causing irreparable damage. >Back to Top
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Longer engine life due to:
No corrosion - Most marine engines "rust out" rather than "wear out". By replacing corrosive raw water with antifreeze solution, you will prevent corrosion damage.
No scale - Complete elimination of scale build up inside the water passages of the engine. The salts that exist in seawater, as well as "hard" fresh water create scale that will restrict proper coolant flow and heat transfer.
Proper engine temperature - For best engine life and performance your car engine operates at a temperature much higher than raw water cooled marine engine. By converting to FWC you can bring the engine temperature up to proper level using a higher temperature thermostat. This, in turn, will give you improved fuel economy, less engine wear, no crankcase condensation, no oil dilution and no sludge.
Simplified winterizing - By keeping an antifreeze solution in your engine all year round, winterizing is simplified.
Easy galley water and cabin heat - Galley water heaters and cabin heaters utilizing excess engine heat are easily added to the system.
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Block and manifold, full system. In these systems not only the engine block, but the exhaust manifolds as well, are included in the antifreeze system. The exhaust elbows, where the raw water enters the exhaust system, always remain on the raw water side. Full systems may not be possible on all engines due to lack of proper water connections on the exhaust manifolds. This is often a problem with sterndrive engines. These problems can sometimes be solved but it will get expensive. Typically, full systems are more expensive in terms of hardware and, especially, installation.
Block only, half system.
In "block only" systems, the most expensive part of the system, the engine block itself is on the antifreeze system. Exhaust manifolds remain on the raw water side. Half systems are less expensive to buy and much easier to install. When replacement exhaust manifolds are available at reasonable cost, this half system is often the most cost effective. Carefully make an overall cost comparison between full and half systems before making a decision. >Back to Top
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Should I have FWC if I keep my boat in fresh water?
Yes, to simplify winterizing, eliminate all corrosion and debris damage. Although lake and river water is not as harmful as seawater, it often contains scale forming salts, pollutants, mud, sand and other marine organisms, which often can be quite damaging. >Back to Top
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How long will my raw water cooled engine last?
Impossible to say. Water conditions and, therefore, corrosion rates vary from one location to the next. The main problem is that since the damage is internal and completely hidden, there is no accurate way to measure the damage and predict when the engine is going to fail. >Back to Top
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How long will my engine last with FWC?
It will wear out in a normal fashion. Most marine engines "rust out" rather than "wear out". With an average of no more than 50 hours annually on pleasure boats the wearing out for an engine that is FWC and well maintained should be measured in decades rather than years. >Back to Top
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I thought that FWC was primarily for larger boats?
It may have been, but should not be. Factory fresh water cooling engines are usually installedghfghdf in larger, more expensive boats. The additional cost is fairly low in proportion to the total cost of a larger boat. However, in smaller boats the engine represents a far larger proportion of the boat's total value. The owner should, therefore, be more concerned with the condition and value of his engine, or he will pay for it in the long run in the form of premature re-powering or lack of resale value. >Back to Top
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Some boat dealers tell me that FWC is not necessary.
It depends on that you mean by necessary. FWC is not necessary in the sense that your engine will stop functioning tomorrow if you don't have it. Nor is changing your oil and filter and many of the other things that you do in order that your engine will give you maximum life and performance. The benefits of fresh water cooling are more of the long-term type. In order to keep the cost of a new boat to an acceptable level, some dealers hesitate to recommend options that are not absolutely necessary when the boat is purchased. >Back to Top
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I may sell or trade my boat before I have any problems due to lack of FWC, why should I convert?
The trade-in value of a boat with FWC is much higher. A FWC system on your marine engine is the best way to defuse the time bomb that a raw water cooled engine represents to a potential buyer. A marine engine is not like the tires on a car, where it is possible to judge how much life is left. Corrosion damage is completely hidden and impossible to measure. A FWC system shows there are no unpleasant surprises waiting. It also shows that the previous owner was knowledgeable and probably in every other respect took good care of the engine. >Back to Top
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Will FWC affect my basic engine warranty?
There is no reason why it should. There is nothing in a Monitor Fresh Water Cooling System that can do harm to the engine as long as the system is functioning normally. Because of our high performance design our systems have a very high safety margin due to normal cooling performance.
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