Marine Exhaust Systems – How They Work
Exhaust gases mixed with salt water create an extremely corrosive compound. This is why exhaust systems are frequently created making use of non-co…
Marine exhausts systems are an essential and typically overlooked component of a marine engine. Most vessels have a wet exhaust program. 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 by way of a series of bends till it exits the boat, preferably at the stern.
Exhaust gases mixed with salt water generate a very corrosive compound. This is why exhaust systems are typically made employing 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 depending on the engine size and layout of the engine room, is to stop hydraulicing of the engine. This is induced when an engine has filled with salt water which has entered through the exhaust and can result in extensive damage if left for a lot more than two hours. Water enters the exhaust from wave action at stern and poor exhaust style. In some ocean conditions, such as a following sea, water can be forced back up the exhaust when the engine is not running. Poorly created 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 cannot crank more than as it is can not compress water.
You will know your engine is hydrauliced if it will not turn over typically right after a lengthy sailing period and you have removed the starter motor and ensured it works. To remove water from inside the combustion chambers, first remove all injectors, crank engine over to blow water out, refit injectors, bleed injector lines, and start off. Then leave motor operating till exhaust sorted out.
Check to see that the riser is not coked up or corroded a frequent dilemma. To check the exhaust riser get rid of the exhaust hose from the riser (often a difficult procedure) and look up the pipe to see if it is restricted by exhaust/salt develop up. If create up is excessive the riser will have to be removed to check the engine finish of the pipe. Coke can be scraped out to offer a short term fix although frequently the riser will have to be replaced. There are aftermarket systems which vary in quality. Make certain you fit the proper style for the application.
Ensure your water-lock is low enough and huge enough to hold all the water in exhaust program. 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 effectively no leaking valves?
Exhaust gas is poisonous and can cause sea sickness and headaches. Replace any faulty parts quickly. Use double hose clamps on each joint or, preferably, super clamps, bolt style, and exhaust cement if need to have be. Hot sections really should be lagged with fiberglass tape to stop burns.
Beware of asbestos lagging. Several older vessels and marine engine installations had exhaust systems that were lagged with asbestos tape and rope. Asbestos sound-proofing was also common in older boats.
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