205F - Non-Electric Cranking Systems

Question 1

Air powered cranking systems will crank the engine for approximately how many seconds?

Answer 1

9 seconds

205F pg. 1

Question 2

Hydraulic powered cranking systems will crank the engine for approximately how many seconds?

Answer 2

4 seconds

205F pg. 1

Question 3

Air cranking motor assemblies consist of what three main components?

Answer 3

• Air motor
• Reduction gear
• Drive pinion mechanism

205F pg. 4

Question 4

What are two common air cranking motor internal design styles?

Answer 4

• Vane
• Turbine

205F pg. 5

Question 5

In an air cranking motor, what is the reduction gear set designed to achieve?

Answer 5

Increase torque while decreasing rpm

205F pg. 5

Question 6

What are the two main types of air cranking motor drive mechanisms?

Answer 6

• Inertia drive
• Overrunning clutch

205F pg. 6

Question 7

How does an inertia drive mesh the drive pinion with the ring gear?

Answer 7

The inertia developed when the starter initially energizes slides the drive pinion outward along the spiral-cut shaft screw and into mesh with the ring gear.

205F pg. 6

Question 8

How does an air cranking motor overrunning clutch mesh the drive pinion with the ring gear?

Answer 8

Uses an air shift mechanism to engage the drive pinion mechanism.

205F pg. 6

Question 9

True/False
The accumulator used in a hydraulic cranking system is designed to absorb hydraulic pressure fluctuations during starter motor operation.

Answer 9

False.
Accumulator provides the pressure to turn the starter motor.

205F pg. 17

Question 10

What is the airspeed velocity of an unladen swallow?

Answer 10

African or European?

Monty Python and the Holy Grail