Answer
Apr 26, 2023 - 03:18 AM
A marine exhaust system is responsible for removing the engine's exhaust gases and discharging them safely overboard. In most cases, a marine exhaust system works by directing exhaust gases from the engine through a series of pipes and components until they exit the boat through the exhaust outlet.The gases frequently go directly into the water with the cooling fluid used for the engine. The exhaust system is related to the cooling system because some components of the exhaust system are cooled by the engine's cooling system. For example, the exhaust manifold is a component that is responsible for collecting exhaust gases from each cylinder of the engine and directing them through the exhaust system. In some marine engines, the exhaust manifold is cooled by the engine's freshwater cooling system. This is known as a "freshwater cooled" exhaust system. In this case the antifreeze or coolant is recirculated through the engine. There is a blocker plate that exists between the manifold and the components above the manifold referred to as a spacer, elbow or riser. These three components will receive seawater to run through their water jackets / cooling ports and the seawater will combine with the exhaust to some degree and then exit with the exhaust gases into the surrounding water source.
In other marine engines made prior to 2015, the exhaust manifold is cooled by seawater that is drawn into the exhaust system through a raw water pump. This is known as a "raw water cooled" exhaust system. In this type of system, seawater is pushed into the manifold and then the seawater continues as described above into the manifold, spacer, elbow and or riser the seawater will combine with the exhaust to some degree and then exit with the exhaust gases into the surrounding water source.
Regardless of whether the exhaust system is freshwater or raw water cooled, it is an important component of the overall cooling system of the marine engine. Blockages in ports of the exhaust (commonly from scale due to oxidation) can easily cause damage to the engine and potentially even cause it to overheat. Therefore, it is important to maintain and inspect the exhaust system regularly to ensure that it is in good working order.
©2023 Mr. Cool Marine LLC
In other marine engines made prior to 2015, the exhaust manifold is cooled by seawater that is drawn into the exhaust system through a raw water pump. This is known as a "raw water cooled" exhaust system. In this type of system, seawater is pushed into the manifold and then the seawater continues as described above into the manifold, spacer, elbow and or riser the seawater will combine with the exhaust to some degree and then exit with the exhaust gases into the surrounding water source.
Regardless of whether the exhaust system is freshwater or raw water cooled, it is an important component of the overall cooling system of the marine engine. Blockages in ports of the exhaust (commonly from scale due to oxidation) can easily cause damage to the engine and potentially even cause it to overheat. Therefore, it is important to maintain and inspect the exhaust system regularly to ensure that it is in good working order.
©2023 Mr. Cool Marine LLC
