Diesel engines

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A slow speed or medium speed Diesel engine
is a high pressure propulsion plant
with internal combustion.

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In a V-engine the cylinders are placed in an oblique (or bevel)
position, unlike the in-line engine, where the cylinders are
placed “in line”.
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V-engine
In-line
engine

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cylinder
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The cylinder is filled with air.
During the compression stroke
the air in the cylinder is
compressed.

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The atomizer
1
The atomizer (1) sprays the fuel
into the cylinder.
The nozzle divides the fuel into
small particles.
atomizer
Tip of the atomizer
(nozzle).

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The power stroke
1
During the power stroke the fuel is
injected and burnt.
This actuates the piston(1)
and
connecting rod (2).
2

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The piston
Piston
The piston makes a
reciprocating motion.

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The crosshead
The crosshead (1) serves as a
hinging connection between
piston rod (2) and
connecting rod (3).
2
1
3
Crosshead guides and
crosshead guide shoes (4)
absorb the forces onto
the crosshead when the piston
goes down.
4

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The crank (1)is connected
to the crankshaft (2).
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2
1

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The crankshaft
The crank changes the
reciprocating motion of the
piston into a rotary motion
of the crankshaft .
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The camshaft
Gearwheels
to drive the camshaft
are driven by chains
(“chaindrive”).
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camshaft

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The camshaft
The campeak is fixed to the
camshaft.
campeak
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campeak

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3
The pushrod
The push rod (1)
may be used as a distance piece
between campeak (2)
and rocker arm (3).
1
2
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2
The exhaust valve
1
The exhaust valve (1)
is actuated (opened) by the
rocking lever (2) (rocker arm).
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1
The exhaust valve
The exhaust valve
is actuated (closed)
by the exhaust valve spring (1).
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The scavenging system
2
1
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The scavenging air manifold (1)
and scavenging ports (2)
supply the scavenging air
to remove the exhaust gases.

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SCAVENGING SYSTEMS
CROSS
SCAVENGING
LOOP
SCAVENGING
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UNIFLOW
SCAVENGING

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Cooling the cylinder:
1
2
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The cylinder liner (1)
and cylinder jacket (2)
form the cylinder wall.

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Cooling the cylinder:
A coolant (fresh water)
is injected between
liner and jacket
to cool the cylinder.
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Cooling the piston:
The piston is cooled by oil.
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The advantages of oil as
a coolant are:
. it reduces noise;
. it purifies;
. it forms a seal;
. it lubricates;
. it is anti-corrosive;
. it has a higher resistance
to heat.

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Piston rings
1
The piston rings (1)
form a seal around the cylinder
and carry away the heat.
SO
Piston rings

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During the air induction
stroke
(or inlet stroke,
or suction stroke)
air is drawn into the cylinder.
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During the
compression stroke
the air in the cylinder
is compressed.
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During the power stroke
fuel is injected
and burnt.
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During the exhaust stroke
the exhaust gases are
driven out of the cylinder by
the piston.
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The
International Maritime Language Programme – IMLP
C
The IMLP is an IMO-standard.
P.C. van Kluijven