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Exhaust gases mixed with salt water produce a highly corrosive compound. This is why exhaust systems are typically created employing non-co...
Marine exhausts systems are an essential and often overlooked component of a marine engine. Most vessels have a wet exhaust system. 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 until it exits the boat, preferably at the stern.
Exhaust gases mixed with salt water develop a extremely corrosive compound. This is why exhaust systems are typically created employing non-corrosive components such as nitrile rubber reinforced hose (brown not green stripe), galvanized steel, fiberglass or plastic. The purpose of these elements, which differ in size and shape based on the engine size and layout of the engine room, is to stop hydraulicing of the engine. This is brought on when an engine has filled with salt water which has entered through the exhaust and can result in substantial 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 operating. Poorly designed exhausts enable water to flow back and fill the waterlock/muffler box then up the hose into the exhaust manifold, by means of the exhaust valves and into the combustion chamber. With the engine total of water the engine can not crank more than as it is can't compress water.
You will know your engine is hydrauliced if it will not turn more than normally after a lengthy sailing period and you have removed the starter motor and ensured it operates. To eliminate water from inside the combustion chambers, initial eliminate all injectors, crank engine more than to blow water out, refit injectors, bleed injector lines, and begin. Then leave motor operating until exhaust sorted out.
Check to see that the riser is not coked up or corroded a typical problem. To check the exhaust riser get rid of the exhaust hose from the riser (usually a hard process) and appear up the pipe to see if it is restricted by exhaust/salt construct up. If build up is excessive the riser will have to be removed to check the engine finish of the pipe. Coke can be scraped out to give a brief phrase repair though typically the riser will have to be replaced. There are aftermarket systems which differ in quality. Make sure you fit the appropriate design for the application.
Guarantee your water-lock is low adequate and massive enough to hold all the water in exhaust system. 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 result in sea sickness and headaches. Replace any faulty parts immediately. Use double hose clamps on every joint or, preferably, super clamps, bolt style, and exhaust cement if need to have be. Hot sections must be lagged with fiberglass tape to avoid burns.
Beware of asbestos lagging. Numerous older vessels and marine engine installations had exhaust systems that had been lagged with asbestos tape and rope. Asbestos sound-proofing was also prevalent in older boats. compare head lights
