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

Answer 10

African or European?

Monty Python and the Holy Grail