Question 1

Typical journal-to-bearing clearance is ________.

Accepted Answer

A)  0.150 to 0.250 inch
B)  0.020 to 0.035 inch
C)  0.0005 to 0.0025 inch
D)  0.00015 to 0.00018 inchE) A) and B)
F) C) and D)

Question 2

Crankshafts should be stored by which of these methods?

Accepted Answer

A)  Any position
B)  Leaning at a slight angle
C)  Standing or hanging
D)  Standing or lying on its sideE) C) and D)
F) B) and D)

Question 3

Technician A says that oil for the rod bearings comes from splash off the crankshaft. Technician B says that lubrication to the main bearings is fed through the main oil gallery in the block. Who is right?

Accepted Answer

A)  Technician A only
B)  Technician B only
C)  Both technicians A and B
D)  Neither technician A nor BE) None of the above
F) B) and D)

Question 4

Technician A says balance shafts are used to counteract vibration created in the engine. Technician B says proper balancing of the engine is important for smooth operation. Who is right?

Accepted Answer

A)  Technician A only
B)  Technician B only
C)  Both technicians A and B
D)  Neither technician A nor BE) C) and D)
F) A) and C)

Question 5

A typical V-8 engine crankshaft has ________ main bearings.

Accepted Answer

A)  Five
B)  Three
C)  Four
D)  SevenE) A) and B)
F) C) and D)

Question 6

Technician A says that many bearings also have a thin overlay of babbitt. Technician B says that bearings should have spread and crush to keep them from spinning when the crankshaft rotates. Who is right?

Accepted Answer

A)  Technician A only
B)  Technician B only
C)  Both technicians A and B
D)  Neither technician A nor BE) All of the above
F) B) and D) C

Question 7

Crankshaft journals are checked for which of these?

Accepted Answer

A)  Out of Round
B)  Taper
C)  Both A and B
D)  Neither A nor BE) None of the above
F) C) and D)

Question 8

In ________ engines, the cam bearings are installed in the block.

Accepted Answer

A)  Pushrod
B)  Two-stroke
C)  Rotary
D)  Overhead camE) C) and D)
F) None of the above

Question 9

A bearing shell has a sightly larger arc than the bearing housing. This difference is called ________.

Accepted Answer

A)  Bearing saddle
B)  Bearing spread
C)  Bearing tang
D)  Bearing crushE) A) and B)
F) A) and C)

Question 10

A forged crankshaft has a ________.

Accepted Answer

A)  Wide parting line
B)  Thin parting line
C)  Parting line in one place
D)  Both B and CE) B) and C)
F) A) and D) A

Question 11

Technician A says that most crankshafts can be reground to be 0.010, 0.020, or 0.030 inch undersize. Technician B says that most engine bearings are constructed with an aluminum shell for strength and are covered with a tin-lead alloy. Who is right?

Accepted Answer

A)  Technician A only
B)  Technician B only
C)  Both technicians A and B
D)  Neither technician A nor BE) All of the above
F) B) and C)

Question 12

If bearing-to-journal clearance is doubled, how much oil will flow?

Accepted Answer

A)  One-half as much
B)  Four times the amount
C)  Double the amount
D)  The same amount if the pressure is kept constantE) B) and D)
F) C) and D)

Question 13

The crankshaft journals have been turned. What size bearings should be installed?

Accepted Answer

A)  It makes no difference which size is installed
B)  Undersize
C)  Standard
D)  OversizeE) None of the above
F) A) and B) B

Question 14

Bearing ________ occurs when a bearing shell is slightly above the parting surface of the bearing cap.

Accepted Answer

A)  Overlap
B)  Cap lock
C)  Crush
D)  Interference fitE) B) and C)
F) A) and B)

Question 15

Technician A says that a vibration damper, also known as a harmonic balancer, is used to dampen harmful twisting vibrations of the crankshaft. Technician B says that most engines are balanced after manufacturing. Who is right?

Accepted Answer

A)  Technician A only
B)  Technician B only
C)  Both technicians A and B
D)  Neither technician A nor BE) None of the above
F) B) and C)

Question 16

The thrust bearing surface is located on one of the main bearings to control thrust loads caused by ________.

Accepted Answer

A)  Lugging the engine
B)  Torque converter or clutch release forces
C)  Rapid deceleration forces
D)  Both A and CE) A) and B)
F) B) and D)

Question 17

Which of these is a primary cause of secondary vibration?

Accepted Answer

A)  Harmonic balancer
B)  Connecting rod big ends
C)  Flexplate
D)  PistonsE) B) and D)
F) All of the above

Question 18

Why does a 4-cylinder engine have very little, if any, primary vibration?

Accepted Answer

A)  Uses a splayed crankshaft
B)  Bore is small, reducing the primary vibration
C)  Two pistons traveling upward at the same time two pistons are traveling downward
D)  Two cylinders fire at the same time, reducing the primary vibrationE) None of the above
F) B) and D)

Question 19

Which one of these is a thrust bearing?

Accepted Answer

A)  a
B)  b
C)  c
D)  dE) A) and B)
F) A) and C)

Question 20

A four-cylinder engine fires one cylinder at every ________ degrees of crankshaft rotation.

Accepted Answer

A)  270
B)  120
C)  90
D)  180E) A) and B)
F) All of the above

Exam 35: Crankshafts, Balance Shafts, and Bearings

Typical journal-to-bearing clearance is ________.

Correct AnswerverifiedShow Answer

Crankshafts should be stored by which of these methods?

Correct AnswerverifiedShow Answer

Technician A says that oil for the rod bearings comes from splash off the crankshaft. Technician B says that lubrication to the main bearings is fed through the main oil gallery in the block. Who is right?

Correct AnswerverifiedShow Answer

Technician A says balance shafts are used to counteract vibration created in the engine. Technician B says proper balancing of the engine is important for smooth operation. Who is right?

Correct AnswerverifiedShow Answer

A typical V-8 engine crankshaft has ________ main bearings.

Correct AnswerverifiedShow Answer

Technician A says that many bearings also have a thin overlay of babbitt. Technician B says that bearings should have spread and crush to keep them from spinning when the crankshaft rotates. Who is right?

Correct AnswerverifiedC

Crankshaft journals are checked for which of these?

Correct AnswerverifiedShow Answer

In ________ engines, the cam bearings are installed in the block.

Correct AnswerverifiedShow Answer

A bearing shell has a sightly larger arc than the bearing housing. This difference is called ________.

Correct AnswerverifiedShow Answer

A forged crankshaft has a ________.

Correct AnswerverifiedA

Technician A says that most crankshafts can be reground to be 0.010, 0.020, or 0.030 inch undersize. Technician B says that most engine bearings are constructed with an aluminum shell for strength and are covered with a tin-lead alloy. Who is right?

Correct AnswerverifiedShow Answer

If bearing-to-journal clearance is doubled, how much oil will flow?

Correct AnswerverifiedShow Answer

The crankshaft journals have been turned. What size bearings should be installed?

Correct AnswerverifiedB

Bearing ________ occurs when a bearing shell is slightly above the parting surface of the bearing cap.

Correct AnswerverifiedShow Answer

Technician A says that a vibration damper, also known as a harmonic balancer, is used to dampen harmful twisting vibrations of the crankshaft. Technician B says that most engines are balanced after manufacturing. Who is right?

Correct AnswerverifiedShow Answer

The thrust bearing surface is located on one of the main bearings to control thrust loads caused by ________.

Correct AnswerverifiedShow Answer

Which of these is a primary cause of secondary vibration?

Correct AnswerverifiedShow Answer

Why does a 4-cylinder engine have very little, if any, primary vibration?

Correct AnswerverifiedShow Answer

Which one of these is a thrust bearing?

Correct AnswerverifiedShow Answer

A four-cylinder engine fires one cylinder at every ________ degrees of crankshaft rotation.

Correct AnswerverifiedShow Answer

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B

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