HD4 Clutches

The primary purpose of the clutch is to:

Transmit torque

Disengage power

Engage power

All of the above

Correct! Wrong!

Which of the following clutch components is a driven member?

Clutch cover

Clutch disc

Intermediate plate

Pressure plate

Correct! Wrong!

When the clutch disc turns the input shaft also turns.

True

False

Correct! Wrong!

Changing the pressure plate ring adjustment (internal adjustment) will affect the amount of clutch brake.

True

False

Correct! Wrong!

A vehicle owner complains that he has clutch brake but NO free play, which adjustment requires attention?

Fork to crosshaft adjusment

Linkage adjustment and inspection

Pressure plate ring adjustment

All of the above

Correct! Wrong!

Which of the following driving procedures will likely result in clutch damage?

Driving with a foot on clutch pedal

Using the clutch as a brake to hold the truck on a hill or incline

Coasting downhill with the transmission in gear and the clutch disengaged

All of the above

Correct! Wrong!

Upon a visual inspection, a mechanic finds that the clutch driven discs have several cracks near the center hub. This would be an indication that:

The engine horsepower exceeds the limits of the clutch

There is an alignment problem between the engine and the transmission

The driver has been using the Jacobs brake to aid in shifting

The transmission input shaft bearing is worn

Correct! Wrong!

On a 14 inch pot style clutch, misaligned center disc drive lugs will usually result in:

Vibration

Clutch dragging

Clutch slippage

All of the above

Correct! Wrong!

A warped or distorted flywheel will cause:

Vibration

Clutch dragging

Driven disc damage

All of the above

Correct! Wrong!

Ceramic clutch discs engage more aggressively than organic.

True

False

Correct! Wrong!

A 14 inch clutch uses a ___________ type flywheel:

Pot

Flat

Concave

Convex

Correct! Wrong!

If a clutch were adjusted so that the clearance between the release bearing and the clutch brake were to be reduced to 3/8, instead of 1/2" of an inch the clutch would:

Slip

Not fully release

Vibrate

Destroy the release bearing

Correct! Wrong!

When checking flywheel run out of a vehicle normally equipped with a pull type clutch, before taking each indicator reading, you must:

Set the gauge to the required clearance and reset the dial

Pry the crankshaft back against the crankshaft thrust washers

Pry the crankshaft to the side with the least amount of clearance

All of the above

Correct! Wrong!

Anti-rattle springs are used to:

Increase the harmonic vibrations created by the intermediate disc contacting the drive lugs

Reduce the noise and wear between the intermediate disc and drive lugs

Balance the clutch assembly

All of the above

Correct! Wrong!

To increase the amount of free pedal in a clutch assembly with a non synchromesh transmission, incorporating a clutch brake, a technician should:

Rotate the internal adjustment ring clockwise

Rotate the internal adjustment ring counterclockwise

Adjust the clutch linkage

Check and adjust the clutch brake

Correct! Wrong!

The purpose of the torsional springs in a clutch disc is to:

Allow the disc to flex

Allow for heat expansion of the disc

Absorb shock loads produced by acceleration and engine pulsations

Act as a friction improver

Correct! Wrong!

The correct amount of clutch brake action would be indicated by the clutch pedal being ___________inch(es) off the floor when the clutch brake starts contacting.

1/4

1

2

3

Correct! Wrong!

The correct amount of free pedal remaining with a properly adjusted clutch would be approximately __________ inches:

2

3

4

5

Correct! Wrong!

If a clutch is adjusted leaving excessive free play, this may result in:

Clutch slipping

Clutch not fully releasing

Clutch chattering

Vibration

Correct! Wrong!

If there is insufficient pedal free play when a clutch is readjusted, this may result in:

Clutch slipping

Clutch not fully releasing

Clutch chattering

Vibration

Correct! Wrong!

Insufficient pedal free play on a pull type clutch may also result in:

Premature crankshaft main bearing failure

Premature crankshaft rod bearing failure

Premature crankshaft thrust bearing failure

Premature oil pump failure

Correct! Wrong!

Insufficient clutch brake adjustment or a faulty clutch brake would result in:

Difficult shifting between gears while travelling on the highway

Difficulty in shifting into a gear while stopped-grinding

Clutch vibration

All of the above

Correct! Wrong!

An operator complains that he is having difficulty when shifting into gear when stopped and in shifting gears on the highway. The vehicle seems to want to creep ahead when the unit is in gear with the engine running and the clutch depressed. What may be the problem?

Seized release bearing

Seized pilot bearing

Seized crankshaft thrust bearings

Too little clutch freeplay

Correct! Wrong!

The pilot bearing should be changed whenever the clutch is replaced.

True

False

Correct! Wrong!

When installing a new clutch, an input shaft-like tool is used to:

Align the center disc to the clutch cover

Align the clutch discs to the center disc

Align the clutch cover to the pilot bearing

Align the clutch set to the pilot bearing

Correct! Wrong!

On a twin-disc, pull-type clutch, when releasing or disengaging the clutch, the throw-out bearing moves toward the:

Engine

Transmission

Pressure plate

Clutch discs

Correct! Wrong!

A damaged pilot bearing may cause a rattling or growling noise when:

The engine is idling and the clutch pedal is fully depressed and clutch released

The vehicle is decelerating in high gear with the clutch pedal released and clutch engaged

The vehicle is accelerating in low gear with the clutch pedal released and clutch engaged

The engine is idling, the transmission is in neutral, and the clutch pedal is released and clutch engaged.

Correct! Wrong!

Clutch slippage may be caused by:

a worn or rough clutch release bearing.

excessive input shaft and play.

a leaking rear main seal.

weak or broken torsional springs.

Correct! Wrong!

When measuring flywheel bell housing runout, what should the technician do first?

Attach a dial indicator to the flywheel

Attach a dial indicator on the shaft into the pilot bearing

Attach a dial indicator to the input shaft

Attach a dial indicator to the clutch housing

Correct! Wrong!

Signs of flywheel housing to transmission mating surface wear are:

A smooth dull surface texture change

Gouges or other abrupt markings on the mating surface

Fine hairline imperfections in the surface

Pitted or additional light surface rust

Correct! Wrong!

A vehicle equipped with a hydraulically actuated clutch, the driver complains that with the clutch pedal pressed all the way to the floor, the transmission will not disengage and always feels the engine trying to transmit power, and that he has to repeatedly shutdown and restart the vehicle in gear. The technician has checked the fluid in the clutch master cylinder reservoir and found it to be above the minimum mark and has no signs of leakage. The LEAST likely cause would be:

Poorly adjusted or disconnected linkage

Poor adjusting of the link from the hydraulic slave cylinder

Seized pilot bearing

Worn clutch disc

Correct! Wrong!

On a vehicle with a hydraulic clutch, the following components are all in the system EXCEPT:

The master cylinder

Metal and flexible tubes

A slave cylinder

A clutch cable

Correct! Wrong!

When inspecting the flywheel for wear, which is the LEAST likely to be included in that inspection?

The mating surfaces on the crankshaft and the back of the flywheel

The input shaft bearing

The ring gear

The mounting holes for the clutch assembly

Correct! Wrong!

When changing a flywheel ring gear, the steps that should be taken are:

Cool the ring gear in a freezer overnight

Heat the ring gear in an oven to the recommended temperature

Cool the ring gear and heat the flywheel

Heat the ring gear and cool the flywheel

Correct! Wrong!

To make transmission input shaft installation easy and to avoid any possible damage to clutch plates, you should use:

Special pull-in bolts

A clutch shaft pilot tool

A dial indicator and extension

An alignment rigging for the release bearing

Correct! Wrong!

When removing the cover bolts from the flywheel of a pull type clutch, you should first:

Disconnect the lubrication lines

Blow out any dust or contamination

Place wooden blocks under the release bearing

Steam clean the assembly

Correct! Wrong!

When there is no clutch pedal free travel, the result may be:

Clutch chatter

Vibration

Clutch slippage

Noisy operation

Correct! Wrong!

The clutch that operates in a manner similar to a rear axle brake system is the:

Expanding shoe or centrifical clutch

Contracting band clutch

Jaw clutch

Single disc clutch

Correct! Wrong!

To reduce torsional vibrations, some clutches will use:

Hydraulic shock absorbers

Application springs

A flexible hub with springs

Plastic insulators

Correct! Wrong!

If the clutch brake clearance adjustment is properly set, this should result in a clearance from the pedal to the firewall of approximately:

Too little free play

Worn splines on the input shaft

Faulty release bearing

Faulty input shaft bearing

Correct! Wrong!

If the clutch brake clearance adjustment is properly set this should result in a clearance from the pedal to the firewall of approximately:

1/4 inch

1/2 inch

1 inch

1 1/2 inches

Correct! Wrong!

On a hydraulically actuated push clutch system, if the clutch linkage to the master cylinder is adjusted too long, what may be the result?

Clutch slipping

Clutch not fully releasing

Too much freeplay

Excessive pedal effort

Correct! Wrong!

A bearing noise is heard only when the engine is running, transmission is in gear and the clutch pedal is depressed. What might be the problem?

Rear main bearing

Release bearing

Input shaft bearing

Countershaft bearing

Correct! Wrong!

As the plate(s) of a pull-type clutch wear:

The release bearing moves toward the fork

The release bearing moves away from the fork

The clutch brake will not perform as well

Free pedal will increase

Correct! Wrong!

When the face of a pot type pressure plate is resurfaced, what else needs resurfacing?

The pilot bearing bore

The pilot bearing face

The clutch cover mounting flange

There is no need to resurface anything else

Correct! Wrong!

The primary purpose of the clutch is to:

Which of the following clutch components is a driven member?

When the clutch disc turns the input shaft also turns.

Changing the pressure plate ring adjustment (internal adjustment) will affect the amount of clutch brake.

A vehicle owner complains that he has clutch brake but NO free play, which adjustment requires attention?

Which of the following driving procedures will likely result in clutch damage?

Upon a visual inspection, a mechanic finds that the clutch driven discs have several cracks near the center hub. This would be an indication that:

On a 14 inch pot style clutch, misaligned center disc drive lugs will usually result in:

A warped or distorted flywheel will cause:

Ceramic clutch discs engage more aggressively than organic.

A 14 inch clutch uses a ___________ type flywheel:

If a clutch were adjusted so that the clearance between the release bearing and the clutch brake were to be reduced to 3/8, instead of 1/2" of an inch the clutch would:

When checking flywheel run out of a vehicle normally equipped with a pull type clutch, before taking each indicator reading, you must:

Anti-rattle springs are used to:

To increase the amount of free pedal in a clutch assembly with a non synchromesh transmission, incorporating a clutch brake, a technician should:

The purpose of the torsional springs in a clutch disc is to:

The correct amount of clutch brake action would be indicated by the clutch pedal being ___________inch(es) off the floor when the clutch brake starts contacting.

The correct amount of free pedal remaining with a properly adjusted clutch would be approximately __________ inches:

If a clutch is adjusted leaving excessive free play, this may result in:

If there is insufficient pedal free play when a clutch is readjusted, this may result in:

Insufficient pedal free play on a pull type clutch may also result in:

Insufficient clutch brake adjustment or a faulty clutch brake would result in:

An operator complains that he is having difficulty when shifting into gear when stopped and in shifting gears on the highway. The vehicle seems to want to creep ahead when the unit is in gear with the engine running and the clutch depressed. What may be the problem?

The pilot bearing should be changed whenever the clutch is replaced.

When installing a new clutch, an input shaft-like tool is used to:

On a twin-disc, pull-type clutch, when releasing or disengaging the clutch, the throw-out bearing moves toward the:

A damaged pilot bearing may cause a rattling or growling noise when:

Clutch slippage may be caused by:

When measuring flywheel bell housing runout, what should the technician do first?

Signs of flywheel housing to transmission mating surface wear are:

On a vehicle with a hydraulic clutch, the following components are all in the system EXCEPT:

When inspecting the flywheel for wear, which is the LEAST likely to be included in that inspection?

When changing a flywheel ring gear, the steps that should be taken are:

To make transmission input shaft installation easy and to avoid any possible damage to clutch plates, you should use:

When removing the cover bolts from the flywheel of a pull type clutch, you should first:

When there is no clutch pedal free travel, the result may be:

The clutch that operates in a manner similar to a rear axle brake system is the:

To reduce torsional vibrations, some clutches will use:

If the clutch brake clearance adjustment is properly set, this should result in a clearance from the pedal to the firewall of approximately:

If the clutch brake clearance adjustment is properly set this should result in a clearance from the pedal to the firewall of approximately:

On a hydraulically actuated push clutch system, if the clutch linkage to the master cylinder is adjusted too long, what may be the result?

A bearing noise is heard only when the engine is running, transmission is in gear and the clutch pedal is depressed. What might be the problem?

As the plate(s) of a pull-type clutch wear:

When the face of a pot type pressure plate is resurfaced, what else needs resurfacing?

Success!

Heavy-Duty Mechanic - Trucks & Equipment