Chrysler New Yorker. Manual — part 312
300M
TIRES AND WHEELS
22 - 5
DIAGNOSIS AND TESTING (Continued)
SERVICE PROCEDURES
TIRE AND WHEEL ROTATION
NON-DIRECTIONAL TREAD PATTERN TIRES
Tires on the front and rear axles operate at different
loads and perform different functions. For these rea-
sons, they wear at unequal rates, and tend to develop
irregular wear patterns. These effects can be reduced by
timely rotation of tires. The benefits of rotation are
especially worthwhile. 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 (Fig. 6). This method takes
advantage of current tire industry practice which
allows rotation of radial-ply tires. Other rotation
methods may be used, but may not have all the ben-
efits of the recommended method.
NOTE: Only the 4 tire rotation method may be used
if the vehicle is equipped with a low mileage or tem-
porary spare tire.
DIRECTIONAL TREAD PATTERN TIRES
Some vehicles are fitted with special high-perfor-
mance tires having a directional tread pattern. These
tires are designed to improve traction on wet pave-
ment. To obtain the full benefits of this design, the
tires must be installed so that they rotate in the cor-
rect 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 rota-
tion is maintained.
Refer to Owner’s Manual for rotation schedule.
REPAIRING TIRE 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(Fig. 7). The
tire should be replaced if the puncture is located in
the sidewall.
Deflate tire completely before attempting to dis-
mount the tire from the wheel. Use a lubricant
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
is removed from the rim bead and repaint if neces-
sary.
Install wheel on vehicle, and progressively tighten
the 5 wheel nuts to a torque of 135 N·m (100 ft. lbs.).
TIRE AND WHEEL MATCH MOUNTING
Wheels and tires are match mounted at the factory.
This means that the high spot of the tire is matched
to the low spot on the wheel rim. This technique is
used to reduce run-out in the wheel/tire assembly.
The high spot on the tire is marked with a paint
mark or a bright colored adhesive label on the out-
board sidewall. The low spot on the rim is identified
with a label on the outside of the rim and a dot or
line on the inside of the rim. If the outside label has
been removed the tire will have to be removed to
locate the dot or line on the inside of the rim.
Before dismounting a tire from its wheel, a refer-
ence mark should be placed on the tire at the valve
Fig. 6 Forward-Cross Tire Rotation Method
Fig. 7 Tire Repair Area
22 - 6
TIRES AND WHEELS
300M
stem location. This reference will ensure that it is
remounted in the original position on the wheel.
(1) Measure the total indicator runout on the cen-
ter of the tire tread rib. Record the indicator reading.
Mark the tire to indicate the high spot. Place a mark
on the tire at the valve stem location (Fig. 8).
(2)
Break down the tire and remount it 180
degrees on the rim (Fig. 9).
(3) Measure the total indicator runout again. Mark
the tire to indicate the high spot.
(4) If runout is still excessive, the following proce-
dures must be done.
• If the high spot is within 102 mm (4.0 in.) of the
first spot and is still excessive, replace the tire.
• If the high spot is within 102 mm (4.0 in.) of the
first spot on the wheel, the wheel may be out of spec-
ifications. Refer to Wheel and Tire Runout.
• If the high spot is NOT within 102 mm (4.0 in.)
of either high spot, draw an arrow on the tread from
second high spot to first. Break down the tire and
remount it 90 degrees on rim in that direction (Fig.
10). This procedure will normally reduce the runout
to an acceptable amount.
CLEANING AND INSPECTION
CLEANING TIRES
Remove protective coating on tires before delivery
of vehicle. This coating may cause deterioration of
tires.
To remove the protective coating applying warm
water and let it soak for a few minutes. Then scrub
the coating away with a soft bristle brush. Steam
cleaning may also be used to remove the coating.
NOTE: DO NOT use gasoline, mineral oil, oil-based
solvent or wire brush for cleaning.
Fig. 8 First Measurement On Tire
Fig. 9 Remount Tire 180 Degrees
Fig. 10 Remount Tire 90 Degrees In Direction of
Arrow
300M
TIRES AND WHEELS
22 - 7
SERVICE PROCEDURES (Continued)
SPECIFICATIONS
TIRE SPECIFICATIONS
22 - 8
TIRES AND WHEELS
300M
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