Questions on Bearings:
Precision engine bearing
inserts are manufactured with a small portion of the bearing ends extending
beyond the bearing housing or caps. The
installation process of these bearings requires sufficient ________./crush
Bearing wear on a split
sleeve type bearing is measured with a ____________./ball anvil micrometer
The amount of wear on a
split precision main bearing can be accurately determined by comparing the data
from a previous reading to the present readings taken with a ____________./ball
anvil outside micrometer
The amount of wear on a
split, fixed sleeve-type, main diesel
bearing can be accurately determined with a ________./ball anvil outside
micrometer
Which of the bearings
listed are most widely used for the main and connecting rod bearings of a
diesel engine?/Precision insert
Which of the following
methods is normally used to lubricate bearings in a small high-speed diesel
engine?/Pressure lubrication
Which of the following is
an example of a solid bearing?/Piston pin bushing
In a diesel engine, the
main bearings are used between the _____________./crankshaft and the engine
block
Which of the listed
bearing installations is subjected to swinging motion?/Wrist pin bearings
Bearing "crush"
as applied to diesel engine main bearings, will result in _____________. ( the common word used is "nip"
)/positive seating of the bearings in their housings
A main propulsion diesel
engine crankshaft bearing lacking sufficient "crush", will
_____________./tend to rotate with the journal
Which of the bearings
listed is most widely used for main and connecting rod bearings of modern
diesel engines?/Precision insert
Diesel engine main and
connecting rod precision bearings are made in halves. Each half exceeds
one-half the bearing circumference by a
small amount. The small amount is termed
_____________./crush
The proper location for
journal bearing oil grooves is
_______________./as a side relief where the two shells meet
A characteristic of a
bearing material which permits small dirt particles to become embedded in it's
surface is ________________./desirable,
as it will prevent damage to the journal surface
Which bearing half will
receive the greatest load in a
two-stroke/cycle diesel engine?/Lower half of the piston pin bearing in
the connecting rod.
Which of the statements
represents a characteristic of the thrust collar in a Kingsbury thrust
bearing?/It turns with the shaft and the pivot shoes do not rotate.
The leveling plates in a
Kingsbury thrust bearing are held in position by _____________./dowels and pins
The bearings used to
support the crankshaft are generally called __________./main bearings
The nuts of main
bearings, connecting rod bolts and all
other moving parts are to be secured by ________./split pins or other
effective means
On most modern diesel
engines, the main and connecting rod bearings receive their lubricating oil by
____________./pressure feed
Proper lubrication of the
main bearings is more easily obtained in
a single acting four-stroke/cycle diesel engine than in a single acting
two-stroke/cycle diesel engine because ____________./bearing
pressure in a four-stroke/cycle single acting diesel engine is continually
reversed
Lubricating oil is
supplied to the crankpin bearings in a marine diesel engine by
_____________./internal crankshaft passages
On a medium-speed main propulsion
diesel engine, the crankpin or crank
journal bearings receive lubricating oil from _____________./drilled passages
in the crankshaft
Lubricating oil systems
for diesel engine journal bearings are usually lubricated by which of the
following types of lubricating oil systems?/Pressure
Wristpin bearings are
difficult to lubricate because of their
oscillating motion and _____________./their position in the lubrication system
While inspecting the main
bearings on a diesel engine you find impregnated dirt and scratches in the
bearing surface. You would, therefore, suspect that ___________./the lube oil
was not being properly filtered
The most crucial time for
any bearing with regards to lubrication
is _____________./during starting
To guarantee that a reduction
gear bearing is receiving proper oil supply, you should check the
___________./bearing lube oil temperature
The load is always placed
on the lower half of the main bearings
in a/an ____________./two-stroke/cycle engine
Which term describes
piston pins having bearing surfaces in both the piston bosses and connecting
rod eye?/Full floating
A thrust bearing is used
with a propulsion diesel engine to _____________./control axial movement of the
crankshaft
What is the function of
the main thrust bearing?/Transmits propeller thrust to the hull.
Kingsbury thrust bearings
are lubricated by _____________./flooding the thrust bearing assembly with oil
Which of the bearing
types listed is most commonly used in smaller vessel main propulsion reduction
gears as thrust bearings?/Tapered roller bearings
In a Kingsbury thrust
bearing, the thrust shoes are _______./pivoted, and the thrust collar turns
with the shaft
Which of the listed
components will ensure equal continuous pressure on the thrust shoes of a
Kingsbury thrust bearing?/Leveling plates
The highest loads applied
to the diesel engine crankshaft main bearings are ____________./firing loads
A well-lubricated bearing
surface always appears __________./highly polished
In some modern large
diesel engines, which of the followingis used as the support for the main
bearings?/Bedplate
An acceptable means of
tightening connecting rod and mainbearing cap bolts is to measure the
___________. I. torque applied to each
nut and bolt assembly II. stretch of
each nut before and after tightening/I only
Kingsbury thrust bearings
are lubricated by _____________. I. a flooded housing II. oil spray on collar and shoes/I only
Which of the listed
bearing types is an example of a solid bearing?/Piston wrist pin bushing
The upper leveling plates
in a Kingsbury thrust bearing are held in place by _____________./pins through
the base ring
Which of the following
statements represents the proper order
of thrust transmission when a Kingsbury thrust bearing is used with diesel
propulsion?/Propeller shaft, thrust collar, thrust shoes, and thrust bearing
housing
To guarantee that a
reduction gear bearing is receiving proper oil supply, you should check the
___________./bearing lube oil temperature
The thickness of the oil
film to be developed in a diesel engine main bearing, depends upon the
_____________./all of the above
Proper lubrication of the
main bearings is more easily obtained in
a single acting, four-stroke/cycle diesel engine than in a two-stroke/cycle
diesel engine because __________./the direction of pressure on the journals in
four-stroke engines is continuously reversing, whereas in two-stroke engines it
is constant
To measure bearing
clearances, a special small diameter
plastic rod (plasti-gage) is placed between the crankshaft journal and
the connecting rod bearing shell. The actual reading is obtained by
_____________./using the paper or cardboard gauge printed on the plastic rod
package to measure the flattened width
To determine the main
bearing clearance of a propulsion diesel
engine, you should measure the main bearing shell using a ball anvil outside
micrometer and measure the crankshaft
journal using a/an _____________./outside micrometer
On a large low-speed main
propulsion diesel engine, lower main bearing wear is usually measured by using
a/an ______./bridge gage
Which of the devices is
commonly used in measuring the
clearances between the main engine bearings and the crankshaft?/Plasti-gage
To determine the main
bearing clearances in a diesel engine, you should use
_____________./plasti-gage
The insertion of shims
between the foot of a marine type connecting rod and a bearing box would result
in __________./increased compression ratio
Which of the following
operating conditions can occur when shims are removed from the joint between
the foot of a marine type diesel engine
connecting rod and the bearing box?/Decreased compression ratio
Worn main bearings will
cause the compression ratio of an auxiliary diesel engine to
_____________./decrease
An acceptable method of
measuring for the correct rotational force applied to the connecting rod and
main bearing bolts, is to use a _____________./torque wrench
Abnormal crankpin bearing
and piston skirt surface wear indicate
_____________./incorrect connecting rod alignment
Small cracks in the
crankshaft bearing surface of a diesel engine are an indication of
_____________./fatigue failure
Which of the bearings
listed below is most widely used for the main and connecting rod bearings of a
modern high-speed diesel engine?/Precision insert
Which of the bearing
types listed is commonly used for main bearings in small internal combustion
engines?/Replaceable precision-type
Bearing clearances in
small high-speed diesel engines should be measured with _____________./plasti-gage
Which type of wrist pin
uses bearings in the piston bosses, but is fixed to the small end of the
connecting rod?/Semi-floating
Worn main bearings in a
diesel engine can result in _______./decreased compression pressure
You are inspecting the
lower main precision bearings on a diesel engine. You observe that about half
the thin babbitt linings are of a milky white color. This condition is caused
by _____________./water contamination of the lube oil
Bearing clearances in
small high-speed diesel engines should be measured using
_____________./plasti-gage
A bronze bearing liner
with a lead-tin flashing has a
milky-white color over most of its surface and some areas of exposed
bronze. The white coloring indicates _____________./water contamination of the
lube oil system
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