Chapter 31 The Clutch System

Crankshaft ________ is the amount of forward and rearward movement of the crankshaft and must be within the manufacturer's specifications for the vehicle. Select one: a. Runout b. End play c. Free play d. All of the above

End play

A potentiometer can be used to measure crankshaft end play at the end of the crankshaft. Select one: True False

False

If the step of a flywheel is not deep enough, the pressure plate will not develop enough clamping force to keep the clutch from slipping. Select one: True False

False

The pressure of the hydraulic fluid can be used to supply the pressure to push fluid and air out of the clutch hydraulic system when gravity bleeding. Select one: True False

False

In most cases, the hydraulic clutch operating system automatically compensates for clutch disc wear. Select one: True False

True

Increasing the spring force of the pressure plate that clamps the clutch disc to the flywheel increases torque capacity but takes more foot pressure to operate the clutch pedal. Select one: True False

True

The automotive technician should check that all hydraulic lines are not kinked or leaking at their connection points. Select one: True False

True

The clutch plays the role of engaging and disengaging the input shaft, so the input shaft speed can be changed as needed. Select one: True False

True

The pressure bleeding method works well for hydraulic clutch systems that tend to trap air in the hydraulic system that cannot be bled manually. Select one: True False

True

When a vehicle's flywheel is removed, it is a good practice to inspect the rear of the engine block for any damage to the mating surfaces and alignment dowels. Select one: True False

True

________ bleeding uses gravity to push fluid and air from the master cylinder and lines out through the slave cylinder bleeder screw. Select one: a. Gravity b. Manual c. Pressure d. Vacuum

a. Gravity

Which of the following can be done to increase the torque-carrying capacity of a clutch? Select one: a. Increase the diameter of the disc and pressure plate. b. Decrease the coefficient of friction of the disc faces. c. Increase the clutch free play. d. Decrease the spring clamping force.

a. Increase the diameter of the disc and pressure plate.

Two technicians are discussing clutch free play. Tech A says an adjustment on the clutch cable provides for the specified amount of free play to be maintained between the throw-out bearing and the pressure plate levers when the clutch pedal is in the released position. Tech B says the free play causes constant contact of the bearing with the pressure plate levers and subsequent rotation of the bearing when the engine is running. Who is correct? Select one: a. Tech A b. Tech B c. Both Techs A and B d. Neither Tech A nor B

a. Tech A

While preparing a manual transmission/transaxle to be reinstalled, Tech A says the input shaft splines should be lightly lubricated to prevent binding during assembly. Tech B says the components should be assembled totally dry, as there is too much risk of lubricant getting onto the disc faces. Who is correct? Select one: a. Tech A b. Tech B c. Both Techs A and B d. Neither Tech A nor B

a. Tech A

While the flywheel is removed during clutch replacement, Tech A says to check all plugs and oil seals on the rear of the engine block. Tech B says that a full-circle rear main seal should be replaced without removing the flywheel. Who is correct? Select one: a. Tech A b. Tech B c. Both Techs A and B d. Neither Tech A nor B

a. Tech A

Technician A says a diaphragm-type pressure plate requires less pedal effort to operate than a coil spring type. Technician B says a clutch with a coil spring type pressure plate uses one large spring to create the clamping force. Who is correct? Select one: a. Technician A b. Technician B c. Both Technician A and Technician B d. Neither Technician A nor Technician B

a. Technician A

Two technicians are discussing clutch free play. Technician A says an adjustment on the clutch cable provides for the specified amount of free play when the clutch pedal is in the released position. Technician B says free play is only present when the engine is running. Who is correct? Select one: a. Technician A b. Technician B c. Both Technician A and Technician B d. Neither Technician A nor Technician B

a. Technician A

With an internal type of hydraulic clutch, which part operates the throw-out bearing? Select one: a. The slave cylinder b. The clutch fork c. The master cylinder pushrod d. The pressure plate

a. The slave cylinder

Continuing to drive a vehicle with insufficient clutch pedal free play would likely result in: Select one: a. premature failure of the clutch assembly. b. excessive wear on the pilot bushing. c. clutch hydraulic cylinder failure. d. excessive wear on the transmission input shaft.

a. premature failure of the clutch assembly.

Which of the following should be used to measure the runout of a flywheel? Select one: a. A straight edge and feeler blades b. A dial indicator c. A flywheel wrench d. A torque wrench

b. A dial indicator

The torque of the output shaft is ________, allowing the vehicle to travel at higher speeds without over-revving the engine. Select one: a. Lessened with each lower gear b. Lessened with each higher gear c. Increased with each higher gear d. None of the above

b. Lessened with each higher gear

The ________ bleeding method of bleeding a clutch hydraulic system uses the master cylinder to push fluid and air from the system. Select one: a. Gravity b. Manual c. Pressure d. Vacuum

b. Manual

Tech A says that too little clutch pedal free play can cause hard shifting and greater grinding. Tech B says to too much can cause hard shifting and gear grinding.

b. tech B

Older technology systems used a series of levers with an equalizing mechanism called a ________ that rotated and was attached to the engine and the vehicle frame. Select one: a. Bell crank b. Equalizer bar c. Both A and B d. Neither A nor B

c. Both A and B

Tech A says that the flywheel runout can be checked with a dial indicator. Tech B says that when checking flywheel runout, it is good practice to also check crankshaft end play. Who is correct? Select one: a. Tech A b. Tech B c. Both A and B d. Neither A nor B

c. Both A and B

Technician A says a clutch having a collar-style slave cylinder will not have a fork. Technician B says most hydraulic clutches do not normally require periodic free play adjustment. Who is correct? Select one: a. Technician A b. Technician B c. Both Technician A and Technician B d. Neither Technician A nor Technician B

c. Both Technician A and Technician B

Technician A says clutch slippage can best be diagnosed with the vehicle stopped, parking brake applied, placing the transmission in 4th gear, and slowly releasing the clutch pedal to see if it stalls the engine. Technician B says an excessively slipping clutch can cause friction surface warpage or hot spots. Who is correct? Select one: a. Technician A b. Technician B c. Both Technician A and Technician B d. Neither Technician A nor Technician B

c. Both Technician A and Technician B

Technician A says that one advantage of using a multi-plate clutch is increased torque capacity. Technician B says that one advantage of a multi-plate disc is that there is no increase in pedal effort. Who is correct? Select one: a. Technician A b. Technician B c. Both Technician A and Technician B d. Neither Technician A nor Technician B

c. Both Technician A and Technician B

A vehicle has clutch pedal pulsation whenever the pedal is applied. Tech A says the pulsation may be the result of clutch abuse and overheating. Tech B says the cause may be lever misalignment in the pressure plate. Who is correct? Select one: a. Tech A b. Tech B c. Both Techs A and B d. Neither Tech A nor B

c. Both Techs A and B

Tech A says a clutch having a collar-style slave cylinder will not have a fork. Tech B says most hydraulic clutches do not normally require periodic free play adjustment. Who is correct? Select one: a. Tech A b. Tech B c. Both Techs A and B d. Neither Tech A nor B

c. Both Techs A and B

Tech A says the clutch makes it possible to connect and disconnect the input shaft from the engines flywheel. Tech B says the drive wheels are in constant mesh with the output shaft and cannot be disconnected. Who is correct? Select one: a. Tech A b. Tech B c. Both Techs A and B d. Neither Tech A nor B

c. Both Techs A and B

The inner workings of the _________ helps absorb engine vibrations, thus minimizing gear rattle and putting less strain on the drivetrain components. Select one: a. Flywheel ring gear b. Single one-piece flywheel c. Dual mass flywheel d. Planetary gearing flywheel

c. Dual mass flywheel

Flywheel ________ can be measured with a dial indicator. Select one: a. Free play b. End play c. Runout d. None of the above

c. Runout

If the clutch pedal is ________, the technician should perform some preliminary checks, such as checking the level of fluid in the hydraulic clutch master cylinder, before test-driving the vehicle. Select one: a. Worn b. Rigid c. Spongy d. Resistant

c. Spongy

In a hydraulically operated clutch, all of the following statements are true, EXCEPT: Select one: a. Most hydraulic clutches are self-adjusting. b. The slave cylinder is located on the outside of the bell housing or on the inside of the transmission bell housing. c. The master cylinder is connected directly to the clutch fork. d. The slave cylinder may be mounted directly behind the throw-out bearing.

c. The master cylinder is connected directly to the clutch fork.

Torsional type clutch vibrations may be caused by any of the following, EXCEPT: Select one: a. an out of balance clutch disc b. an out of balance flywheel c. an out of balance driveshaft d. an out of balance vibration damper

c. an out of balance driveshaft

When performing a clutch inspection, the operation of the clutch pedal and return springs should be checked for ________. Select one: a. pedal height b. obstruction c. binding d. gear clash

c. binding

As the clutch wears, the friction disc becomes: Select one: a. redundant. b. thicker. c. thinner. d. heavier.

c. thinner.

In a dry friction type of clutch, the total amount of friction depends on: Select one: a. the coefficient of friction of the disc facings. b. the diameter of the clutch. c. the total spring clamping force of the pressure plate. d. All of the above

d. All of the above

One advantage of using a multi-plate clutch is increased torque capacity. Another advantage of this design is: Select one: a. no increase in spring pressure is needed. b. no increase in diameter is needed. c. no increase in pedal effort will occur. d. All of the above

d. All of the above

When a vehicle's clutch is being replaced, the flywheel should be inspected for _______. Select one: a. Bluing b. Hot spots c. Cracks d. All of the above

d. All of the above

What are the two most common pressure plate designs? Select one: a. Viscous and coil spring b. Diaphragm and floating disc c. Dual mass and diaphragm d. Diaphragm and coil spring

d. Diaphragm and coil spring

It is important to check the clutch linkage mechanism for proper operation and correct the adjustment (________) periodically. Select one: a. Grind b. Clash c. Alignment d. Free play

d. Free play

In __________, the clutch pedal acts on a master cylinder connected by a hydraulic tube and flexible hose to a slave cylinder mounted on (external type) or in (internal type) the transmission bell housing. Select one: a. Lever-operated systems b. Cable mechanisms c. Cable-operated clutch control systems d. Hydraulic clutch release mechanisms

d. Hydraulic clutch release mechanisms

a clutch is chattering the trans gear lube is low. Tech A says the most likely cause is uneven on the flywheel. Tech B says the motor mounts are worn out. who is correct? a. Tech A b. Tech B c. Both D. neither

d. neither