F02 Air Induction and Exhaust Slides
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Transcript of F02 Air Induction and Exhaust Slides
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DIAGNOSTICS OF AIRINDUCTION AND EXHAUST
SYSTEMS ON FMTV AND
HET
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AIR INDUCTIONSYTEM
Provides a path for and directairflow into the engine cylinder
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Naturally Aspirated uses only
atmospheric pressure and vacuumto draw air into the engine cylinder
Forced air uses air pumps toforce air into the cylinders.
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CHECK LEARNING
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Components of an Air
Induction System
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Air FiltersFilters dirt and debris
from the intake air.
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TypesDry Type - oil-soaked copper
mesh or pleated paper.Both M1070 and M1078 have
dry type.
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Intercooler Radiator like devise
Located in the intake manifold Used to cool the intake air
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Turbo Charge
Exhaust driven compressor that forces
air into the engine
Turbo housing consists of two
chambers, turbine and
impeller/compressor.
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Superchargers
Engine Driven air pump thatforces air into the engine
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Types of Superchargers
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Centrifugal Has impeller with curved vanes
Air is drawn into center andthrown outward and then out of
the housing
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Vane Works the same as a vane
oil pump Usually belt driven by the
engine
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Rootes Commonly used on diesel
engines Consists of two rotors inside
a housing
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Intake Manifold Delivers air in equal quantities to the engine
cylinders
Lengths of the passages should be near toequal distribution of the air
Passages should have smooth walls and
minimum bends to ensure a smooth flow
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M1078
Light Medium Tactical Vehicle
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Four Stroke Engine
(How the air enters the cylinders)
Air is drawn through the filter
Air passes through the intake filter
When the intake valve opens the
vacuum in the cylinder draws the air in
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FMTV AO Engine 3116 ATAAC
Caterpillar diesel 6 cylinder 225 hp
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M1070
HEAVY EQUIPMENT TRANSPORTER
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Two-Stroke Diesel Engine
Intake air enters the cylinder through
inlet ports instead of valves
A blower or a forced air system isrequired to force enough air into the
cylinder
Blower
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M1070 Air System -
1. Air Cleaner dry tank.
2. Turbocharger produces compressedair for engine .
3. Engine blower cools compressed air from
turbocharger before entering combustion
chamber.
4. After cooler.
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HET M1070 Engine
Detroit Diesel 8 cylinder turbo charged
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Exhaust System
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Purpose of the Exhaust SystemTo remove waste products of
combustion gases from the engine
and carry it from the vehicle into the
atmosphere, without danger to the
vehicles occupants
Serves to dampen engine noise
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Components of theExhaust System
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Exhaust ManifoldConnects all engine cylinders to
exhaust system
Normally made of cast iron
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Exhaust Manifold Conti-Creates a scavenging action that will cause
all cylinders to help each other get rid of
exhaust gasesBack pressure can be reduced by making the
manifold with smooth walls and without sharp
bends
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Exhaust Manifold/Pipe M1070
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Exhaust Manifold FMTV
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Muffler and PipesMuffler reduces the acoustic pressure(absorbing sound) of exhaust gases to
discharge them to atmosphere with
minimum noise
Muffler is usually located midway in the
vehicle, with the exhaust pipe between
it and the exhaust manifold and tailpipe.
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Muffler M1070
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Exhaust M1070
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Muffler/Exhaust M1078
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Check Learning
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What are two types of AirInduction Systems?
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Naturally Aspiratedand Forced Air
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What drives aTurbocharger?
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Exhaust gases
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What component in the airinduction system delivers
air to the cylinders in equal
quantities?
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The intake manifold
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What is the main physicaldifference between a two
stroke and a four-stroke
engine?
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A two-stroke has inletports and a four-stroke has
intake valves.
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What are the two types ofair filters?
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Wet and Dry
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What is the purpose ofthe exhaust system?
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To remove waste products
of combustion exhaust
gases, and dampen engine
noise.
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Next Class
Diagnose Cooling System