SECTION III: PRINCIPLES OF OPERATIONTM 9-2350-256-20c. ENGINE AIR INLETThe engine air inlet system provides for the use of outside air for the engine while the vehicle is in the water. The systemconsists of two pipes and two rubber seals, which cover and seal each of the air intake vents on the top of the vehiclecab.d. ENGINE GENERATOR COOLING EXHAUSTThe engine generator electrical output is switched off and the valve assembly closed by the driver from the crewcompartment to prevent water from entering the generator.e. APUPreparations and precautions are taken before and after submersion of the APU to prevent corrosion and separation ofhot leads due to electrolysis by exposure to salt water, and the destruction of the brushes, brush holders, and armatureby sand.f. PERSONNEL HEATERThe personnel heater is not operable during fording operations. The air inlet and exhaust outlets are plugged duringfording operations and unplugged after fording operations.g. ACETYLENE COMPARTMENT VENTA vent assembly consisting of tubing, fittings, adapter plate, and gasket is attached to a boss which surrounds the fourvent holes in the left rear of the cab, to provide ventilation of the compartment during the deep water fording operation.Two clips mounted onto the left engine air intake pipe support the vent system.h. FUEL TANK VENTTwo 90-degree elbows, a rubber hose, two hose clamps, a seal, and a clip are the components used to vent the fueltanks. The rubber hose is clamped to an elbow in the left engine air intake pipe and to an elbow in the fuel tank's fillercover. The seal is installed between the bottom of the fuel tank filler cover and the top of the fuel tank filler cap toprevent entry of water. The clip, attached to the acetylene vent cover, keeps the hose from hanging free and being torn.i. BILGE PUMP, MOTOR, AND SUPPORT ASSEMBLYA centrifugal-type bilge pump with motor and support assembly is installed on the hull floor in the winch compartment.The pump is used to remove any water which may enter the compartment during fording. The discharge of the pump isdirected through the bilge pump hose to an outlet adapter, mounted onto the right side of the personnel compartment. Amultiple purpose (wash vehicle, etc.), dacron rubber-lined hose with nozzle can be attached to the outlet adapter. Atoggle switch and indicator lamp for operating the pump are located at the right of the driver's seat on the accessoriespanel. A relay, which is activated by the toggle switch, controls the pump motor. A circuit breaker mounted under thefloor plates and on the same plate as the relay provides overload protection for the pump circuit. The switch and relaycoil circuit is protected by a circuit breaker in the accessories panel.j. CREW FAN AIR DUCT HOUSING AND BOOM BOOT DRAINSA rubber seal between two metal plates fits into and seals the crew fan air duct housing. Shutoff hose clamps are usedto control water flow from the crew fan air duct housing and boom boot drains.1-35
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