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
