TERMINAL
Q4-29.
The purpose of the distribution pressurized
injector nozzle is to perform which of the
following functions?
BODY
1. It meters and times the fuel injection
2. It creates fuel pressure to be injected into
the cylinder
3. It store excess fuel until it is needed for
injection
4. It limits the amount of fuel to the cylinder
during off-load conditions
Q4-30.
The unit injector system is operated by which
ELEMENT
of the following components?
1.
By the cam shaft rotation
2.
By the push rod and rocker arm
3.
By the crank shaft rotation
ASf04049
4.
By the hydraulic lifters
Figure 4-49.--Glow plug.
Q4-31.
Prior to the air being drawn into the cylinder
of a diesel engine, the purpose of the pre-
which is injected into the intake manifold as you crank
heater is to perform which of the following
the diesel engine. Since ether has a low ignition point,
functions?
the heat generated in the combustion chamber is able to
ignite it. Heat from this ignition then ignites the diesel
1. Warm the air with an electric coil
fuel and normal combustion takes place. Once the die-
2. Pre-ignite the fuel prior to it entering the
sel engine starts, no more fluid is needed.
cylinder
When using cold weather starting aids, be sure to
3. Warm the air by using engine heat prior to
follow the manufacturer's instructions to prevent dam-
it entering the cylinder
age to the engine or the starting aid.
4. Burning a small amount of the diesel fuel
in the air prior to the air entering the
Q4-26.
Fuel injector pumps require assistance to
cylinder
transfer fuel from the supply tank to the
injector pumps from which of the following
Q4-32.
Where in a diesel engine are the glow plugs
components?
located?
1.
An injection metering device
1.
In the intake manifold
2.
A pressure regulator
2.
In the combustion chamber
3.
A boost pump
3.
In the precombustion chamber
4.
A supply pump
4.
In the heads next to the intake valves
Q4-27.
Gear and vane type pumps are two classi-
Q4-33.
During cold weather starting of a diesel en-
fications of what type of fuel pumps used on a
gine, into what part of the engine is starting
diesel engine?
fluid injected?
1.
Boost pumps
1.
The precombustion chamber
2.
Injection pumps
2.
The combustion chamber
3.
Supply pumps
3.
The intake manifold
4.
Metering pumps
4.
The injector nozzle
Q4-28.
Which of the following terms is use to de-
scribe the process of breaking up of the fuel
DIESEL FUEL SYSTEM
into small particles as it enters the cylinder?
MAINTENANCE
1.
Timing
LEARNING OBJECTIVES: Identify proce-
2.
Injection
dures for inspecting, checking, testing, and
3.
Atomization
adjusting diesel engine fuel systems. Identify
4.
Metering
procedures for troubleshooting diesel engine
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