Automotive Technology A Systems Approach 5th edition chapter 44

5.Describe the procedure for using a plug to seal a puncture in a tire.

Clean the punctured area with abrasive tool and put sealant on plug and insert plug.

1.List five things that could cause premature bearing failure.

Dirt lack of lubrication improper adjustment wrong wheels worn seal

4.Define dynamic and static wheel balance.

Dynamic balance is the equal distribution of weight on each side of the center line. Static is the equal distribution of weight around the tire.

3.Why is tire rotation recommended by most manufacturers?

For even wear of tires.

6.The rim offset is the vertical distance between the back rim centerline and the ______ ______ of the dics.

Mounting Face.

2.Explain the purpose of the wheel rim drop center and safety ridges.

Those features are for easy installation and to remove the tires.

Sipes

a groove or channel in the tread of a tire to improve its grip

Lateral runout

a tire that wobbles side to side

Hub

bolted to the wheel by lug bolts

Wheel shimmy

caused by wheels that are dynamically unbalanced

Drop center

designed to allow for easy tire removal and installation

Radial runout

eccentricity

Radial ply

have body cords that extend from bead to bead at an angle of about 90 degrees or "radial" to the circumferential centerline of the tire

Bias ply 7.- 8.- 9.- 10.- 11.- 12.- 13. 14. 15. 16. 17. Review Questions 7.To calculate the tire aspect ratio, the tire section height is divide by the ______. Section weight. 8.True or False? All TPMS have a pressure sensor mounted inside the tire and wheel assembly. True 9.A tire that wobbles from side to side is said to have _____. B 10.A front tire has excessive wear on both edges of the tire tread. The most likely cause of this problem is ______. B 11.All of the following correct are correct except ______. D 12.All of the following correct are correct except ______. B 13.Which of the following statements about sidewall markings is correct? D 14.All of these statements about improper wheel balance are true except ______. B 15.Most information about a car's tires can be found on the ______. B ASE Style Review Questions 1.Technician A says that the wheel bearings on a typical FWD car are pressed in and out of the steering knuckle assembly. Technician B says that the rear wheel bearing on a typical FWD car are serviced in the same way as the front bearings for a RWD car. Who is correct? A 2.Technician A says that dynamic wheel unbalance causes wheel shimmy. Technician B says that static wheel unbalance causes wheel tramp. Who is correct? C 3.Technician A says that front bearing assembly locknuts for RWD vehicles are typically heavily torqued to maintain the bearing adjustment. Technician B says that the axle nuts for a FWD wheel bearing assembly is often staked in place to maintain its specified torque. Who is correct? C 4.Technician A says that replacement wheel rims should be the same as the original equipment wheels in load capacity, offset, width, diameter, and mounting configuration. Technician B says that if wheels are installed that have a different stock width or diameter, make sure to use a tire that has the same overall width as the original tires. Otherwise the vehicle's wheel speed sensors, speedometer, antilock brake system, and many other systems will be affected. Who is correct? A 5.Technician A says that underinflation can increase the rolling resistance of a tire. Technician B says that underinflation can cause hard steering and a 10% decrease in fuel economy. Who is correct? C 6.While choosing the correct tire for a vehicle: Technician A says that a tire with a temperature resistance rating of B will dissipate more heat than one rated with an A. Technician B says that the temperature rating indicates how well a tire will perform when it is hot. Who is correct? B 7.Technician A says that on most vehicles, the wheel/tire assembly is considered sprung weight. Technician B says that low unsprung weight makes the vehicle handle better on irregular surfaces. Who is correct? C 8.While discussing run-flat tires: Technician A says that some are self-sealing tires and are designed to quickly and permanently seal most tread area punctures. Technician B says that most of these tires have reinforced sidewalls that are able to support the vehicle at any speed without air in the tire. Who is correct? D 9.Technician A says that the aspect ratio of a tire represents the relationship between the tire's cross-sectional height to its cross-sectional width. Technician B says that low aspect ratios provide a softer ride because they will deflect more over irregular surfaces and under heavy loads. Who is correct? C 10.While discussing the effects of loose wheel bearings: Technician A says that the vehicle will handle poorly. Technician B says that the bearing may overheat. Who is correct? C

have fabric flies that run alternatively and form a crisscross design

Tire pressure monitoring (TPM) systems

installation of this system is required by the NHTSA for vehicle safety

Aspect ratio

profile of the tire

Uniform Tire Quality Grading (UTQG)

rating system comprised of: treadwear, traction, and temperature resistance

Plies

rubber-impregnated cords

Sidewalls

sides of the tire's body

Static balance

the equal distribution of weight around the wheel

Dynamic balance

the equal distribution of weight on each side of the centerline

Tread

the portion of the tire that comes in contact with he road surface

Bead

the portion of the tire that helps keep it in contact with the rim of the wheel

Wheel offset

the vertical distance between the centerline of the rim and the mounting face of the wheel

Belted bias ply

tires, similar to bias ply tires, except that two or more belts run the circumference of the tire under the tread

Wheel tramp

wheels that are statically unbalanced and cause a bouncing action