CHAPTER 1: INTRODUCTION
TM 9-2350-256-20
1-28 DEEP WATER FORDING KIT-Continued
k. FIRE EXTINGUISHER SYSTEM
Seven rubber fire extinguisher nozzle caps protect the extinguisher system from the entrance of water and contaminants.
These caps are not sealed and would be blown off from the nozzles upon release of the system.
I. SEALING AND MISCELLANEOUS MATERIALS'
Nonhygroscopic tape is applied around the transmission oil filler neck, and to excessively large open areas if required.
Fording sealer is used as a sealing compound around exterior stowage compartment doors, main winch cable opening,
removable hull front cover, and all mounting. surfaces of the vehicle and deep water fording components.
Electrical insulating and sealing compound is used to seal all exposed electrical connections except battery terminals.
Asbestos sealing compound is used to seal battery terminals.
Wiping cloths are supplied to be used in cleaning and drying the vehicle preparatory to sealing.
Spanner wrenches are provided for installing multipurpose hose.
1-29 RADIO INTERFERENCE SUPPRESSION
Radio interference suppression is the elimination or minimizing of electrical disturbances which interfere with radio
reception or disclose the location of the vehicle to sensitive electronic detectors. It is important, therefore, , that all
vehicles be suppressed properly to prevent interference with radio reception by the same vehicle, neighboring vehicles,
or installations. Essentially, suppression is attained by providing a low-resistance path to ground for stray currents. The
methods used include shielding the ignition and high-frequency wires, grounding the frame with bonding straps, and
using capacitors and resistors.
a. INTERFERENCE SUPPRESSION COMPONENTS
1 Preheat system.
High-tension cable. The high-tension cable to the spark plug preheater consists of an inner conductor which
carries the high voltage to the spark plug, and an outer braided conductor which serves as a shield and also
grounds the metal exciter housing to the spark plug housing. The exciter housing is also grounded to the vehicle
engine through one of the leads (connected to terminal B) in the exciter power input cable.
Spark plug. The spark plug is integrally shielded and contains an integral resistor-suppresser.
2 Generating systems. The engine generator and auxiliary engine generator are radio interference suppressed in an
identical manner by use of feedthrough capacitors. These feedthrough capacitors are mounted on and extend through
the side of the junction box mounted on the generators. The mounting frames of the capacitors are grounded to the box
by means of tooth-type lockwashers. The armature circuit capacitor valve is 1.75 microfarads (mfd), and rated at 100 V
dc at 300 A. The field and interpole circuit capacitors are both 0.25 mfd, and rated at 100 V dc at 10 A. The blower
attached to the engine generator also has a 0.25-mfd, 100 V dc, 20-A, feedthrough capacitor in series with each power
lead.
1-36
