December 6, 2021
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What are the Different Parts of Marine Engines and Their Functions?

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marine engine parts

A marine engine consists of numerous parts, and each piece performs a different function. Adding new components to the marine engine modifies its design, but the process of each part remains the same.

Each part of the marine engine has a definite function and location. Some of the components might be common, and there are chances that you might know about them. Moreover, a marine engine might consist of parts you have already reassembled in a definite order.

People who already know about different marine parts will brush up on their concepts by reading this article. However, the people who are not aware of the marine engine parts will get some vital insight about the marine engine.

Following are a few Marine Engine Parts that you might want to know.

Bedplate of Machine Engine

Bedplate is the part of the machine engine made of two parallel girders. Their parallel beams run across the length of the engine. Moreover, their girders have a connection with another set of girders known as Transverse Girders. You will find their Transverse Girders on either side of the thrust collar in between the crank throws. These girders have cast steel embedded on them for bearing support.

Manufacturers give proper consideration in designing and constructing the transverse girders so that they can maintain appropriate stiffness. Generally, during bedplate construction, the manufacturers complete it by welding cast transverse steel girders between the fabricated longitudinal girders; however, manufacturers develop them like a simple cast of iron in small engines.

Function of Bedplate

Bedplate works as a foundation for a two-stroke marine engine. This part of the marine engine is strong and flexible so that it can easily support the weight of other parts and handle fluctuating forces produced by the engine.

Camshaft of Marine Engine

The camshaft is the part of the diesel marine engine that contains a set of cams. The shaft gets support from the white metal line bearing through the cams fitted set made of steel. The camshaft has a bunch of lubrication to avoid contamination of fuel due to leakage.

A two-stroke diesel engine consists of lesser cams on the camshaft as compared to the four-stroke engine. The reason is that in a two-stroke engine, no inlet valve requires cam movement for scavenging. A crankshaft drives the camshaft to ensure the correct time of exhaust and fuel injection.

The function of Marine Engine Camshaft

The camshaft is a control device that operates the three main valves. This part operates the valves with the help of a cam follower, pushrod, and rocker arm. Every cam profile in the camshaft produces the desired speed and lifts the follower at an appropriate time.

Frame Box of Marine Engine

The frame box of a marine engine, also known as a frame, is a separately fabricated structure mounted on the bedplate. Frame box carries crosshead guides and supports the cylinder block. Furthermore, manufacturers use bolts to screw them to the bedplate.

The function of the Frame Box

The frame box is a part of the marine engine that supports the cylinder block or entablature from the bedplate.

The piston of the Marine Engine

The piston is a composite structure having a crown and a skirt. Moreover, it makes the moving parts of the combustion chamber. Piston transfers the force to the piston rod or the connecting rod, and it is subjected to mechanical stresses and fluctuating thermal. The piston’s force transfers to one of the rods depending on the engine type, as the engine can be two-stroke or four-stroke. Piston crowns have a concave structure, and it is the reason it provides maximum combustion efficiency.

Manufacturers use chromium steel in the construction of pistons to avoid the burning of the crown. The piston consists of four or five chromium-plated grooves that accompany the piston rings. Moreover, the skirt on the piston is like a guide for the piston to move along the cylinder liner.

Function of Piston

A piston in a marine engine functions to convert the force of gas during combustion into mechanical energy. During the compression stroke, the piston compresses the gas present between the crown and cylinder through the energy that it receives from the flywheel. The piston is like the engine’s head and can transform the energy under mechanical stress and fluctuating thermal.

Piston Rings of Marine Engine

Piston ring contains general characteristics like strength, resistance to corrosion, ability to transfer heat, and elasticity. Manufacturers use alloy cast iron to make the piston rings. Moreover, they add molybdenum, chromium, nickel, titanium, and sometimes copper during the construction of piston rings.

The function of Piston Rings

Piston rings act as sealing for the combustion chamber as they expand outwards. Moreover, it prevents the combustion gases from leaking or escaping between the piston crown and the cylinder head. Another benefit of the piston ring is that it allows the proper transfer of heat between the piston and Liner.

The Liner of the Marine Engine

Liner is like a thin metal cylinder placed on the top of the cylinder block. Manufacturers screw it at the top of the cylinder head. The Liner is a marine engine that helps the cylinder liner expand during the heating process.

Manufacturers construct the line with high-quality alloy cast iron to withstand the pressure of the cylinder and high temperature. Producers also groove certain bores inside the Liner so that the piston can transfer better heat and cooling.

During the production, the jacket of cooling water gets space between the Liner and cylinder block. After placing, everything gets sealed at the bottom with the help of O-rings.

The function of the Liner

A cylinder liner in a marine engine plays a vital role as it provides a durable combustion chamber that is heat resistant. Moreover, it gives a cooling area, lubrication, and scavenging, which helps seal the combustion chamber. Another benefit of the Liner is that it helps prevent the combustion product and compressed gas from escaping the engine.

Bottom Line

A marine engine contains many other parts, but we have discussed a few in this article. If you want to know about any other part of the marine engine and its works, you can search online and can find out.

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