Exhaust manifold for OMC boat engines
The exhaust manifold is an important component of the exhaust system of a combustion engine. Its task is to collect the exhaust gases from several cylinders and guide them into a common exhaust pipe.
In boat engines, the exhaust manifold also plays an important role in temperature control, as many systems are water-cooled. This prevents the exhaust gases from causing excessively high temperatures in the engine compartment.
Structure of an OMC exhaust manifold
An exhaust manifold usually consists of a solid housing made of cast iron or a comparable heat-resistant material. It is mounted directly on the cylinder head of the engine and connects several exhaust openings of the cylinders with the downstream exhaust system.
Typical components around the exhaust manifold are
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Exhaust manifold
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Exhaust manifold or exhaust riser
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Gaskets between cylinder head and manifold
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Connecting parts and assembly kits
In many OMC engines, the exhaust manifold is combined with an exhaust riser that guides the exhaust gases to the exhaust hose or exhaust system.
Function in the exhaust system
The exhaust manifold fulfills several important tasks in the boat engine:
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Collection of exhaust gases from several cylinders
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Forwarding the exhaust gases to the exhaust system
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Supporting cooling in the exhaust area
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Reduction of heat in the engine compartment
By combining the exhaust gases in a common component, an efficient exhaust gas flow is made possible.
Wear and maintenance
Exhaust gas collectors are exposed to high temperatures and corrosive influences during operation. Particularly in a maritime environment, salt water, moisture and temperature fluctuations can lead to material wear.
Typical problems can be
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Corrosion inside the exhaust gas collector
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Cracks in the housing
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Leaking seals
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Restricted exhaust gas flow
Regular inspection and replacement of damaged components help to prevent damage to the engine or exhaust system.
Exhaust manifolds for Johnson and Evinrude engines
The Outboard Marine Corporation (OMC) produced numerous boat engines under the Johnson and Evinrude brands. Many of these engines use similar exhaust systems and components.
Suitable exhaust manifolds enable maintenance and repair of these engines and ensure that the exhaust system continues to work reliably.
