Chapter 4
A tapered roller bearing has: a. Rollers that have the same diameter at both ends. b. Excellent ability to carry radial, thrust, and angular loads. c. Horizontal inner surfaces of the inner and outer races. d. A separator that allows the rollers to lightly contact each other.
b
All of the following statements are correct EXCEPT: a. Greases are named for their thickening agent. b. NLGI classifies gear lubricants. 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
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
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.
b
When inspecting and servicing rear wheel bearings on rear-wheel-drive cars: a. On some rear wheel bearings, a threaded adapter ring retains the bearing on the axle shaft. b. Roller-type rear-axle bearings may be lubricated from the oil supply in the differential. c. A GL-2 lubricant is recommended in hypoid type differentials. d. An SAE 50 gear oil is recommended in many differentials.
b
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 a 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
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 17-25 ft.-lb (23-24 Nm), backed off one-half turn, and then tightened to 10-15 in.-lb (1.0-1.7 Nm). b. The adjusting nut should be tightened to 40 ft.-lb (54 Nm), backed off one 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 three-quarter turn, and then tightened to 10-15 in.-lb (1.0-1.7 Nm). d. The wheel and hub should not be rotated while adjusting the wheel bearings.
a
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
Upon inspecting a noisy front wheel bearing from a four-wheel-drive 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. A only b. B only c. Both A and B d. Neither A nor B
a
When inspecting and servicing bearings: a. Some rear-wheel-drive vehicles have rear-axle bearings that are sealed on both sides. b. In a sealed bearing, the seal is usually attached to the inner race. c. Endplay adjustment is not critical on tapered roller bearings. d. A roller bearing can be removed by striking it with a steel hammer
a
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. A only b. B only c. Both A and B d. Neither A nor B
a
Greases are named for the thickening agent. All of the following are common greases EXCEPT: a. Lithium b. Sodium c. Teflon d. Aluminum
c
The customer complains of a "whining noise" in the back of her rear-wheel-drive car when driving between 30 and 40 mph. 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. A only b. B only c. Both A and B d. Neither A nor B
c
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: a. The bearing race position. b. Wheel nut torque. c. Hub nut torque. d. Wheel hub position.
c
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
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. A only b. B only c. Both A and B d. Neither A nor B
c
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? a. A only b. B only c. Both A and B d. Neither A nor B
c
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. A only b. B only c. Both A and B d. Neither A nor B
c
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? a. A only b. B only c. Both A and B d. Neither A nor B
c
While inspecting and servicing wheel hub seals: a. Many wheel hub seal lips are made from a plastic compound. b. Springless seals may be used in applications where they must seal a light fluid. c. A spring-loaded seal helps compensate for wheel hub bore eccentricity. d. The sealer on the outer surface of a seal housing improves seal and hub bore alignment
c
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
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: a. Repack and readjust the wheel bearings in the hub. b. Tighten the hub nut to the specified torque. c. Inspect the drive axle and hub splines, and replace the worn components. d. Replace the wheel bearing hub assembly.
d
The customer says her front-wheel-drive car has a noise and vibration when decelerating and is most noticeable under 50 mph. 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
When inspecting and servicing front wheel bearings on front-wheel-drive cars: a. Some one-piece front wheel bearing hubs are bolted to the front strut. b. In a one-piece front wheel bearing hub, the outer end of the drive axle is splined to the outer bearing race. c. When the steering knuckle contains two tapered roller bearings, the torque on the drive axle nut does not affect bearing endplay. d. Some front wheel bearings mounted in the steering knuckle contain two tapered roller bearings with a split inner race
d
