AUMT1416SEC2

On an integral wheel bearing hub assembly that is bolted to the steering knuckle, the maximum allowable endplay is:

0.005 inch

When measuring lateral wheel runout with the tire demounted from the wheel, the maximum runout on most automotive wheels is:

0.045 in

What is the maximum speed rating for a T rated tire?

118 mph

The tread wear indicator bar becomes visible when tread depth is less than?

2/32 inch

Tire pressure monitoring systems (TPMS) became required equipment on all vehicles sold in the United States beginning with what model year?

2008

Technician A says the repairable area in a tire is the width of the tread belts. Technician B says a tire puncture one-half inch in diameter is repairable. Who is correct?

A only

The customer complains of a "whining noise" in the back of her rear-wheel-drive car when driving between 30 and 40 miles per hour. Technician A says a good way to diagnose this problem is on a hoist with a stethoscope. Technician B says a good way to diagnose this problem is on the road with a microphone. Who is correct?

A only

Upon inspecting a noisy front wheel bearing from a 4WD sport utility vehicle, brinelling damage to the outer bearing race was noticed. Technician A says the damage was probably caused by tightening the bearing nut with an impact wrench. Technician B says the damage was probably caused by driving the vehicle through deep, muddy water. Who is correct?

A only

While discussing bearing defects: Technician A says misalignment wear on a front wheel bearing could be caused by a metal burr behind one of the bearing races. Technician B says misalignment wear on a front wheel bearing could be caused by a bent front spindle. Who is correct?

A only

While discussing defective bearings: Technician A says brinelling appears as indentations across the bearing races. Technician B says brinelling occurs while the bearing is rotating. Who is correct?

A only

While discussing front wheel bearing service on a vehicle with the bearing hub unit pressed into the steering knuckle: Technician A says the front wheel bearings may be damaged if this front-wheel-drive vehicle is moved without the hub nuts torqued to specifications. Technician B says the hub nut torque supplies the correct wheel bearing adjustment. Who is correct?

A only

While inspecting and servicing wheel hub seals:

A spring-loaded seal helps compensate for wheel hub bore eccentricity.

A rear-wheel hub contains two tapered roller bearings on a front-wheel-drive car. This type of wheel hub has:

An adjusting nut to adjust the wheel bearing endplay.

A customer says the new tires he just purchased vibrate. The installer says he balanced the wheels and tires with a conventional electronic balancer before placing them on the car. Technician A says one of the tires may have a conicity problem. Technician B says one of the tires may have a force variation problem. Who is correct?

B only

A customer says there is a "thumping" vibration in the wheels and an inspection of the tires shows the two front wheels have flat spots on the tire treads. Technician A says heavy spots in the tires may have caused this condition. Technician B says locking the wheels and skidding on pavement caused this condition. Who is correct?

B only

While discussing a vehicle that pulls to one side: Technician A says that excessive radial runout on the right front tire may cause this problem. Technician B says that tire conicity may be the cause of this complaint. Who is correct?

B only

While discussing on-car wheel balancing: Technician A says that during an on-car wheel balancing procedure on a rear wheel of a rear-wheel-drive car, the speed indicated on the speedometer should not exceed 65 (105 km/h). Technician B says that the speed indicated on the speedometer on this car must not exceed 35 mph (56 km/h). Who is correct?

B only

After a set of radial tires is rotated, the customer returns saying he feels vibration and steering shimmy. To correct this problem, you should:

Balance the tires and wheels with an on-car balancer.

A front-wheel-drive vehicle has 14-in. (35.5-cm) rims and front wheel bearings mounted in the steering knuckles. The vehicle is lifted on a hoist, and a dial indicator is positioned against the outer rim lip. The total inward and outward rim movement is 0.035 in (0.889 mm). Technician A says that the wheel bearing may require replacement. Technician B says that the hub nut torque should be checked prior to bearing replacement. Who is correct?

Both A and B

Not Answered 10. Not Answered Question Workspace While discussing front wheel bearing service on a front-wheel-drive car with two separate tapered roller bearings mounted in the front steering knuckles: Technician A says the hub nut torque supplies the correct bearing adjustment. Technician B says that the brake should be applied while the front hub nuts are torqued. Who is correct?

Both A and B

Technician A says a bearing cage may be called a separator. Technician B says needle roller bearings are designed to carry radial loads. Who is correct?

Both A and B

Technician A says excessive front wheel bearing endplay may cause steering wander. Technician B says a defective front wheel bearing may cause a growling noise while cornering. Who is correct?

Both A and B

Technician A says lateral wheel shimmy may be caused by dynamic wheel imbalance. Technician B says dynamic wheel imbalance may cause tire thumping. Who is correct?

Both A and B

Technician A says radial tires have the ply cords positioned at a right angle in relation to the tire centerline. Technician B says that if radial tires are filled with nitrogen, the inflation pressure remains more stable over a longer period of time. Who is correct?

Both A and B

The owner of a rear-wheel-drive car with aftermarket alloy wheels says he has replaced the wheel bearings three times in the past two years. He wants to know why the bearings fail. Technician A says excessive radial runout of the wheel may be the cause of the problem. Technician B says excessive offset of the wheel may be the cause of the problem. Who is correct?

Both A and B

While discussing a tire thumping problem: Technician A says this problem may be caused by cupped tire treads. Technician B says a heavy spot in the tire may cause this complaint. Who is correct?

Both A and B

While discussing the cause of overheating damage of a front wheel bearing: Technician A says overheating may be caused by insufficient or incorrect bearing lubricant. Technician B says overheating may be caused by overtightening the wheel bearing nut on installation. Who is correct?

Both A and B

While discussing tire noise: Technician A says if it is tire noise the noise will vary with road surface conditions. Technician B says that if it is tire noise the noise will remain constant when the vehicle is accelerated and decelerated. Who is correct?

Both A and B

Static wheel unbalance causes:

Cupped tire wear

A tapered roller bearing has

Excellent ability to carry radial, thrust, and angular loads.

A customer returns with recently purchased radial tires saying that the rear of the car feels like "it's riding on Jello™." All of the following could cause this problem EXCEPT: a. The radial belt of a rear tire is not straight. b. The wheel is improperly mounted. c. Excessive lateral wheel runout. d. Excessive radial tire runout.

Excessive Radial Runout

T/F A defective inner drive axle joint produces a clicking noise when cornering at low speeds.

False

When installing replacement tires:

If the tire size is different than the original tire size, antilock brake system operation can be adversely affected.

Dynamic wheel unbalance can result in:

Increased steering effort

When diagnosing wheel balance problems:

Loose wheel bearing adjustment may simulate improper static wheel balance

Nitrogen tire inflation provides:

More stable tire pressure

While discussing tire wear: Technician A says that static imbalance causes feathered tread wear. Technician B says that dynamic imbalance causes cupped wear and bald spots on the tire tread. Who is correct?

Neither A nor B

A spring-loaded seal compensates for all of these conditions EXCEPT: a. Seal lip wear. b. Shaft movement. c. Bore eccentricity. d. Wear on the seal bore.

On some rear wheel bearings, a threaded adapter ring retains the bearing on the axle shaft.

The outside of the wheel should be facing _______________ when using the bead breaker and _______________ when placed on the tire machine.

Out, Up

What are the actions needed before mounting the wheel on the tire machine?

Remove valve cap, remove valve core, break bead from rim

A unitized front wheel bearing hub that is bolted to the steering knuckle has 0.010 in (0.254 mm) of hub endplay. The proper repair procedure is to:

Replace the wheel bearing hub assembly.

When inspecting and servicing front wheel bearings on front-wheel-drive cars:

Some one-piece front wheel bearing hubs are bolted to the front strut.

When inspecting and servicing bearings:

Some rear-wheel-drive vehicles have rear-axle bearings that are sealed on both sides.

When a tire has a conicity problem:

The tire is cone shaped and not level across the tread area.

T/F A bearings may overheat if the wheel bearing-adjusting nut is not adjusted properly to provide the correct bearing preload.

True

T/F Some run-flat tires have sidewall reinforcements.

True

T/F Tapered roller bearings and their matching inner races must be replaced as a set.

True

A front tire has excessive wear on both edges of the tire tread. The most likely cause of this problem is:

Underinflation

Which of the following conditions would require the replacement of the tire? a. Extreme tire wear b. Puncture in sidewall c. Nail puncture in tread d. Either B or C

a. Extreme tire wear

The customer says her front-wheel-drive car makes "a moaning noise" in a turn. Which of the following could cause this problem? a. Outer front wheel bearing. b. Rear-axle bearing. c. Differential gear noise. d. Transaxle output shaft bearing.

a. Outer front wheel bearing

A front-wheel-drive vehicle has two serviceable tapered roller bearings in each rear wheel hub. Which of the following statements about adjusting these wheel bearings is correct? a. The adjusting nut should be tightened to 17 to 25 ft.-lb (23 to 24 Nm), backed off 1/2 turn, and then tightened to 10 to 15 in.-lb (1.0 to 1.7 Nm). b. The adjusting nut should be tightened to 40 ft.-lb (54 Nm), backed off 1 turn, and then tightened to 10 ft.-lb (13.5 Nm). c. The adjusting nut should be tightened to 50 ft.-lb (67.5 Nm), backed off 3/4 turn, and then tightened to 10 to 15 in.-lb (1.0 to 1.7 Nm). d. The wheel and hub should not be rotated while adjusting the wheel bearings.

a. The adjusting nut should be tightened to 17 to 25 ft.-lb (23 to 24 Nm), backed off 1/2 turn, and then tightened to 10 to 15 in.-lb (1.0 to 1.7 Nm).

All of these statements about bearings are true EXCEPT: a. Tapered roller bearings have excellent capability to carry radial, thrust, and angular loads. b. Ball bearings are used in most wheel bearings. c. A roller bearing has rollers with the same diameter at each end. d. In a tapered roller bearing, the openings in the separator grooves match the curvature of the rollers.

b. Ball bearings are used in most wheel bearings

All of these statements about improper wheel balance are true EXCEPT: a. Dynamic imbalance may cause wheel shimmy. b. Dynamic imbalance may cause steering pull in either direction. c. Static imbalance causes wheel tramp. d. Static imbalance causes rapid wear on suspension components.

b. Dynamic imbalance may cause steering pull in either direction

All of the following statements are correct EXCEPT: a. Greases are named for their thickening agent. b. NLGI sets the standards for testing greases. c. The prefix GC is the highest designation for automotive wheel bearing greases. d. The prefix LB is the highest designation for automotive wheel chassis greases.

b. NLGI sets the standards for testing greases

Which of the following statements about servicing press-in rear-axle bearings on a rear-wheel-drive car is correct? a. These bearings may be reused after they are removed from the axle shaft. b. The bearing adaptor ring should be removed by splitting it with a hammer and chisel. c. A cutting torch may be used to cut the bearing off the axle shaft. d. An acetylene torch may be used to heat the new adaptor ring prior to installation.

b. The bearing adaptor ring should be removed by splitting it with a hammer and chisel.

Which of the following statements about wheel bearings is correct? a. Sealed bearings should be washed in solvent. b. High-pressure air may be used to spin the bearings. c. A bent bearing cage may be caused by improper tool use. d. Bearing overload may cause bearing cage wear.

c. A bent bearing cage may be caused by improper tool use.

Which of the following should you do when servicing tapered roller-type wheel bearings? a. Reinstall the old hub seal b. Spin the bearings with compressed air c. Clean, inspect, and repack the bearings d. Leave metal burrs in the hub seal recess

c. Clean, inspect, and repack the bearings

All of the following statements about rim offset are correct EXCEPT: a. Zero offset, the rims centerline aligns with the mounting face of the rim. b. Positive offset, the rim centerline is inboard of the mounting face of the rim. c. Positive offset, the centerline is outboard of the mounting face of the rim. d. Negative offset, the centerline is outboard of the mounting face of the rim.

c. Positive offset, the centerline is outboard of the mounting face of the rim

The Uniform Tire Quality Grading (UTQG) system provides consumers with useful information to help them purchase tires based on all of the following EXCEPT: a. Temperature Rating b. Traction Rating c. Speed Rating d. Tread wear rating

c. Speed Rating

The customer says her front-wheel-drive car has a noise and vibration when decelerating and is most noticeable under 50 miles per hour. Which would be the most probable cause of this problem? a. Defective outer front wheel bearing. b. Defective inner front wheel bearing. c. Defective outer drive axle joint. d. Defective inner drive axle joint.

d. Defective inner drive axle joint

All these statements about hub seal service are true EXCEPT: a. The garter spring must face toward the flow of lubricant. b. A ball peen hammer should be used to install the seal. c. Seal contact area on the spindle must be clean and free from metal burrs. d. The outer edge of the seal case should be coated with sealant.

d. The outer edge of the seal case should be coated with sealant

A spring-loaded seal compensates for all of these conditions EXCEPT: a. Seal lip wear. b. Shaft movement. c. Bore eccentricity. d. Wear on the seal bore.

d. Wear on the seal bore

A springless seal may be used to seal a ______ lubricant into a hub.

heavy

When a vehicle is turning a corner, the front wheel bearings must carry a _________ load.

horizontal

When two separate tapered roller bearings are located in a front steering knuckle on a front-wheel-drive car, the wheel bearing endplay adjustment is provided by:

hub nut torque

What safety precautions should be followed when removing the valve core?

keep face away from escaping air

A ball bearing is designed primarily to withstand _____ loads.

radial

What is the last step in dismounting the tire from the wheel?

remove the valve assembly