303K: Clutch Fundamentals & Service (Off-Road)

Question 1

Flywheel and clutch housing face runout checks are conducted to ensure components will be parallel to one another during operation. (T/F)

Answer 1

True

303K Pg. 13

Question 2

Why is the engagement pull in force of an overcentre clutch important?

Answer 2

Ensures proper clamping force on the friction disc.

Question 3

A typical overcentre clutch uses a special adapter ring to position and drive the clutch discs. (T/F)

Answer 3

True

303K Pg. 3

Question 4

Friction discs in an overcentre clutch cannot be glazed by oil because they are made of a very absorbent, porous material. (T/F)

Answer 4

False. It is possible for them to become glazed by oil.

303K Pg. 10

Question 5

Overcentre clutches use a type of linkage that requires a snap, overcentre movement of the clutch handle during the engagement and disengagement process.

Answer 5

True

303K

Question 6

A spring scale positioned at a specific distance up the clutch handle is used to
calculate the amount of pull required to cause an overcentre clutch to snap into
engagement. (T/F)

Answer 6

True

303K Pg. 10

Question 7

List three types of special application clutches.

Answer 7

• Sprag
• Spring and roller overrunning
• Dog
• Cone and bevel
• Electromagnetic
• Oil (wet)

303K Pg. 18

Question 8

What is one advantage of using an electromagnetic type clutch?

Answer 8

Mechanical linkage is eliminated and the clutch can be activated from a distance.

303K Pg. 21

Question 9

An electromagnetic clutch is engaged by current flow in the electromagnet and held in engagement by centrifugal force.

Answer 9

False. Engaged and held in engagement by the electromagnet.

303K

Question 10

An electromagnetic clutch is disengaged by applying reverse current flow in the
electromagnetic windings. (T/F)

Answer 10

False. Disengaged by disconnecting the power to the electromagnet.

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Question 11

Explain the advantage of using an oil clutch.

Answer 11

• Oil can cushion the clutch discs and pressure plates during engagement.
• Oil cools and cleans the clutch assembly during operation.

303K Pg. 22

Question 12

When checking flywheel housing face runout, what should be done with the crankshaft to eliminate inaccuracies caused by crankshaft movement?

Answer 12

Move the crankshaft fully forward or rearward to eliminate any inaccuracies caused by crankshaft end play.

303K Pg. 13

Question 13

What is an overrunning clutch?

Answer 13

A clutch that will drive in one direction and freewheel in the opposite direction.

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Question 14

The basic spring and roller overrunning clutch is considered what type of clutch?

Answer 14

A one-way clutch. It can only be engaged in one direction. It will freewheel in the opposite direction and prevent the drive component from overspeeding.

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Question 15

The drive ring/adapter plate in an overcentre clutch is bolted to the flywheel and is splined to to the clutch ________.

Answer 15

Discs

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Question 16

What could a leaking rear engine seal cause in an overcentre clutch?

Answer 16

Cause the friction discs to glaze and thus causing the clutch to slip.

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Question 17

Pressure plates in an overcentre clutch should be inspected for what?

Answer 17

Warpage, wear, cracks and signs of over heating

303K Pg. 10

Question 18

Brass release bearings in a clutch should be inspected for:

Answer 18

Wear and proper clearances

303K Pg. 10

Question 19

What should be checked after installing an overcentre clutch?

Answer 19

Crankshaft end play

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Question 20

How would flywheel housing concentricity be checked during an overcentre clutch installation?

Answer 20

Position the dial indicator base on the crankshaft flange and the gauge against the inner side of the flywheel. Rotate the engine and measure the runout.

303K Pg. 16

Question 21

In an overcentre clutch, which of the following components is closest to the flywheel?

a) Floating Pressure Plate
b) Backpressure Plate

Answer 21

Backpressure Plate

303K Pg. 4

Question 22

In an overcentre clutch, which of the following components is furthest from the flywheel?

a) Floating Pressure Plate
b) Backpressure Plate

Answer 22

Floating Pressure Plate

303K Pg. 4