Oil coolers with a fresh water cooling system use the water from a lake, river or ocean to lower the temperature of the engine’s coolant. A type of heat exchanger, this product keeps the engine or transmission oil cool while the vessel is in motion.

Mercruiser - Direct Replacement Heat Exchangers & Oil Coolers

Heat exchangers and oil coolers manufactured by Seakamp Engineering are a popular choice for boaters, and can be used for most fluid to fluid cooling applications. Seakamp’s Mercruiser direct replacement heat exchanger allows for freshwater engine cooling as well as the use of a hot water cabin heater when navigating in cooler climates.

In addition, Mercruiser heat exchangers and oil coolers prevent electrolysis by using dual zinc anodes, as well as corrosion resistant metals in their construction. With electrolytic reaction, the zinc will actually corrode and wear away, while preserving the copper and copper / nickel alloy metals that make up in the heat exchanger, oil cooler and engine system.

Heat exchangers and oil coolers are easy to install and can dramatically extend the life of a boat’s engine by protecting the entire motor system from rust and corrosion. Seakamp Engineering products can be customized to the exact requirements, size and fittings of most vessels.

Seakamp Oil Coolers

Oil coolers are a type of heat exchanger which is a mechanism in a marine vessel that uses water from the lake, river or ocean to decrease the temperature of the engine’s coolant in a fresh water cooling system. Many boat owners use a mixture of distilled water and antifreeze that flows through the boat’s heat exchanger and transfers its heat to cycling raw water that is returned to the body of water in which the boat floats much like the radiator fluid in a car transfers the heat to the flowing air.

In addition, boats use oil coolers to keep the engine or transmission oil cool while on the water. Seakamp Engineering oil coolers can be used as a heat exchanger for most fluid to fluid applications. The exchanger contains all seamless tubing and can withstand pressures in excess of 800 pounds per square inch for custom high pressure applications.

Oil coolers are typically made of copper or a copper-nickel alloy called cupronickel. The alloy is resistant to corrosion in seawater, as the electrical potential force of the material is adjusted to be neutral with salt water.

Zinc anodes prevent electrolysis through the sacrificial action of zinc which does this by standing in place of the more reactive metals that comprise many boat engines. The zinc itself corrodes away rather than the metals in the heat exchanger, oil cooler or engine system itself.

Heat exchangers and oil coolers built by Seakamp Engineering can be customized to match the engine, environmental conditions, cooling requirements as well as the size and fittings of nearly any boat.

Go2marine is proud to offer Seakamp Heat Exchangers and Oil Coolers. Seakamp Engineering offers the following features:

  • Made in the USA
  • Built from quality materials by professionals
  • Custom orders can often be completed in 2 business days
  • Affordable replacement for OEM
  • 1 year warranty on materials and workmanship


Exposed Heat Exchanger

Exposed Heat Exchanger

Heat Exchanger Materials

Heat exchangers are typically constructed of copper cooling tubes or of a copper nickel alloy called cupro-nickle. The copper nickel alloy is most commonly done in a 90/10 ratio although 70/30 is available in limited applications. Heat exchangers built from 90/10 cupro-nickle tubes offer increased resistance to salt water corrosion and biofouling. Cupro-nickel does not corrode in seawater, because its electrode potential is adjusted to be neutral with regard to seawater. 

What is a Heat Exchanger?

A heat exchanger is simply a device built for efficient heat transfer from one type of medium to another. Heat exchangers can be used to cool or to heat other devices.  Examples of this abound in our personal life as air conditioning, refrigeration, heat pumps, heaters, radiators and other heat exchanger systems. The radiator in an automobile is a heat exchanger that transfers heat from the coolant which first flows through the engine block, gathering heat. The coolant then flows from the engine to the radiator where air flowing through the radiator fins removes some of the heat. The passenger heater in a car is also a heat exchanger.

Boats rarely have automotive style radiators because clean, steady air flow is too hard to attain. Instead of air moving across a heat exchanger, marine engines use the water the boat sits in to cool the hot engine fluids and exhaust gasses. In marine use, there are two primary ways to cool an inboard or I/O engine. These engines may be cooled with outside water running through the block and exhaust, this is a raw or sea water system. A sealed system of coolant cycled through the block and then into a heat exchanger which is cooled by external water is called a fresh water cooling system. You can also cool any type of oil – motor, hydraulic, power steering, transmission – with an oil cooler.

Fresh Water Cooling Systems

Conversion to a fresh water cooling system is typically done for boats being used in salt water. A Fresh Water Cooling System is a heat exchanger with all the parts to convert a raw water system to a closed loop cooling system. Beyond the heat exchanger, there is some plumbing and parts needed to install the system, including; belt driven raw water pump, heat exchanger mounts, gaskets, thermostat, thermostat housing, hoses, hose clamps, hose fittings, & fasteners. The biggest advantage of a fresh water cooling system is an increased life of all engine parts that were once in contact with the raw sea water. With fresh water cooling, there is reduced galvanic action to the engine cooling system.

Custom Built Heat Exchangers

Custom heat exchangers from Seakamp are available for varied vessel applications. Heat exchangers can be built to match:

  • The vessels engine displacement and horsepower
  • Hose connections to match the Inlet and Outlet for the engine
  • Hose connections to match the Inlet and Outlet for the Raw (Sea) Water
  • Outside Diameter of heat exchanger
  • Orientation and installation – vertical or horizontal
  • Flow rates and system pressure
  • Typical raw water operating temperature