Tires/Wheels - Chrysler 2004 Concorde Service Manual

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TIRES/WHEELS

TIRES/WHEELS
DIAGNOSIS AND TESTING - TIRE AND WHEEL
VIBRATION
Tire and wheel imbalance, runout and force varia-
tion can cause vehicles to exhibit steering wheel
vibration.
VISUAL INSPECTION
Visual inspection of the vehicle is recommended
prior to road testing or performing any other proce-
dure. Raise vehicle on a suitable hoist. (Refer to
LUBRICATION & MAINTENANCE/HOISTING -
STANDARD PROCEDURE)
Inspect for the following:
• Verify correct (OEM) wheel and tire, as well as
correct wheel weights. Aluminum wheels require
unique wheel weights. They are designed to fit the
contour of the wheel (Fig. 1).
• Inspect tires and wheels for damage, mud pack-
ing and unusual wear; correct as necessary.
• Check and adjust tire air pressure to the pres-
sure listed on the label attached to the rear face of
the driver's door.
Fig. 1 Aluminum Wheel Weight
1 - TIRE
2 - WHEEL
3 - WHEEL WEIGHT
ROAD TEST
Road test vehicle on a smooth road for a least five
miles to warm tires (remove any flat spots). Lightly
place hands on steering wheel at the 10:00 and 2:00
positions while slowly sweeping up and down from 90
to 110 km/h (55 to 70 mph) where legal speed limits
allow.
Observe the steering wheel for:
• Visual
Nibble (oscillation:
clockwise, usually due to tire imbalance)
tion up and down)
or is enhanced, vibration is likely due to causes other
than tire and wheel assemblies.
is occurring; if vibration is eliminated, vibration is
likely due to causes other than tire and wheel assem-
blies.
BASE/HYDRAULIC/MECHANICAL/ROTORS
DIAGNOSIS AND TESTING).
ENTIAL & DRIVELINE - DIAGNOSIS AND TEST-
ING).
with this diagnosis and testing procedure.
TIRE AND WHEEL BALANCE
essary following the wheel balancer manufacturer's
instructions and using the information listed in Stan-
dard Procedure - Tire And Wheel Balance. (Refer to
22 - TIRES/WHEELS - STANDARD PROCEDURE)
lowing the format described in Road Test.
diagnosis and testing procedure.
TIRE AND WHEEL RUNOUT/MATCH MOUNTING
system check will measure the radial runout includ-
ing the hub, wheel and tire.
dial indicator reading over 101.6 mm (4.0 inch) of
tread circumference.
indicator reading over 101.6 mm (4.0 inch) of tread
circumference.
clockwise/counter-
• Visual Buzziness (high frequency, rapid vibra-
To rule out vibrations due to brakes or powertrain:
• Lightly apply brakes at speed; if vibration occurs
• Shift transmission into neutral while vibration
For brake vibrations, (Refer to 5 - BRAKES -
For powertrain vibrations, (Refer to 3 - DIFFER-
For tire and wheel assembly vibrations, continue
(1) Balance the tire and wheel assemblies as nec-
(2) Road test the vehicle for at least 5 miles, fol-
(3) If the vibration persists, continue with this
(1) System Radial Runout. This on-the-vehicle
(a) Raise vehicle so tires clear floor. (Refer to
LUBRICATION & MAINTENANCE/HOISTING -
STANDARD PROCEDURE)
(b) Apply masking tape around the circumfer-
ence of the tire in the locations to be measured
(Fig. 2). Do not overlap the tape.
(c) Check system runout using Dial Indicator
Set, Special Tool C-3339A with 25-W wheel, or
equivalent. Place the end of the indicator against
each taped area (one at a time) (Fig. 2) and rotate
the tire and wheel. System radial runout should
not exceed 0.76 mm (0.030 inch) with no tread
"dips" or "steps." Tread "dips" and "steps" can be
identified by spikes of the dial indicator gauge.
• Tread dips ; Rapid decrease then increase in
• Tread steps ; Rapid decrease or increase in dial
LH
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