Clutch Fundamentals

Question 1

What are the 3 types of pressure springs?

Answer 1

Diaphragm
Perpendicular
Angled

Question 2

Pressure springs are located between what to components?

Answer 2

Clutch cover and pressure plate

Question 3

What are the 2 main types of spring loaded clutches?

Answer 3

Push style

Pull style

Question 4

Push type clutch

Answer 4

Used in lighter duty applications, release shaft and yolk assembly push release bearing toward flywheel. uses a type 1 lever pulling pressure plate and anchored to clutch cover

Question 5

Pull type clutch

Answer 5

Fork pulls the release bearing away from flywheel, this pulls lever arms carrying spring pressure off pressure plate, type 2 lever

Question 6

What are the different ways of actuating the clutch? (3)

Answer 6

Mechanical
Hydraulic
Air-over-hydraulic assist

Question 7

What are the 4 common ways to determine clutch size?

Answer 7

Diameter of disc
O.D. of clutch shaft
Number of splines
Number of dampening springs

Question 8

What it is the most obvious function of the flywheel?

Answer 8

Provide a smooth friction surface for one side of the clutch disc

Question 9

What is the purpose of the pilot bearing?

Answer 9

Bearing that is mounted in hub of flywheel of crankshaft that provides a guide for the nose of input shaft

Question 10

Flat flywheel

Answer 10

Has 2 surfaces, one machined surface where cover is fastened, one friction surface for clutch disc to work against. Will work with both single and double disc clutch assemblies

Question 11

Countersunk flywheel

Answer 11

Has a recessed friction surface, has lugs to drive intermediate plate on double disc assembly.

Question 12

Heavy duty clutch covers are made of what?

Answer 12

Cast iron

Question 13

Pressure plates

Answer 13

Usually made form cast iron, is located inside of the clutch cover and is driven by cover during operation.

Question 14

Perpendicular coil springs

Answer 14

Stand at 90 degrees to the pressure plate, exert tremendous force on the pressure plate

Question 15

Angled coil springs

Answer 15

Placed on an angle to the pressure plate

Question 16

Diaphragm springs

Answer 16

Is a single large plate, creates a multiple of clutch release levers that are used during engagement and disengagement process, made of flat spring steel

Question 17

Rigid clutch disc

Answer 17

Often riveted to a central splined hub that slides on the transmission input shaft splines

Question 18

Dampened clutch disc

Answer 18

Disc is attached to the central splined hub through a limited movement mechanism, commonly springs that are designed to absorb some of the torsional shock loads

Question 19

Marcel spring

Answer 19

Are a wavy spring that may be used to attached disc to hub, used to help reduce impact loads during engagement

Question 20

Organic clutch lining

Answer 20

Often called non-asbestos organic (NAO) linings. Constructed of various binders, resins and fillers.

Question 21

Semi-metallic linings

Answer 21

Similar to organic but have the addition of metallic particles to help where high heat loads could be created

Question 22

Ceramic linings

Answer 22

May be used where heat and heavy load are present

Question 23

Clutch release levers

Answer 23

Are used to move the pressure plate closer to the cover during disengagement. they compress the pressure springs

Question 24

Push type release bearing

Answer 24

Only rotate when foot on pedal, Commonly a type of yolk mechanism that pushes the thrust type bearing toward the release levers

Question 25

Pull type release bearing

Answer 25

Rotates when engine is running, only has load on it when foot on pedal. Yolk pulls the bearing and sleeve assembly including levers away from P.P.

Question 26

How are push type clutches adjusted?

Answer 26

Using the threaded rod in the linkage

Question 27

Clutch brake

Answer 27

The input shaft requires 2 long grooves to line up with the tangs on the brake plate that will connect the 2 parts. Require the trans. input retainer to have machined surface for brake to act against.

Question 28

Torque-limiting clutch brake

Answer 28

Designed to slip above a certain torque load, increasing service life when used improperly.

Question 29

What is the function of the clutch cover

Answer 29

Used to drive the pressure plate, also contain the pressure springs used to apply force to the P.P. Used to mount the P.P to the flywheel

Question 30

What are 3 drive members in a clutch assembly

Answer 30

Flywheel
Clutch cover/P.P assm
Intermediate plate

Question 31

Why would a dampened disc be used

Answer 31

Different types of dampened discs are used to absorb torsional loads depending on application

Question 32

What are the 3 bearings associated with clutches

Answer 32

Pilot
Release
Trans input