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TM 9-2320-356-BD
Section III.
ENGINE AIR INTAKE SYSTEMS
5-6.
ENGINE AIR INTAKE FOR NATURALLY ASPIRATED ENGINES
Naturally aspirated engines require a downward piston movement to create a vacuum,
drawing air into the intake system.
To avoid damage to this type of system,
prevent drawing unfiltered air into the engine.
Repairs to this system should
always be done with materials that do not block the air flow and that are securely
attached to prevent them from being sucked into the engine through the intake
manifold.
5-7.
ENGINE AIR INTAKE FOR TURBOCHARGED ENGINES
Turbocharged engines use exhaust gases to drive the turbocharger, compressing the
air and forcing it into the cylinder;
therefore, the engine air intake system is
vacuum and pressure.
Assessment and repairs to turbocharged air systems, should,
therefore, be based on the rules above for the system up to the turbocharger
i n l e t .
Repairs should seal the outlet so that the air pressure does not escape.
Because the turbocharger is driven by exhaust gases, repair to the drive system
must seal the exhaust gases to prevent depressurization.
5-8.
ENGINE AIR INTAKE FOR SUPERCHARGED OR TURBOSUPERCHARGED ENGINES
Supercharged engines use a mechanical system to drive the air intake compressor.
The supercharger is usually mounted directly on the intake manifold or engine
block.
Some Detroit Diesel models are turbosupercharged. Damage assessment and
repair to these engines require the same techniques and precautions as turbocharged
engines for the vacuum and pressurized parts of the air intake system.
Because
superchargers are mechanically driven, repairs to the drive system will usually
require repair parts.
5-9.
BLOWER DRIVE SHAFT BROKEN
General Information:
The blower provides pressurized air to the engine air box. The blower is driven by
a drive shaft (quill shaft) which acts as the fuse for the supercharger system.
The
shaft shears when it is overloaded to protect the blower from damage.
The shaft
can be repaired if a new part is not available.
Limitations:
o Blower may be damaged
Personnel/Time Required:
Materials/Tools:
o 1 soldier
o 1 hour
o Tubing or sleeve
o Welding equipment
o Shop van/lathe
5-1o
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