Marine Exhaust Systems – How They Perform
Exhaust gases mixed with salt water develop a highly corrosive compound. This is why exhaust systems are generally produced utilizing non-co…
Marine exhausts systems are an crucial and frequently overlooked component of a marine engine. Most vessels have a wet exhaust technique. 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 means of a series of bends till it exits the boat, preferably at the stern.
Exhaust gases mixed with salt water develop a hugely corrosive compound. This is why exhaust systems are frequently made making use of non-corrosive components such as nitrile rubber reinforced hose (brown not green stripe), galvanized steel, fiberglass or plastic. The purpose of these components, which vary in size and shape depending on the engine size and layout of the engine space, is to stop hydraulicing of the engine. This is induced when an engine has filled with salt water which has entered via the exhaust and can cause extensive damage if left for a lot more than two hours. Water enters the exhaust from wave action at stern and poor exhaust design. In some ocean conditions, such as a following sea, water can be forced back up the exhaust when the engine is not running. Poorly developed exhausts allow water to flow back and fill the waterlock/muffler box then up the hose into the exhaust manifold, via the exhaust valves and into the combustion chamber. With the engine full 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 more than normally after an extended sailing period and you have removed the starter motor and ensured it functions. To get rid of water from inside the combustion chambers, 1st eliminate all injectors, crank engine more than 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 widespread issue. To check the exhaust riser eliminate the exhaust hose from the riser (frequently a difficult process) and appear up the pipe to see if it is restricted by exhaust/salt build 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 provide a short term fix though typically the riser will have to be replaced. There are aftermarket systems which differ in high quality. Make sure you fit the correct design for the application.
Make certain your water-lock is low sufficient and massive sufficient 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 properly no leaking valves?
Exhaust gas is poisonous and can result in sea sickness and headaches. Replace any faulty parts quickly. Use double hose clamps on every single joint or, preferably, super clamps, bolt style, and exhaust cement if need be. Hot sections 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 typical in older boats.
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