Assignment 6
Engine Maintenance (cont'd); Reduction Gears and Related Equipment
Textbook Assignment: Engineman 1&C, NAVEDTRA 10543-E1, Pages 4-1 through 4-11
Learning Objective: Recognize
conditions which may affect
reduction gear operations and the
necessary corrective actions to
be taken.
6-1.
Under normal conditions, which of the
following activities effects repairs to
the main reduction gears?
1.
Ship's force
2.
Repair ships
3.
Manufacturer
4.
Naval shipyards
6-2.
To ensure that gears are properly
lubricated, an engineman must ensure that
which of the following conditions are met?
1.
The oil is clean
2.
The oil is kept at the correct
temperature
3.
The proper amount of oil is supplied
to the gears and bearings
4.
All of the above
Question 6-3 is to be judged True or
False.
6-3.
The reduction gear manufacturer designates
the exact relief valve settings and
pressure to be maintained in the
lubrication system to ensure an adequate
supply of oil to the gears and bearings.
6-4.
What is the likely result of delivering
too little or too much oil to a bearing?
1.
An overheated bearing
2.
An underheated bearing
3.
A drop in oil pressure
4.
A drop in oil temperature followed by
a sharp rise in pressure
6-5.
Under any operating condition, what is the
maximum permissible temperature rise for
oil passing through engine bearings.
1.
50°F
2.
60°F
3.
65°F
4.
70°F
6-6.
What is the maximum allowed temperature of
the oil leaving any reduction gear or
bearing?
1.
165°F
2.
175°F
3.
180°F
4.
195°F
6-7.
Fine metal flakes are usually produced
during run-in of new gears. These fine
metal particles, if not removed from the
reduction gear lube oil system, may cause
which of the following troubles?
1.
Wiped bearings and scored journals
2.
Clogged spray nozzles
3.
Deteriorated gear teeth
4.
All of the above
6-8.
Which of the following types of damage to
gear teeth surfaces are most likely to
result if lubricating oil is contaminated
by water?
1.
Erosion and corrosion
2.
Corrosion and pitting
3.
Corrosion and scoring
4.
Erosion and scoring
6-9.
The journals of the main gear are severely
corroded because of lube oil
contamination. What repair work should be
done as soon as possible?
1.
Overhaul of the gears at a naval
shipyard
2.
Removal of metal flakes from the oil
system
3.
Realignment of the reduction gears
4.
Replacement of the pinion bearings
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