6-20.
Aboard ship, special equipment is usually 6-26.
What action should you take when
available to perform which of the
replacing a wiped outboard pinion bearing
following maintenance tasks?
in the reduction gear?
6-21.
6-27.
6-22.
1.
Replace bearings
2.
Lift reduction gear covers
3.
Take readings
4.
All of the above
Which of the following methods is used to
check the amount of bearing wear in the
main reduction gears?
1.
Bridge gage
2.
Crown thickness
3.
Radial clearance
4.
Axial clearance
The pressure-bearing half of a main
reduction gear bearing shell is readily
identified by which of the following
means?
1.
A scribe line on each end of the
shell
2.
Three scribe lines on each end of the
bearing shell
3.
The letter A on each end of the shell
4.
The letters B, C, and D on each end
6-28.
of the shell
1.
Compare the crown thickness of the
new bearing with the original crown
thickness of the old bearing
2.
Compare the new bearing and the old
bearing with the manufacturer's
specifications
3.
Accomplish 1 and 2 above
4.
Measure the crown thickness of the
new bearing and stamp it just prior
to installation
Assume that you are installing a new
bearing. When is the bearing cap
lowered into place and bolted down?
1.
After the lower bearing half is
rolled into position
2.
After the upper bearing half is
placed in position
3.
After the bearing and the dowel are
in proper positions
4.
After all of the above steps have
been accomplished
If a pinion bearing fails, the shaft at
that end tends to
Question 6-23 is to be judged True or
1.
move toward the bull gear
False.
2.
become scored and pitted
3.
move away from the bull gear
6-23.
During the initial alignment, the crown
4.
become cracked and chipped
thickness of each reduction gear bearing
shell should be measured at each scribe
6-29.
After a loss of lubricating oil casualty
line and the clearance permanently
has occurred to the main reduction gear,
stamped close to each scribe line.
what bearings should be checked first?
6-24.
What action should be taken if a bearing
in a main reduction gear wipes during a
trial run?
1.
The gear and shaft should be operated
at reduced speed
2.
The gear should be provided with
additional lubrication
3.
The gear and shaft should be secured
4.
The gear should be cooled with water
6-25.
Before emergency repairs are to be
attempted on the main reduction gear by
the ship's force, what factors should be
considered?
6-30.
1.
Thrust bearings
2.
Pinion bearings
3.
Bull gear shaft bearings
4.
Main propulsion shaft bearings
What precautions must you observe when
working around or inspecting an open
reduction gear?
1.
All tools must be secured with a
suitable line
2.
All loose articles must be taken from
the clothing
3.
The area around the gears must be
covered and clean
4.
All of the above
1.
Ship's location and availability of
repair activity
2.
Ship's operational schedule and
capability of personnel
3.
knowledge of construction details and
manufacturer's instructions
4.
All of the above factors
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