Chrysler PT Cruiser 2001 Service Manual Supplement page 1397

22 - 6 TIRES AND WHEELS
SERVICE PROCEDURES (Continued)
Fig. 5 Under Inflation Wear
1 – THIN TIRE TREAD AREAS
Fig. 6 Over Inflation Wear
1 – THIN TIRE TREAD AREA
Inflation pressures specified on the placard are
always the cold inflation pressure of the tire. Cold
inflation pressure is obtained after the vehicle has
not been operated for at least 3 hours, or the vehicle
is driven less than one mile after being inoperative
for 3 hours. Tire inflation pressures may increase
from 2 to 6 pounds per square inch (psi) during oper-
ation. Do not reduce this normal pressure build-up.
WARNING: OVER OR UNDER INFLATED TIRES
CAN AFFECT VEHICLE HANDLING. THE TIRE CAN
FAIL SUDDENLY, RESULTING IN LOSS OF VEHICLE
CONTROL.
TIRE PRESSURE FOR HIGH SPEED
OPERATION
WARNING: OVER OR UNDER INFLATED TIRES
CAN AFFECT VEHICLE HANDLING. THE TIRE CAN
FAIL SUDDENLY, RESULTING IN LOSS OF VEHICLE
CONTROL.
DaimlerChrysler Corporation advocates driving
this vehicle at safe speeds and within the posted
speed limits. Where speed limits allow the vehicle to
be driven at high speeds, the correct tire inflation
pressure is very important. For speeds up to and
including 120 km/h (75 mph), tires must be inflated
to the pressures shown on the label applied to the
rear facing of the driver's door. For continuous speeds
in excess of 120 km/h (75 mph), tires must be
inflated to the maximum pressure specified on the
tire's sidewall.
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 in the drop well on the tire side 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
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. 7).
(2) Break down the tire and remount it 180
degrees on the rim (Fig. 8).
(3) Measure the total indicator runout again. Mark
the tire to indicate the high spot.
(4) If runout is still excessive (in excess of 1.524
mm or 0.060 in.), the following procedures must be
done.
• If the new high spot is within 102 mm (4.0 in.)
of the first spot on the tire and is still excessive,
replace the tire.
• If the new high spot is within 102 mm (4.0 in.)
of the first spot on the wheel, the wheel may be out
of specifications. Refer to Tire and Wheel Runout.
• If the new high spot is NOT within 102 mm (4.0
in.) of either high spot, draw an arrow on the tread
PT