TIRE NOISE OR VIBRATION
Radial-ply tires are sensitive to force impulses
caused
by
improper
mounting,
vibration,
wheel
defects, or possibly tire imbalance.
To find out if tires are causing the noise or vibra-
tion, drive the vehicle over a smooth road at varying
speeds. Note the effect of acceleration and decelera-
tion on noise level. Differential and exhaust noises
will change in intensity as speed varies, while tire
noise will usually remain constant.
SERVICE PROCEDURES
ROTATION
Tires on the front and rear axles operate at differ-
ent loads and perform different steering, driving, and
braking functions. For these reasons;
•
They wear at unequal rates
•
Tend to develop irregular wear patterns
These effects can be reduced by timely rotation of
tires. The benefits of rotation are especially worth-
while. Rotation will:
•
Increase tread life
•
Help to maintain mud, snow, and wet traction
levels
•
Contribute to a smooth, quiet ride
The suggested method of tire rotation is (Fig. 6).
Other rotation methods can be used, but they will
not provide all the tire longevity benefits.
MATCH MOUNTING
NOTE: Tires
and
wheels
are
currently
match
mounted at the factory.
Match mounting is a technique used to reduce
runout in the wheel/tire assembly. This means that
the high spot of the tire is aligned with the low spot
on the wheel rim. The high spot on the tire is
marked with a paint mark or a bright colored adhe-
sive label on the outboard sidewall. The low spot on
the rim is identified with a label on the outside of the
rim and a dot on the inside of the rim. If the outside
label has been removed the tire will have to be
removed to locate the dot 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).
Fig. 5 Tire Wear Patterns
CONDITION
RAPID
WEAR
AT
SHOULDERS RAPID
WEAR
AT
CENTER
CRACKED TREADS WEAR ON ONE SIDE
FEATHERED EDGE
BALD SPOTS
SCALLOPED WEAR
EFFECT
CAUSE
UNDER-INFLATION
OR LACK OF ROTA-
TION
OVER-INFLATION
OR LACK OF ROTA-
TION
UNDER-INFLATION
OR
EXCESSIVE
SPEED*
EXCESSIVE CAMBER
INCORRECT TOE
UNBALANCED WHEEL
OR TIRE DEFECT*
LACK OF ROTATION OF TIRES OR
WORN
OR
OUT-OF-ALIGNMENT
SUSPENSION.
CORRECTION
ADJUST
PRES-
SURE TO SPEC-
IFICATIONS
WHEN
TIRES
ARE
COOL
ROTATE TIRES
ADJUST CAMBER TO SPECIFICATIONS
ADJUST TOE-IN TO
SPECIFICATIONS DYNAMIC
OR
STATIC
BALANCE
WHEELS
ROTATE
TIRES
AND
INSPECT
SUSPENSION SEE
GROUP 2
*HAVE
TIRE
INSPECTED
FOR
FURTHER USE.
Fig. 6 Tire Rotation Pattern
FRONT
22 - 4
TIRES AND WHEELS
ZG
DIAGNOSIS AND TESTING (Continued)
Summary of Contents for 1997 Grand Cherokee
Page 6: ...FASTENER IDENTIFICATION 4 INTRODUCTION ZG GENERAL INFORMATION Continued ...
Page 9: ...METRIC CONVERSION ZG INTRODUCTION 7 GENERAL INFORMATION Continued ...
Page 12: ......
Page 58: ......
Page 180: ......
Page 228: ......
Page 274: ......
Page 282: ...COOLING SYSTEM DIAGNOSIS DIESEL ENGINE 7 8 COOLING SYSTEM ZG DIAGNOSIS AND TESTING Continued ...
Page 283: ...ZG COOLING SYSTEM 7 9 DIAGNOSIS AND TESTING Continued ...
Page 284: ...7 10 COOLING SYSTEM ZG DIAGNOSIS AND TESTING Continued ...
Page 285: ...ZG COOLING SYSTEM 7 11 DIAGNOSIS AND TESTING Continued ...
Page 286: ...7 12 COOLING SYSTEM ZG DIAGNOSIS AND TESTING Continued ...
Page 290: ...SERPENTINE DRIVE BELT DIAGNOSIS 7 16 COOLING SYSTEM ZG DIAGNOSIS AND TESTING Continued ...
Page 318: ......
Page 330: ......
Page 340: ......
Page 402: ......
Page 423: ...VIC Initial Set Up ZG INSTRUMENT PANEL SYSTEMS 8E 21 SERVICE PROCEDURES Continued ...
Page 424: ...VIC Reset 8E 22 INSTRUMENT PANEL SYSTEMS ZG SERVICE PROCEDURES Continued ...
Page 436: ......
Page 454: ......
Page 468: ......
Page 470: ......
Page 510: ......
Page 520: ......
Page 532: ......
Page 560: ......
Page 572: ......
Page 580: ......
Page 596: ......
Page 610: ......
Page 622: ......
Page 680: ......
Page 700: ......
Page 712: ......
Page 752: ......
Page 772: ......
Page 780: ......
Page 842: ......
Page 852: ......
Page 868: ......
Page 872: ......
Page 890: ......
Page 908: ......
Page 974: ......
Page 1056: ......
Page 1090: ......
Page 1104: ......
Page 1106: ......
Page 1118: ......
Page 1136: ......
Page 1176: ......
Page 1196: ......
Page 1208: ......
Page 1248: ......
Page 1268: ......
Page 1270: ......
Page 1271: ......
Page 1272: ......
Page 1273: ......
Page 1274: ......
Page 1276: ......
Page 1338: ......
Page 1348: ......
Page 1364: ......
Page 1368: ......
Page 1386: ......
Page 1404: ......
Page 1470: ......
Page 1492: ......
Page 1542: ......
Page 1552: ......
Page 1584: ......
Page 1598: ......
Page 1655: ...Fig 3 Oil Lubrication System ZG 5 2L ENGINE 9 57 DESCRIPTION AND OPERATION Continued ...
Page 1684: ...TORQUE 9 86 5 2L ENGINE ZG SPECIFICATIONS Continued ...
Page 1689: ...Fig 3 Oil Lubrication System ZG 5 9L ENGINE 9 91 DESCRIPTION AND OPERATION Continued ...
Page 1723: ...DIAGNOSIS AND TESTING SERVICE DIAGNOSIS DIESEL PERFORMANCE ZG ENGINE 9 3 ...
Page 1724: ...9 4 ENGINE ZG DIAGNOSIS AND TESTING Continued ...
Page 1725: ...ZG ENGINE 9 5 DIAGNOSIS AND TESTING Continued ...
Page 1726: ...9 6 ENGINE ZG DIAGNOSIS AND TESTING Continued ...
Page 1727: ...ZG ENGINE 9 7 DIAGNOSIS AND TESTING Continued ...
Page 1728: ...9 8 ENGINE ZG DIAGNOSIS AND TESTING Continued ...
Page 1729: ...SERVICE DIAGNOSIS DIESEL MECHANICAL ZG ENGINE 9 9 DIAGNOSIS AND TESTING Continued ...
Page 1730: ...9 10 ENGINE ZG DIAGNOSIS AND TESTING Continued ...
Page 1731: ...ZG ENGINE 9 11 DIAGNOSIS AND TESTING Continued ...
Page 1762: ...SPECIFICATIONS ENGINE SPECIFICATIONS 9 42 ENGINE ZG ...
Page 1763: ...ZG ENGINE 9 43 SPECIFICATIONS Continued ...
Page 1862: ......
Page 1930: ......
Page 1934: ......
Page 2114: ......
Page 2122: ...DIAGNOSIS AND TESTING NV231 DIAGNOSIS 21 8 TRANSMISSION AND TRANSFER CASE ZG ...