Marine Exhaust Systems – How They Function
Exhaust gases mixed with salt water create a very corrosive compound. This is why exhaust systems are frequently made employing non-co…
Marine exhausts systems are an important and typically overlooked element of a marine engine. Most vessels have a wet exhaust method. Salt water is injected at the riser the outlet for exhaust from the exhaust manifold. This mixture of exhaust gas and water is then passed through a series of bends until it exits the boat, preferably at the stern.
Exhaust gases mixed with salt water create an extremely corrosive compound. This is why exhaust systems are generally created using non-corrosive components such as nitrile rubber reinforced hose (brown not green stripe), galvanized steel, fiberglass or plastic. The objective of these components, which differ in size and shape based on the engine size and layout of the engine area, is to prevent hydraulicing of the engine. This is brought on when an engine has filled with salt water which has entered by way of the exhaust and can result in extensive harm if left for more than two hours. Water enters the exhaust from wave action at stern and poor exhaust design. In some ocean circumstances, such as a following sea, water can be forced back up the exhaust when the engine is not operating. Poorly designed exhausts permit water to flow back and fill the waterlock/muffler box then up the hose into the exhaust manifold, by way of the exhaust valves and into the combustion chamber. With the engine complete of water the engine can not crank over as it is can’t compress water.
You will know your engine is hydrauliced if it will not turn over usually right after a long sailing period and you have removed the starter motor and ensured it works. To remove water from inside the combustion chambers, very first remove all injectors, crank engine over to blow water out, refit injectors, bleed injector lines, and begin. Then leave motor running till exhaust sorted out.
Check to see that the riser is not coked up or corroded a typical dilemma. To check the exhaust riser remove the exhaust hose from the riser (typically a tough procedure) and look up the pipe to see if it is restricted by exhaust/salt create up. If construct up is excessive the riser will have to be removed to check the engine end of the pipe. Coke can be scraped out to supply a brief term fix even though usually the riser will have to be replaced. There are aftermarket systems which vary in quality. Make positive you fit the appropriate style for the application.
Make sure your water-lock is low enough and large enough to hold all the water in exhaust method. Is there a gooseneck or central vertical loop in the exhaust hose at the transom exit? Is there a siphon break and is it functioning appropriately no leaking valves?
Exhaust gas is poisonous and can trigger sea sickness and headaches. Replace any faulty parts instantly. Use double hose clamps on every joint or, preferably, super clamps, bolt style, and exhaust cement if want be. Hot sections must be lagged with fiberglass tape to prevent burns.
Beware of asbestos lagging. A lot of older vessels and marine engine installations had exhaust systems that were lagged with asbestos tape and rope. Asbestos sound-proofing was also widespread in older boats.
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