Understanding A Marine Exhaust System

Marine exhausts systems are an important and often overlooked component of a marine engine. Most vessels have a ‘damp’ 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 after that travelled through a series of bends till it exits the boat, ideally at the stern.

Exhaust gases mixed with salt water create a very corrosive substance. This is why exhaust systems are generally made using non-corrosive components such as nitrile rubber reinforced hose pipe (brown – not green – red stripe), galvanized steel, fiberglass or plastic. The objective of these elements, which differ in shapes and size relying on the engine dimension and also layout of the engine room, is to stop hydraulicing of the engine. This is created when an engine has loaded with seawater which has actually gone into via the exhaust as well as can trigger extensive damages if left for greater than 2 hours. Water gets in the exhaust from wave activity at demanding as well as poor exhaust layout. In some sea conditions, such as a complying with sea, water can be compelled back up the exhaust when the engine is not running. Improperly designed exhausts enable water to recede and fill up the waterlock/muffler box after that up the hose right into the exhaust manifold, through the exhaust shutoffs as well as right into the burning chamber. With the engine full of water the engine can not crank over as it is can not compress water.

You will understand your engine is hydrauliced if it will certainly not pass on – generally after a lengthy cruising duration – and you have actually eliminated the starter motor as well as guaranteed it functions. To remove water from inside the burning chambers, first get rid of all injectors, crank engine over to blow water out, refit injectors, hemorrhage injector lines, as well as start. After that leave electric motor running until exhaust sorted out.

Inspect to see that the riser is not colad up or corroded – an usual problem. To examine the exhaust riser eliminate the exhaust pipe from the riser (commonly a tough procedure) as well as seek out the pipeline to see if it is limited by exhaust/salt build up. If develop is extreme the riser will certainly need to be eliminated to inspect the engine end of the pipeline. Coke can be scratched out to offer a short-term fix although often the riser will certainly have to be replaced. There are aftermarket systems which differ in quality. Ensure you fit the ideal design for the application.

Ensure your water-lock is low sufficient and also large enough to hold all the water in exhaust system. Is there a gooseneck or main vertical loop in the exhaust pipe at the transom departure? Exists a siphon break as well as is it working correctly – no dripping shutoffs?

Exhaust gas is harmful and can create sea sickness as well as migraines. Replace any kind of defective parts immediately. Usage dual hose pipe clamps on each joint or, preferably, very clamps, screw design, as well as exhaust concrete if requirement be. Warm KP-LOK sections KP-LOK tubing valves and fittings should be delayed with fiberglass tape to stop burns.

Be careful of asbestos lagging. Many older vessels and also marine engine setups had exhaust systems that were lagged with asbestos tape and rope. Asbestos sound-proofing was additionally KP-LOK typical in older watercrafts.

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