CHAPTER 5 IMPROVED CLEAN AIR INDUCTION SYSTEM CREW OPERATION/MAINTENANCE

TB 9-2300-378-14

CHAPTER 5

IMPROVED CLEAN AIR INDUCTION SYSTEM

CREW OPERATION/MAINTENANCE

5-1. General.

This chapter contains a description, and inspection and maintenance instructions that the crew

is authorized to perform to keep the improved clean, air induction system operational. A large

percentage of engines have to be replaced because dust, dirt, and foreign material is drawn into

the engine due to a defective air induction system. The crew is responsible for the condition of

C r e w maintenance, for the improved air induction system, is limited to

t h e vehicle.

p e r f o r m a n c e of the daily preventive maintenance, checks, and services PMCS. Report all

u n c o r r e c t e d defects to organizational maintenance. The crew may perform other maintenance

procedures, but only under the direction of organizational maintenance.

5-2. Improved Clean Air System.

T h e improved clean air system operates essentially the same way as

General.

c o n v e n t i o n a l system, but incorporates improved air induction components, a dust

e j e c t o r system that takes the place of the air cleaner centrifugal fans, and a dust

detector.

Improved air induction components include

I m p r o v e d Air Induction Components.

r e d u c e d restriction inlet and outlet elbows and hoses, improved clamps, improved

gaskets and studs, spring loaded filter element, and late model filter clog indicator.

Vehicle Exhaust Dust Ejector System (VEDES). The vehicle exhaust dust ejector

system (VEDES) (fig. 5-1) replaces the air cleaner centrifugal fans. The air cleaner

h o u s i n g is modified to plug the fan exhaust elbows and to accommodate a tube

manifold with its associated hoses, clamps, and mounting bracket installed in place of

t h e fans. A system of dust scavenge tubes, check valves, and exhaust pipes with

integral dust ejectors is mounted along each cylinder bank above and parallel to the

V E D E S scavenges dust from the precleaned

e n g i n e and transmission oil coolers.

section of the air cleaners through suction action of the exhaust ejectors.

Engine exhaust blowing by ejector nozzles at the exhaust outlet causes a pressure drop

which creates the air flow for the scavenging action in the precleaners. Dust-laden

scavenge air flows from the precleaned chamber through the ejector collector ring and

m i x e s with the exhaust gasses at the nozzle outlet, after which the exhaust/dust

mixture is ejected through the exhaust pipe.

Dust Detector. The dust detector system (fig. 5-2) uses engine air induction manifold

p r e s s u r e to circulate air through filter strips in the dust detectors mounted in the

turbo supercharger compressor housing. When the filter strip(s) become clogged, the

resultant change in pressure actuates a pressure switch which illuminates the power

plant warning light and the dust detector warning light in the driver's compartment. A

d u s t detector warning light ON indicates a restricted falter strip in either or both

engine bank dust detectors.

5-1