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Chapter 111: Tire and Wheel Service

Terms in this set (29)

Tires should always be inflated to the pressure indicated on the driver's _______.
door (pillar sticker)
If tire pressure is low, the load capacity of the tire is __________.
decreased
Tires lose 1 PSI for every _____ degree drop in temperature.
10
If the inflation pressure of a tire dropped by 10 PSI, the life of the tire would be reduced by _____ %.
40
A drop of 8 PSI means there would be an approximate ____ mpg decrease in fuel economy.
2
The nitrogen molecule is slightly larger than the oxygen molecule so the tire will lose pressure _______ if air is used instead of nitrogen.
faster
Compressed nitrogen contains less _________ than compressed air.
moisture

When the tire heats up, moisture in the tire vaporizes and expands leading to an increase in tire pressure.
Some oxygen in tires could, over a long period of time, cause the __________ of the inner liner of the tire and corrosion of the wheel.
oxidation
Most shops that use nitrogen inflation install a _______ tire valve cap to let others know that nitrogen was used.
green
A painted dot or sticker on the sidewall of the tire represents the _______ diameter and/or _________ portion of tire tire.
largest
stiffest
Due to the overlapping of carcass and belt fabric layers, as well as tread and sidewall rubber splices.
The valve stem hole is typically drilled at the ________ diameter of the wheel.
smallest
Mounting the tires on the rim with the valve stem matched up with the mark on the tire is called?
Match Mounting
When cleaning the bead area of an aluminum (alloy) wheel, remember, steel is ________ than aluminum and a steel wire brush could causes __________ to be worn into the wheel.
harder

recesses
Tightening lug nuts gradually in the proper sequence of - tighten one, skip one, and tighten the next nut is known as the?
Star Pattern
Whenever you install a brand new set of aluminum wheels, re-torque the wheels after the first ____ miles.
25

The soft aluminum often compresses slightly, loosening the torque on the wheels.
Should the technician use hand tools or an air impact wrench to install anti-theft lug nuts?
Hand Tools
For best results, tires should be rotated every _______ miles or ____ months.
6000 miles

6 months
Wear on the outside shoulder only is an indication of an ________ problem.
alignment
Even though a tire has no visible faults, it can still be the cause of ________.
vibration.

If vibration is felt above 45 mph, regardless of the engine load, the cause is usually an out of balance or defective out of round tire.
What is the term for an up-and-down type of vibration?
Tramp
If vibration is seen in the hood of the vehicle or felt in the steering wheel, then the problem is usually the _______ tires.
front
What is the term for a rapid back-and-forth motion that is transmitted through the steering wheel linkage to the steering wheel?
Shimmy
The term that means that the weight mass is evenly distributed around the axis of rotation is what?
Static Balance - if you spin the wheel and it stops at different places with each spin, the tire is statically balanced.
Incorrect static balance causes what?
Tramp-type vibration
What is the term that means the centerline of weight of mass is in the same plane as the centerline of the wheel?
Dynamic Balance
Incorrect dynamic balance causes what?
Shimmy-type vibration
Tire balancing is actually counter-balancing a ______ spot with a weight.
heavy
Which type of weight, uncoated or coated, is recommended for use on alloy wheels?
Coated - lead weights that are painted or coated in a plastic material (nylon or polyester-type)
What does "Fe" stand for?
Steel
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