Deck 11: Crankshaft, Bearings, and Engine Balancing

Question 1

Damaging the tone ring on a crankshaft can result in computer problems.

Answer 1

False

Question 2

Cast nodular iron crankshafts require extra care in grinding.

Answer 2

False

Question 3

Technician A says that bearing clearance can be reduced by as much as 40% with aluminum bearings. Technician B says excessive crush will allow a bearing to move back and forth in the bore. Who is correct?

A) Technician A
B) Technician B
C) Both technicians
D) Neither technician

Answer 3

A

Question 4

Every other rod journal has a counterweight.

Question 5

All of the below are causes of thrust bearing failure, EXCEPT _____.

A) missing or poor electrical grounds
B) excessive torque convertor pressure
C) poor thrust bearing surface finish
D) a correctly installed rope seal

Question 6

What are engines called that are balanced with part of the counterweight on the flywheel or damper?

Question 7

Technician A says the outer ring of the vibration damper can slip out of position. Technician B says the most vibration occurs at the rear of the crankshaft. Who is right?

A) Technician A
B) Technician B
C) Both technicians
D) Neither technician

Question 8

Why do 90-degree V6 engines use soft engine mounts?

Question 9

A copper-lead bearing can carry loads as high as _____ psi.

A) 7,000
B) 8,000
C) 10,000
D) 12,000

Question 10

Thrust bearings are being discussed. Technician A says the thrust bearing surface facing the front of the engine shows the most wear. Technician B says the most common cause of thrust bearing failure is too little clearance. Who is correct?

A) Technician A
B) Technician B
C) Both technicians
D) Neither technician

Question 11

How is dynamic imbalance corrected?

Question 12

To clean minor rust from a crankshaft journal, use a 300-grit sandpaper.

Question 13

Engine balance is being discussed. Technician A says balance in an in-line engine is not as important as in a V-type engine. Technician B says some steel crankshafts must not be replaced with a cast crankshaft or balance problems may occur. Who is right?

A) Technician A
B) Technician B
C) Both technicians
D) Neither technician

Question 14

Technician A says a typical V8 can be balanced in about 30 minutes. Technician B says in-line engines do not use bob weights. Who is correct?

A) Technician A
B) Technician B
C) Both technicians
D) Neither technician

Question 15

How do forged crankshafts compare to cast crankshafts in terms of strength and cost?

Question 16

At the factory, what part does the reciprocating weight of the pistons and rods play?

Question 17

Technician A says the rotating end of the connecting rod is the big end. Technician B says the reciprocating end of the connecting rod is the big end. Who is correct?

A) Technician A
B) Technician B
C) Both technicians
D) Neither technician

Question 18

Technician A says many balance shafts are supported by needle bearings. Technician B says as the piston approaches TDC, its force pulls the engine up. Who is correct?

A) Technician A
B) Technician B
C) Both technicians
D) Neither technician

Question 19

Technician A says excessive drive belt tension can cause wear on the upper, front main bearing. Technician B says maintaining proper oil clearance and a lower viscosity oil will increase the fatigue life of a bearing. Who is right?

A) Technician A
B) Technician B
C) Both technicians
D) Neither technician

Question 20

Undersize bearings have a thinner bearing back.