Wheel And Tire Runout - Jeep 1979 CJ-5 Technical & Service Manual

WHEELS AND TIRES 2H-9
A D D BALANCE
WEIGHTS HERE
T I R E OR WHEEL TRAMP,
OR WHEEL HOP
CORRECTIVE WEIGHT
LOCATION
7 0 2 2 7
Fig. 2H-11 Static Unbalance
A D D BALANCE
WEIGHTS HERE
/
p
A
H E A V Y SPOT
WHEEL S H I M M Y
A N D V I B R A T I O N
CORRECTIVE WEIGHT
LOCATION
7 0 2 2 6
Fig. 2H-12 Dynamic Unbalance
Since procedures vary with different machines, follow
the equipment manufacturers operating instructions ex-
plicitly to obtain satisfactory results.
WARNING: On-vehicle type wheel balancers may be
used on the rear wheels of vehicles equipped with a
Trac-Lok differential, but only after raising the rear end
and removing the wheel opposite the one being balanced.
In addition, do not exceed 35 mph (56 km/h) on the
speedometer when spinning wheels. As a result of dif-
ferential action, actual wheel speed is double the speed
indicated on the vehicle speedometer. The centrifugal
force generated by a tire spinning at high speed could
cause damage and personal injury.
ments should be made on the vehicle with the tires
inflated to recommended levels and with the wheel bear-
ings adjusted to specifications.
Measure radial runout at the center and outside ribs
of the tread face (fig. 2H-13). Measure lateral runout at
the tire sidwall just above the buffing rib on the sidewall
(fig.2H-13).
On conventional tires, radial runout should not exceed
0.105 inch (2.66 mm) and lateral runout should not ex-
ceed 0.080 inch (2.03 mm). Mark the high points of lat-
Wheel and Tire Runout
Excessive radial or lateral runout of a wheel or tire
can cause roughness, vibration, tramp, tire wear, and
steering wheel tremor.
Before checking runout, drive the vehicle for at least
seven miles to remove temporary flat spots that may
have formed in the tires. Flat spots must be removed to
avoid false readings when measuring runout.
Measure runout using a dial indicator. All measure-
4 1 4 1 2
R A D I A L L Y
Fig. 2H-13
L A T E R A L L Y
Tire Runout