![]() ![]() ![]() New gaskets will be required whether new risers and manifolds are used, or if the old ones are reinstalled. If they are still in good condition, they can be cleaned up and put back on the engine. Since most of these leaks and breakdown form inside of the manifolds, it is recommended the manifolds and risers be taken off of the engine and inspected for the failures we have covered. On top of that, any moisture inside of the engines internals can cause rust which will cause premature wear on the system. If enough water gets into your boats cylinders, the internals can be damaged as it tries to compress the water. If left untreated, this leak could become larger and eventually leak into the boats cylinders which can be detrimental to your engine. If water leaks into the exhaust chamber, it will initially be blown out the exhaust exit of the boat in the form of vapor. Not only can holes cause improper water flow, corrosion and scaling can cause clogs within these water passages restricting the flow of water through the system. It goes without saying that if your engine is operating at temperatures higher than intended, this could cause damage to it. Water leaking on the outside of the manifold or riser, typically starting at a mating surface where there is a gasket. ![]() Water leaking into the exhaust chamber and eventually into the engines cylinder area.Engine temperatures reaching higher than typical running temperatures (usually while running the boat at higher than idle RPMs).Depending on where a hole is formed within these components, a few different things can happen: As the walls become thinner, there is a chance they can form holes. After years of use, the walls of these manifolds will eventually break down. Being made out of iron, they are very susceptible to rusting and corroding. Over the years, the manifolds and risers tend to break down, clog, and even produce holes if left long enough. Why Do the Manifolds and Risers Need to be Inspected? These components are made out of iron which is durable and can withstand the hot temperatures, but are also susceptible to rusting and rotting out. Due to heat, the manifolds and risers are built with water passages that circulate water to help cool these components as well as the exhaust gases themselves. The exhaust gases coming out of your boats engine are very hot. The exhaust manifolds and risers on your boats engine guide the exhaust gases out of your engine block to the exterior of the boat. ![]()
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