Engine Air Intake For Turbocharged Engines

TM 5-3835-222-BD

4-7. Engine Air Intake For Turbocharged Engines. Turbocharged engines use exhaust gases to

drive the turbocharger to compress air and force it into the cylinder under pressure. The engine air

intake system is therefore vacuum and pressure. Assessment and repairs to turbocharged air system

should therefore be based on the rules above for the system up to the turbocharger inlet. For the

outlet, the repairs should seal so that the air pressure does not escape. Because the turbocharger

is driven by exhaust gases, repair of the drive system must seal the exhaust gases to prevent

depressurization.

4-8. Engine Air Intake For Supercharged or Tubosupercharged 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 that

turbocharged engines require 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.

4-9. Blower Drive Shaft Broken. The blower provides pressurized air to the engine air box. The

blower is driven by a drive shaft (quillshaft) 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:

Blower may be damaged.

Personnel/Time Required:

1 soldier - 1.0 hr.

Materials/Tools:

Welding Equipment

Deleted.

Procedural Steps:

a. Gain access to the drive shaft and remove both broken ends.

b. Use heavy steel tubing, or machine a sleeve so that the proper length is maintained.

c. Install sleeve or tube on shaft. Ensure that the proper length is maintained.

d. Weld ends of sleeve to shaft.

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