AUT-128 final exam
Which 4WD transfer case shift position should be used for climbing steep hills when driving off-road?
4-low
When making a clutch adjustment, it is necessary to ______.
measure clutch pedal free travel
In a five-speed manual transmission/transaxle, an idler gear is used for _____ gear.
reverse
Technician A says helical cut gears have teeth cut at a 90-degree angle to the side of the gear. Technician B says helical gears run without creating gear whine. Who is correct?
b only
An engine support fixture is used to hold the engine in place while removing a ______.
FWD transaxle
A rough growling noise occurs when the vehicle is moving and the transmission is in forward or reverse gears. The noise is not heard when the transmission is in neutral. Technician A says the output or main shaft bearings may be faulty. Technician B says the pilot bearing may be faulty. Who is correct?
a only
Fixed-tripod-type CV joints are being discussed. Technician A says the fixed tripod joint cannot be removed from the drive shaft or disassembled because of the way it is manufactured. Technician B says the fixed tripod joint has less angular capability than a Rzeppa-type joint. Who is correct?
a only
Technician A checks the engine and transmission mounts by running the engine at 1,500 rpm and with the park brake on lightly applying the clutch, while an assistant observers the movement of the engine and transmission. Technician B checks the mounts by applying 100 ft./lbs. of torque to the drive shaft with a torque wrench while measuring the movement of the engine with a dial indicator. Who is correct?
a only
Technician A says part-time 4WD vehicles do not have an interaxle differential. Technician B says part-time 4WD vehicles do not have a transfer case. Who is correct?
a only
Technician A says side bearing preload limits the amount of lateral movement to the differential case in the axle housing. Technician B says adjusting backlash sets the pinion gear depth. Who is correct?
a only
Viscous clutches are being discussed. Technician A says if the clutch malfunctions, it must be replaced. Technician B says viscous clutch fluid must be checked periodically. Who is correct
a only
Driveshafts are made of ______.
all answers are correct
The VSS [vehicle speed sensor] provides information for the ______.
all answers are correct
Transmission identification numbers often include the ______.
all answers are correct
Which of the following describes the double Cardan universal joint?
all answers are correct
Self-shifting manual transmissions are being discussed. Technician A says these transmissions use planetary gearsets and torque converters like conventional automatic transmissions. Technician B says these transmissions are manual transmissions that shift gears using a computer-controlled actuator connected to the shift forks and a clutch actuator. Who is correct?
b only
Technician A checks ball bearings by spin testing with an air blower. Technician B cleans and lubricates the bearings then spins them by hand while checking for roughness or vibration. Who is correct?
b only
Technician A says spinning bearings with compressed air is a good way to dry them. Technician B says spinning a bearing with air may cause it to be damaged. Who is correct?
b only
Technician A says the clutch fork moves the pilot bearing. Technician B says the clutch fork movement is controlled by the clutch pedal. Who is correct?
b only
Technician A says wheel bearings on 4WD vehicles are permanently sealed and lubricated and do not require disassembly and service after the hubs have been submerged in water. Technician B says a frequent cause of wheel bearing failure is the use of oversized tires mounted on wheels with substantial offset. Who is correct?
b only
In RWD applications with IRS, the ______ CV joint is a plunge type.
both "inboard" and "outboard"
The CV joints nearest the transaxle are called the ______ joints
both "inner" and "inboard"
A FWD vehicle that makes a clunking noise when the automatic transmission is shifted into gear is being diagnosed. Technician A says the problem could be excessive play in an inner or outer CV joint. Technician B says the noise could be produced by excessive backlash in the differential gears and transmission. Who is correct?
both a and b
Shifter linkages are being discussed. Technician A says the shifter interlock prevents the selection of more than one gear during shifting. Technician B says when one of the shift rails is moved by the shifter, the interlock pins hold the other shift rails in their neutral position. Who is correct?
both a and b
Technician A checks the condition of blocking rings by measuring the clearance between the blocking ring and the face of the gear. Technician B visually inspects the blocking ring for worn clutch teeth and smooth internal surfaces. Who is correct?
both a and b
Technician A checks the flywheel for runout [warpage] using a dial indicator. Technician B uses a straightedge to check the pressure plate for warpage. Who is correct?
both a and b
Technician A says an interaxle differential can lower performance in poor traction conditions. Technician B says many 4WD vehicles use an interaxle differential in the transfer case to eliminate driveline windup during turns. Who is correct?
both a and b
Technician A says some AWD systems have a center differential. Technician B says some AWD vehicles have a viscous clutch. Who is correct?
both a and b
Technician A says the clutch allows the engine to idle while the vehicle is stopped. Technician B says the clutch is needed for gear shifting. Who is correct?
both a and b
Technician A says the differential allows torque to be transmitted to the driving axles at different speeds when the vehicle is turning a corner. Technician B says the gear ratio of the drive axle's ring and pinion gears provide a gear reduction and torque multiplication. Who is correct ?
both a and b
Technician A says the front of the transmission input shaft may be supported by a pilot bearing. Technician B says on some transaxles the input shaft is not supported by a pilot bearing. Who is correct?
both a and b
Technician A uses a soft-face hammer to tap a bearing into its bore. Technician B uses a ball-peen hammer and brass drift. Who is correct?
both a and b
When fourth gear is selected on a five-speed manual transmission, the synchronizer couples the ______.
clutch [input] gear to the main shaft
Part-time 4WD is found on what type of vehicle?
full-size pickup truck
The double-offset joint is typically used in applications that require ______.
higher operating angles and greater plunge depth
Which of the following components is NOT part of a viscous clutch assembly?
hydraulic piston
When the yokes are in the same plane, the joints are said to be ______.
in phase
The Haldex clutch in the all-wheel drive automatic transaxle takes the place of the ______
interaxle differential
A mirrorlike shine on the pressure plate or a glazed clutch facing that results in chatter could be caused by ______.
liquid leaking onto the clutch
When the clutch pedal is released on a hydraulic clutch linkage, the ______
master cylinder piston is released by the piston return spring
Which of the following is NOT a function of gears?
multiply torque while increasing speed
A cyclic vibration that comes and goes between 45 and 60 mph (72 to 97 kph) is being discussed. Technician A says the problem may be caused by an out-of-balance tire and wheel. Technician B says the Rzeppa CV joint may be bad. Who is correct?
neither a nor b
Interaxle differentials are being discussed. Technician A says the interaxle differential is located inside the front axle housing. Technician B says the interaxle differential is located inside the rear axle housing. Who is correct?
neither a nor b
Technician A says when the left-side axle shaft on an FWD vehicle is longer than the right side, torque steer is reduced. Technician B says the torsional damper on the axle shaft automatically balances the shaft. Who is correct?
neither a nor b
While discussing different types of pressure plate assemblies, Technician A says coil spring types do not require release levers. Technician B says Belleville-type pressure plates are not commonly used because they require excessive space in the bellhousing. Who is correct?
neither a nor b
Insufficient clutch pedal clearance results in ______.
premature release bearing failure
The two driving members [inputs] of the clutch assembly are the flywheel and ______.
pressure plate
Which type of gear develops the problem of gear whine at higher speeds?
spur gear
Which of the following is NOT a function of the final drive in a rear axle?
transfers braking torque to the front wheels
What could cause transmission fluid to drip out of the transmission vent?
wrong type of transmission fluid
