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marine engines, diesel engine,
exhaust trunk, starting air valve, cylinder head, cylinder liner, turbocharger,
scavenging manifold, exhaust port, piston, piston ring, piston cooling
telescopic tube, piston rod, fuel pump, piston rod gland, cam shaft, reversing
servomotor, crosshead, fuel valve, injector, connecting rod, bearing,
crankshaft, journal, crankpin, crankcase relief valve, tie rod, bedplate, air
cooler, cylinder lubricator,
scavenging port, a-frame
Parts of the marine diesel engine
Below is a cross-sectional view of a Sulzer Main Diesel
Engine and the names of the component parts.
The starting air valve is used to lead highly
compressed air to push the piston for turning the engine
when starting. In this 2-stroke engine, the air intake and
exhaust are taken into the engine cylinder liner through
scavenging ports and exhaust ports.
The cylinder head covers the top of the cylinder and
houses the starting air valve, fuel valve or injector. It
will also contain a relief valve and indicator cock.
The piston contains piston rings that will seal the
high pressure combustion gases from the bottom part of the
engine. The piston is cooled by water that is led through
telescopic tubes into the hollow piston assembly.
The cylinder liner is surrounded by cooling jacket
water. This can be removed and changed. The seals between
the cylinder liner and the engine block is by silicone
o-rings that can stand the high temperatures.
Underneath the piston is a space that is used for air
intake. The scavenging air makes use of the movement of
the piston to pump the air into the cylinder liner during
air intake stroke. A turbocharger is installed to compress
the air slightly for better efficiency. It makes use of
the energy of the exhaust gas to drive the turbine blades
and eventually the blower.
The piston rod moves vertically and is sealed at the
piston rod gland. This prevents the air from escaping into
the crankcase. The crosshead converts the vertical
movement of the piston into rotary motion at the
connecting rod-crankshaft. The lubrication of the
crosshead is through articulating pipes. The lubrication
of the journal bearings and crankpin bearings is through
the lubricating oil system.
The tie rods secure the whole engine block together.
There is also crankcase relief valve for reducing the
damage if there is a
crankcase explosion.
The bedplate contains the main bearings for the
crankshaft and the thrust bearings. The whole engine rests
on the bedplate that is secured to the ship structure.
Also see Main
Diesel Engine Cooling System. Find out more about the
Pistons and Rings used on board ship. |
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