AUT-128 final exam
Four-wheel drive operation modes are being discussed. Technician A says 4-low, as compared to 4-high, increases wheel torque. Technician B says 2-low is available on most 4WD vehicles. Who is correct?
a only
Technician A loosens the CV joint axle nut using a breaker bar with the wheels on the ground and an assistant holding pressure on the brake pedal. Technician B uses an impact wrench. Who is correct?
a only
Technician A says broken or worn engine and transaxle mounts can cause a transaxle to have shifting problems. Technician B says poor shift boot alignment cannot cause a transaxle to jump out of gear. Who is correct?
a only
Technician A says in a conventional transmission, the speed gears freewheel around the main shaft until they are locked to it by the synchronizer. Technician B says when not engaged, speed gears slide away from the counter gears until they are no longer in mesh. Who is correct?
a only
Technician A says on-demand 4WD systems are controlled by the PCM/TCM. Technician B says when slip is detected at the rear wheels, the duty cycle to the output clutch at the transfer case is decreased. Who is correct?
a only
Technician A says the speeds at which two meshed gears turn depend on the number of teeth on each gear. Technician B says if the driving gear has fewer teeth than the driven gear, the speed of the driven gear increases. Who is correct?
a only
CV joints provide ______.
all answers correct
Hard shifting may be caused by _____.
all answers correct
If a drive axle shows signs of rubbing against the chassis, the vehicle should be checked for ______.
all answers correct
Helical gears are being discussed. Technician A says helical gears are used in modern transmissions because they don't produce axial thrust. Technician B says in a helical gearset two or more teeth mesh at the same time, which distributes tooth load and produces a very strong gear. Who is correct?
b only
Technician A says hard shifting in all gears may be caused by a single worn synchronizer assembly. Technician B says hard shifting in all gears may be caused by incorrect clutch linkage adjustment. Who is correct?
b only
Technician A says the transmission allows the driven wheels to spin faster than the engine. Technician B says the transmission multiplies the torque produced by the engine. Who is correct?
b only
Driveshaft speed variation is being discussed. Technician A says the speed variations at the transmission yoke end of the driveshaft are canceled out by the speed variations at the pinion flange end. Technician B says the operating angles at each end must be equal for the speed variations to cancel each other out. Who is correct?
both a and b
Front axle disconnect systems are being discussed. Technician A says the systems use a vacuum motor to disengage and engage the right side axle shaft from the differential. Technician A says an electric motor is used to engage and disengage the axle. Who is correct
both a and b
Which type of CV joint has a flat design?
cross groove
Front-engine RWD luxury-type vehicles often use a double U-joint arrangement called a ______.
double cardan type joint
The backup light switch is located _____.
both "on the transmission case" and "on the shifter linkage"
An excessively low lubricant level will most likely cause ______.
gear lockup and seizure
If a threaded area in an aluminum housing is damaged, a _____ insert can be used to restore the damaged threads.
helicoil
When the 1-2 shift rail is moved into first gear, the 3-4 and 5-R shift rails are prevented from moving by the ______.
interlock pin
Which of the following is not part of a synchronizer assembly?
interlock pin
A transmission is being assembled, but the main shaft and input shaft do not easily slide into their bores in the transmission case. Technician A installs the main shaft assembly into the case by tightening the extension housing retaining bolts. Technician B installs the input shaft by tightening the front bearing retainer bolts. Who is correct?
neither a nor b
Technician A says axles with a numerically high gear ratio such as 4.11 allow the engine to run slower at any given speed, resulting in better fuel conservation. Technician B says axles with numerically low gear ratio such as 2.83 allow for fast acceleration and good pulling power. Who is correct?
neither a nor b
Technician A says spur-cut gears have teeth cut at an angle. Technician B says spur-cut gears run without creating gear whine. Who is correct?
neither a nor b
A ring and pinion gearset that has ten teeth on the pinion gear and thirty teeth on the ring gear is a ______.
nonhunting gearset
What type of bearings should not be washed in solvent?
sealed ball bearings
The release bearing on a vehicle with a _____ is kept in contact with the release levers of the rotating pressure plate assembly. As a result, the release bearing rotates constantly with the pressure plate.
self adjusting clutch linkage
Which of the following is NOT a spring type used in pressure plate assemblies?
torsional
Which of the following is NOT one of the basic manual transmission shafts?
transfer shaft
Which type of joint is NOT a constant velocity type joint?
u-joint
Technician A says an overdrive gear ratio is less than 1 to 1. Technician B says overdrive ratios provide more torque than underdrive ratios. Who is correct?
A only
Technician A says the transfer case splits torque from the transmission to the front and rear axles. Technician B says viscous clutch units can be overhauled. Who is correct?
A only
What will happen if the manual locking hubs remain in the 4WD or locked position when the vehicle is driven in 2WD mode?
Both "fuel economy will be reduced" and "driveline noise will increase"
Two technicians are discussing the difference between 4WD and AWD. Technician A says AWD does not have an interaxle differential lockout. Technician B says AWD does not have a low range. Who is correct?
b only
While discussing transmission/transaxle rebuilding procedures, Technician A says shims located under bearing cups should always be replaced. Technician B keeps all shims and bearing races together and identified for reinstallation in their original location. Who is correct?
b only
Gold-colored particles in the transmission fluid are an indication of worn ______.
blocking rings
Pilot bearings are being discussed. Technician A says the pilot bearing supports one end of the input shaft. Technician B says the pilot bearing keeps the clutch disc centered in the pressure plate. Who is correct?
both a and b
Technician A says FWD axle shafts can be solid or tubular. Technician B says FWD axle shafts can be equal or unequal in length. Who is correct?
both a and b
Technician A says clutch linkage may be mechanically or hydraulically operated. Technician B says clutch linkage includes shaft and lever linkage and cable linkage designs. Who is correct?
both a and b
Technician A says in a full-time AWD transmission/transfer case, the hydraulic clutch that controls slippage in the 4WD system is controlled by inputs from the ABS wheel speed sensors. Technician B says some full-time AWD transfer cases can lock the differential so that the front and rear driveshafts must turn at the same speed. Who is correct?
both a and b
Technician A says the main gears are also called speed gears. Technician B says speed gears freewheel around the main shaft until they are locked to it by the engagement of their shift synchronizer unit. Who is correct?
both a and b
Technician A says the pressure plate assembly squeezes the clutch disc onto the flywheel. Technician B says the pressure plate moves away from the clutch disc so that the disc can stop rotating. Who is correct?
both a and b
Technician A says the transfer case uses a chain to transfer torque from the transmission to the front driveshaft. Technician B says the transfer case uses spur or helical cut gearsets to transfer torque to the front driveshaft. Who is correct?
both a and b
A(n) _____ gear is used to transfer motion without changing rotational direction.
idler
A gear ratio of 0.80:1 is a(n) _____ ratio.
overdrive
A collapsible pinion spacer is used to set the ______.
pinion bearing preload
Which CV joint test should be performed to determine whether the CV joint boot needs to be serviced?
squeeze test
C-shaped washers [C-locks] are used to retain the axle shaft used with _____ bearings.
straight roller
Which of the following may be reused when rebuilding a transmission?
synchronizer assemblies
Manual transaxle input shafts are typically supported by ______ bearings.
tapered roller