| Tweet |
Custom Search
|
|
|
||
 TM 55-1905-223-24-5
(b) Sealing Additives. Sealing additives are not to be used in the cooling system. They will
build up in the low flow areas and clog the cooling system.
(c) Soluble Oils. Do not use soluble oils in the cooling system. They may cause cylinder liner
pitting and damage heat transfer surfaces, seals, and hoses.
(d) Coolant Additives and Filters. Diesel coolant additives are required to protect the cooling
system from fouling and corrosion. The coolant filter is required to protect the coolant system from abrasive
materials, debris, and precipitated coolant additives.
(6) Coolant Heating. The engine is equipped with a coolant heater that operates on the principle of
thermosiphon when the engine is shut down. An oil pressure switch automatically turns the heater on and off.
The heater comes on when the engine is shut down. Heated coolant expands and forces a flow check valve on
the water inlet closed. The heated coolant is forced up the outlet to the top of the engine. When pressure
drops in the tank, cold coolant enters the tank and the cycle is repeated. A flow through thermostat installed in
the inlet line of the engine heater measures the coolant at its coldest point and keeps the coolant within the
preset temperature range.
e. Air System. The diesel engine requires hundreds of gallons of air for every gallon of fuel that burns.
For the engine to operate efficiently, it must breathe freely. Intake and exhaust systems must not be restricted.
The intake air is routed through an air cleaner. The cleaner is mounted on the engine. Air is routed from air
cleaner directly to intake air manifolds or turbocharger. The turbocharger forces additional air into combustion
chambers, so that engine can burn more fuel and develop more horsepower than if it were naturally aspirated.
The turbocharger consists of a turbine wheel and a centrifugal blower, or compressor wheel separately encased
but mounted on and rotating with a common shaft. The power to drive turbine wheel - which in turn drives the
compressor - is obtained from energy of the engine exhaust gases. Rotating speed of the turbine changes as
the energy level of gas changes; therefore, the engine is supplied with enough air to burn fuel for its load
requirements. The turbocharger is lubricated and cooled by engine lubricating oil.
f. Electrical System. The electrical power to the engine is a 24 volt circuit coming from the batteries to a
magnetic switch, instrument panel, and starter motor and solenoid. Operational gauges and switches-for local
control of the engine are mounted on the instrument panel on top of the engine.
1-12
|
||
|
||
