MWO-9-2300-378-34-2
TANK, COMBAT FULL-TRACKED
MODIFICATION WORK ORDER
JUNE 1984
MWO-9-2300-378-34-2 - Page 7 of 92
MWO 9-2300-378-34-2
g.
Additional Information.
(1) Kits - There are two basic kits used in the installation of the Vehicle Engine
Exhaust Smoke System (VEESS). Teledyne Continental Motors Kit P/N 12275734 (figure l) is
used for the engine portion and General Dynamics Kit p/N 12290438 (figure 2) is used for the
hull wiring portion of the modification.
(2)
Powerpack Removal - The powerpack
must be removed to perform this
modification.
(3) General Description of operation
- The vehicle engine exhaust smoke system
(VEESS) (refer to figures 3 and 4) operates by tapping fuel from the outlet of the engine driven
fuel pump on the front of the engine downstream from the fuel/water separator. The fuel is
then routed through a manual shut-off valve and through two solenoid valves at the rear of the
engine.
Fuel is then injected into the left and right exhaust pipes upstream of the
turbochargers at a rate of approximately 1 gal/rein.
Raw fuel injected into each hot turbo is
instantly vaporized and a dense white cloud of smoke is emitted from the exhaust stacks.
Two solenoid valves are used as a safety feature in the event one of the solenoid
valves should stick open.
Voltage is supplied to the solenoid valves from the air cleaner blower
motor relay.
Since this relay does not close until the generator comes up to operating voltage
(28 vdc), the solenoid valves will not actuate until the engine is ruining and the smoke switch is
on.
The manual shut-off valve is used as a troubleshooting aid only and must normally
be left in the open position (see figure 16).
8.
SUPPLY KITS/PARTS AND DISPOSITION.
a. Kits/Parts
Required to Accomplish Modification.
The following engine kit 12275734
(figure 1) and hull wiring kit 12290438 (figure 2) are required to accomplish the modification.
Check kits for completeness before starting the job.
5
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