F02 Air Induction and Exhaust Slides

7/27/2019 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

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F02 Air Induction and Exhaust Slides