Learning Objective: Recognize the
purpose and types of auxiliary
drive mechanisms; and specify the
general inspection and maintenance
requirements.
5-61.
5-62.
5-63.
5-64.
5-65.
What is the purpose of the chain
drive mechanism that drives the
blower on a diesel engine?
2.
To increase
the speed of rotation
1.
To reduce the speed of rotation of
of the blower
the blower
3.
To time the operation of the blower
in the correct sequence of events
with the operation of the engine
4.
To prevent overspeeding of the blower
What gears are used in the gear train for
the auxiliary mechanisms of most internal
combustion engines?
1.
Bevel gears
2.
Single helical spur gears
3.
Double helical spur gears
4.
Worm gears
Most internal combustion engine drive
gears are constructed of which of the
following materials?
1.
Steel
2.
Cast iron
3.
Bronze
4.
Fiber
What is the function of idler gears in a
timing train?
1.
To reduce the speed of the camshaft
2.
To increase the speed of the camshaft
3.
To reduce vibrations in the gear
train
4.
To transfer the rotation of the
crankshaft over a considerable
distance
What is the speed of the camshaft in a
four-stroke cycle engine when the
crankshaft is turning 920 rpm?
1.
230 rpm
2.
460 rpm
3.
690 rpm
4.
920 rpm
5-66.
5-67.
5-68.
5-69.
5-70.
5-71.
Question 5-66 is to be judged True
or False.
A longitudinal movement may be produced
by an operating gear in a train that is
secured with a loosely fitted woodruff
key.
What is the purpose for marking the
teeth in an engine gear train as shown
in figure 3-24 of your textbook?
1.
To indicate the gear diameters
2.
To provide a means for mating the
gears
3.
To identify the size of the gear
teeth
4.
To indicate the number of gear
teeth
If the bushing clearances on the timing
gear train exceed the allowable limit,
the bushings should be
1.
aligned
2.
adjusted
3.
reshimmed
4.
renewed
If the only defect found in the auxiliary
drive gears is a chipped gear tooth,
which of the following actions should you
take?
1.
Rebuild the tooth by welding
2.
Smooth the chipped area by filing
3.
Replace the gear
4.
Realign the gear
When the backlash of a blower rotor gear
set exceeds the manufacturer's specified
limit, what must you do?
1.
Replace the gears
2.
Replace the rotors
3.
Retime the gears
4.
Reshim the rotors
Excessive backlash of the blower rotor
drive gears may cause scoring of which of
the following parts?
1.
Blower casing
2.
Shim plates
3.
Shaft seals
4.
Blower lobes
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