TM 9--2350--292--20--1
0005 00--1
THEORY OF OPERATION
0005 00
THIS WORK PACKAGE COVERS:
Powerpack, Tracks and Suspension, Fixed Fire Extinguisher System, Hydraulic System, Winch and Spade
Assemblies, Auxiliary Power Unit, Gas/Particulate Filter Unit (GPFU), M2A2 Air Purifier with M3 Heaters, Smoke
Grenade Launcher System, M239, Exhaust Smoke Generating System, Deep Water Fording Kit, and Electrical
System
POWERPACK
Consists of the engine, cross--drive transmission and right and left output reduction gear drive. The powerpack is
removed from the vehicle as one complete unit.
The front of the engine is referred to as the damper--end or front, the rear of the engine is referred to as the fly-
wheel--end or rear. As viewed from the front or damper--end toward the rear or flywheel--end, the side to the right is
called the right--side and the side to the left is called the left--side. Viewing the engine from the front, the right bank
of cylinders is numbered 1R through 6R and the left bank of cylinders is numbered 1L through 6L.
6R
5R
4R
3R
2R
1R
MAIN ENGINE
ENGINE REAR
(FLYWHEEL END)
ENGINE FRONT
(DAMPER END)
6L
5L
4L
3L
2L
1L
VEHICLE
LEFT
VEHICLE
FRONT
VEHICLE
REAR
CROSS--DRIVE
TRANSMISSION
(CENTER
SECTION)
VEHICLE
RIGHT
LEFT
OUTPUT
REDUCTION
GEAR
RIGHT
OUTPUT
REDUCTION
GEAR
LEFT DRIVE
SPROCKETS AND HUB
RIGHT DRIVE
SPROCKETS AND HUB
LEFT
DRIVE
COUPLING
RIGHT
DRIVE
COUPLING
ENGINE
RIGHT
BANK
ENGINE
LEFT
BANK
ENGINE
The Teledyne Vehicle Systems model AVDS--1790--8CR engine is a 12--cylinder, 90--degree, V--type, 4--cycle, air--
cooled, turbosupercharged diesel engine. The cylinder assemblies are individually replaceable units with overhead
valves and valve rocker assemblies in the head. The cylinders are arranged in two banks of six cylinders each.
Each bank of cylinders has an overhead camshaft arrangement to actuate the valves of each cylinder.
The engine’s fuel injection system utilizes a fuel metering pump which supplies metered fuel to individual cylinders
through fuel injector nozzles. The engine fuel pump assembly, located at the front of the engine, delivers fuel to the
metering pump. A turbosupercharger is located on each side of the engine at the rear. The exhaust--gas driven
turbosupercharger increases the air flow pressure entering the air intake manifolds.
