PRINCIPLES GASOLINE/DIESEL FUEL SYSTEMS - OD1620 - LESSON 2/TASK 2
(1) General. The ether injection system assists in the cold weather
starting of a diesel engine by injecting ether into the intake manifold.
Ether, which is very volatile, will vaporize readily in cold weather,
initiating combustion.
(2) Operation. A pressurized canister containing ether is fitted to
the engine.
The flow of ether from the canister to the spray nozzle is
controlled by a solenoid valve that closes when it is deenergized.
This
solenoid is controlled by a pushbutton switch on the instrument panel.
(a) When the switch is pushed, the solenoid is energized.
This
opens the ether canister. Pressure from the canister pushes ether through a
connecting tube to the nozzle, where it discharges into the intake.
(b) The system contains a coolant temperature sensor that will
keep the system from functioning when coolant temperature is above 50 F.
8.
a. General. Thorough and careful filtration is especially necessary to
keep diesel engines efficient. Diesel fuels are more viscous than gasoline
and contain more gums and abrasive particles that may cause premature wear
of injection equipment.
The abrasives may consist of material that is
difficult to eliminate during refining, or they may even enter the tank
during careless refueling. Whatever the source, it is imperative that means
be provided to protect the system from abrasives.
b. Configuration.
Most diesel engine designs include at least two
filters in the fuel supply systems to protect the closely fitted parts in
the pumps and nozzles.
The primary filter usually is located between the
fuel tank and the fuel supply pump.
The primary filter contains a coarse
filter medium that removes the larger foreign matter. The secondary filter
usually is located between the fuel supply pump and the fuel injection pump.
The secondary filter contains a fine filter medium that removes even the
most minute traces of foreign matter from the fuel.
Additional filtering
elements are frequently installed between the injection pump and the nozzle.
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