Tips for inspecting exhaust manifolds and risers

  • 07, 12, 2017
  •  Family 

    Iron castings as exhaust risers and manifolds have the tendency to corrode as they contract and cool. Many times happened a boat that runs effectively to be put in its slip, one day because the castings were damaged by the corrosion overnight. It is important if you owe a boat to keep a wary eye on the risers and manifolds, because in this way you will prevent the premature death of its engine. You do not want to find yourself one day in the situation of not being able to go on a cruise, because the engine is slow to start. Or you may notice that when the engine starts, it creates a noise that you have not heard until now. So, this is a sign that you should consider replacing your faulty manifold, because you do not want to find yourself on the sea, and your boat to not start. Here are some tips that will help you prevent a catastrophe.

    Keep the gas and water separated

    In case you do not know, the risers and the manifold are large metal castings found on your boat that carry the gasses on the inboard engines from the engine block. Depending on the type of boat you have, it may have a separate exhaust manifold. In case you have a V-8 engine than the riser can slope down from the end of the manifold when the engine is placed high above the waterline. Because there will not be a cooling effect of the water the risers and manifold will overheat and the gas will burn throughout the hose. This is why it is important to keep the exhaust gases and the cooling water separately until they exit the riser. Water cannot be compressed by the cylinders and it will lead to a massive damage to the engine. Risers and manifolds live in a severe environment and this is why they fail.

    What to look for?

    You can inspect the boat parts by yourself, because the risers for example are not so difficult to remove. You can take them off and check if the water passages are blogged or open. In case you notice that there are large chunks that flake off when you dig around the passages and you cannot remove the corroded metal, then you should consider replacing them. It is important to not be any sign or rust inside the gas-only chamber, because if it is present there, it is a sign that water is leaking inside. You should also inspect the joints where the metal faces, of the risers and the manifold, come together, because their walls are thin and the gaskets have the tendency to deteriorate. In case you notice that the metal face is pitted on the riser or manifold, then you should consider replacing it, because it can lead to leaks in time. If you want to replace the risers then you will have to talk with a professional to see if you also have to replace the manifolds, because they are difficult to remove, and you may not have the needed experience.


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