Chrysler Concorde 1993, Руководство по обслуживанию, Страница: 716 / 820

WARNING: FAILURE TO EQUIP THE VEHICLE WITH
TIRES HAVING ADEQUATE SPEED RATING CAN
CAUSE SUDDEN TIRE FAILURE.
ROTATION
DIRECTIONAL TREAD PATTERN TIRES
Some vehicles are fitted with special high-
performance tires having a directional tread pattern
designed to improve traction on wet pavement.
To obtain the full benefits of this design, the tires
must be installed so that they rotate in the correct
direction. This is indicated by arrows on the tire
sidewalls.
When wheels and tires are being installed, extra care
is needed to ensure that this direction of rotation is
maintained.
Refer to Owner’s Manual for rotation schedule.
NON-DIRECTIONAL TIRES
Tires on the front and rear axles of vehicles operate
at different loads and perform different steering, driv-
ing, and braking functions. For these reasons, they
wear at unequal rates, and tend to develop irregular
wear patterns. These effects can be reduced by timely
rotation of tires. Rotation will increase tread life, help
to maintain mud, snow, and wet traction levels, and
contribute to a smooth, quiet ride.
The suggested rotation method is the forward-cross
tire rotation method. This method takes advantage of
current tire industry practice which now allows cross
rotation of radial-ply tires. Refer to the Owner’s
Manual for additional information. Other rotation
methods may be used, but may not have all the benefits
of the recommended method.
Always check air pressure and wheel nut torque
after rotation. Do NOT use oil or grease on studs or
nuts.
Refer to Owner’s Manual for rotation schedule.
TREAD WEAR INDICATORS
Tread wear indicators (Fig. 3) are molded into the
bottom of the tread grooves. When tread depth is 1.6
mm (1/16 in.), the tread wear indicators will appear as
a 13 mm (1/2 in.) band.
Tire replacement is necessary when indicators ap-
pear in two or more grooves, or if localized balding
occurs.
REPAIRING LEAKS
For proper repairing, a radial tire must be removed
from the wheel. Repairs should only be made if the
defect or puncture is in the tread area. Otherwise the
tire should be replaced.
Deflate tire completely before dismounting tire from
the wheel. Use lubrication such as a mild soap solution
when dismounting or mounting tire. Use tools free of
burrs or sharp edges which could damage the tire or
wheel rim.
Before mounting tire on wheel, make sure all rust
scale is removed from the rim and repaint if necessary.
Install wheels on vehicle, progressively tightening
wheel nuts to 129 N
I
m (95 ft. lbs.) torque (See Wheels).
TIRE NOISE OR VIBRATION
Radial-ply tires are sensitive to force impulses
caused by improper mounting, wheel irregularities, or
imbalance.
To determine if the tires are causing the noise or
vibration, drive the vehicle over a smooth portion of
highway at different speeds. Then note the effect of
acceleration and deceleration on noise level. Differen-
tial and exhaust noise will change in intensity as speed
varies, while tire noise will usually remain constant.
TIRE WEAR PATTERNS
Under inflation results in faster wear on shoulders of
tire.
Over inflation causes faster wear at center of tread.
Excessive camber causes the tire to run at an angle
to the road. One side of tread is worn more than the
other.
Excessive toe-in or toe-out causes wear on the tread
edges of the tire, from dragging of tire. There is a
feathered effect across the tread.
Refer to figure 4 for tire tread wear cause/effect and
correction.
To determine the cause and correction of vehicle lead,
refer to the lead correction chart.
Fig. 3 Tread Wear Indicators
WHEELS—TIRES 22 - 3