massive power to propel a heavy loaded ship. There are different parts of the

marine engine which helps the engine to rotate the crankshaft and propel the

ship from one port to another. Each component plays an important role in

powering and running a marine diesel engine but the engine cannot run unless

all components are in place and are in working condition. The main engine of a

seagoing cargo ships are usually two-stroke internal combustion engines .

The working of the two-stroke engine can be understood from this video for a

marine engineer or a professional working on ships it is vital to know

different engine parts and their function to operate and troubleshoot

when needed. You must have seen the engine inside the machinery room of the

ship covered and assembled with different other auxiliaries. Let's take

it out from its installation and only concentrate on the main engine to

understand its different parts, but before proceeding further please do

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video. Looking at the exterior of the engine it comprises of the following Bed

plate- bed plate is the foundation block for two-stroke engine. It is built to

withstand the constant force from the engine but is also flexible enough to

handle constant fluctuations. A frame it is a fabricated steel structural element

of a slow-speed two-stroke diesel engine it stands on

the bedplate above the main bearings the a-frame carries the crosshead guides

and support the engine entablature also known as the cylinder block and

Entablature an entablature is a part of ships main

engine which houses the cylinder liner along with this scavenger space and

cooling water spaces. Turbocharger - Turbochargers are heat recovery

equipment helping to enhance the efficiency of the engine by supplying

fresh air they are located near the cylinder block check this video to

understand the turbocharger operation. Charge air cooler - charge air cooler is a

cooling arrangement for air supplied from the turbocharger before sending it

to the combustion chamber. It is usually located below the turbocharger and

adjacent to the scavenge space. Scavenge trunk - scavenge trunk is a space where

the cooled air from the charge air cooler is supplied for efficient

combustion. Cylinder head - It acts as a lid of the combustion chamber and

supports the exhaust wall and fuel injectors necessary for operation

Exhaust Vall - The exhaust wall helps to draw out the exhaust gases post the

combustion process. Know more about the functioning of marine engine exhaust

valve in this video. Exhaust trunk the exhaust drawn out of the exhaust wall is

then transferred to the exhaust trunk from where it strikes the turbine blades

of the turbocharger for heat recovery. It is located in between the cylinder head

and turbocharger unit. So these are the basic components which can be seen from

outside of the engine. Now let's dive inside the engine to understand

different rotating and moving parts that are involved in the propulsion process

that is the movement of the propeller. Liner it provides a durable and heat-resistant

combustion chamber preventing combustion products from escaping into the engine

itself. It is located at the top side of the entablature. Piston -- piston is used to

convert the force of expanding gasses into mechanical energy during the

process of combustion. It moves inside the liner and is connected to the cross

head by piston rod. Piston rings - it seal the piston therefore sealing the

combustion chamber preventing gases from leaking into the piston and surrounding

areas. Piston Rod -- it carries the piston and connects it to the crosshead

where the motion transfer takes place

Stuffing box - the crankcase is separated from the cylinder and scavenge space by a

diaphragm plate on a two stroke crosshead engine. The piston rod passes through a

stuffing box which is bolted into this diaphragm plate. The stuffing box

contains a series of scraper rings and sealing rings to seal and separate these

two spaces. Crosshead --A reciprocating block which usually slides in guides and

is the connecting point for piston rod and the connecting rod in a low-speed

two-stroke diesel engine. Connecting rod - The connecting rod is fitted between the

crosshead and the crankshaft. It transmits the firing force and together

with the crankshaft convert the reciprocating motion to a rotary

motion. Crankshaft -- It is the main component behind

transmitting power to the propeller shaft. The crankshaft on the large

modern two-stroke marine diesel engine can weigh over 300 tonnes they are too

big to make as a single unit and so are constructed by joining together

individual forging. Camshaft - The camshaft carries the cams which operates the fuel

pumps and exhaust valves. Because this operate once every cycle of the engine,

the camshaft on a two-stroke engine rotates at the same speed as the

crankshaft. Gear drive - Camshafts are driven either by gears or chains. In the

case of gear drive a train of gear wheel is fitted which transmits the drive from

the crankshaft to the camshaft.

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