1993 DODGE TRUCK Service Repair Manual

22 - 8
WHEELS
AND
TIRES

•

ADP
BALANCE
WEIGHTS
HERE
TIRE
OR
WHEEL TRAMP,
OR WHEEL
HOP Fig. 6 Static Unbalance & Balance
CORRECTIVE

WEIGHT
LOCATION ADD BALANCE
WEIGHTS HERE
J8922-8

HEAVY SPOT
WHEEL SHIMMY
AND VIBRATION
CORRECTIVE
WEIGHT
LOCATION
J8922-9

Fig. 7 Dynamic Unbalance & Balance
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 de­
grees 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 101.6 mm (4.0 in.) of the
first spot and is still excessive, replace the tire.
• If the high spot is within 101.6 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 101.6 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 re­
mount it 90 degrees on the rim in that direction (Fig.
10).
This procedure will normally reduce the runout
to an acceptable amount.

TIRE
AND WHEEL RUNOUT
Radial runout is the difference between the high
and low points on the tire or wheel (Fig. 11). Lateral runout is the wobble of the tire or wheel.
Radial runout of more than 1.5 mm (.060 inch)
measured at the center line of the tread may cause
the vehicle to shake.

•

WHEELS
AND
TIRES
22 - 9

Fig.
8 First Measurement On
Tire
VALVE STEM

REFERENCE
AAARK J9322-4

Fig.
9
Remount
Tire
180
Degrees
Lateral runout of more than 2.0 mm (.080 inch)
measured near the shoulder of the tire may cause the
vehicle to shake.
Sometimes radial runout can be reduced. Relocate
the wheel and tire assembly on the mounting studs (See Method 1). If this does not reduce runout to an
acceptable level, the tire can be rotated on the wheel. (See Method 2). 2ND HIGH SPOT
ON TIRE
SPOT ON TIRE J9322-5

Fig.
10
Remount
Tire
90
Degrees
In Direction of

Arrow
J9022-4

Fig.
11
Checking
Tire
Runout
METHOD
1
(RELOCATE WHEEL
ON HUB) Check accuracy of the wheel mounting surface; ad­
just wheel bearings.
Drive vehicle a short distance to eliminate tire flat
spotting from a parked position. Make sure all wheel nuts are properly torqued.
Relocate wheel on the mounting, two studs over
from the original position.
Re-tighten wheel nuts until all are properly
torqued, to eliminate brake distortion.
Check radial runout. If still excessive, mark tire
sidewall, wheel, and stud at point of maximum
runout and proceed to Method 2.

22
- 10
WHEELS
AND
TIRES

•
J8922-11

Fig.
12
Checking
Wheel
Runout
METHOD
2
(RELOCATE
TIRE
ON
WHEEL)

Rotating tire on wheel is particularly effective
when there is runout in both tire and wheel. Remove tire from wheel and re-mount wheel on
hub in former position. Check wheel radial runout (Fig. 12).
• STEEL WHEELS: Radial runout 0.040 in., Lateral
runout 0.045 in. • ALUMINUM WHEELS: Radial runout 0.030 in.,
Lateral runout 0.035 in.
If point of greatest runout is near original chalk
mark, remount tire 180 degrees. Recheck runout.

•

WHEELS
AND
TIRES
22-11 VEHICLE VIBRATION

Vehicle vibration can
be
caused by:
• Tire/wheel unbalance
or
excessive runout
• Defective tires with extreme tread wear
• Nylon overlay flat spots (performance tires only)
• Incorrect wheel bearing adjustment
(if
applicable)
• Loose
or
worn suspension/steering components
• Certain tire tread patterns
• Incorrect drive shaft angles
or
excessive drive
shaft/yoke runout
• Defective
or
worn U-joints
• Excessive brake rotor
or
drum runout
• Loose engine
or
transmission supports/mounts
• And
by
engine operated accessories Refer
to the
appropriate Groups
in
this man­
ual for additional information.

VIBRATION
TYPES
There are two types
of
vehicle vibration:
• Mechanical
• Audible. Mechanical vehicle vibration
can be
felt through
the seats, floor pan and/or steering wheel. Audible vehicle vibration
is
heard above normal
background noise.
The
sound
can be a
droning
or
drumming noise. Vibrations
are
sensitive
to
change
in
engine
torque, vehicle speed
or
engine speed.

ENGINE TORQUE SENSITIVE VIBRATION
This vibration can
be
increased
or
decreased by:
• Accelerating
• Decelerating
• Coasting
• Maintaining
a
constant vehicle speed

VEHICLE SPEED SENSITIVE VIBRATION
This vibration condition always occurs
at
the same
vehicle speed regardless
of
the engine torque
or en­

gine speed.

ENGINE SPEED
{RPM}
SENSITIVE VIBRATION
This vibration occurs
at
varying engine speeds.
It

can
be
isolated
by
increasing
or
decreasing
the en­

gine speed with the transmission
in
NEUTRAL posi­
tion.

VIBRATION
DIAGNOSIS
A vibration diagnosis should always begin with
a

10 mile (16 km) trip (to warm the vehicle and tires).
Then
a
road test
to
identify the vibration. Corrective action should
not be
attempted until
the
vibration
type has been identified
via a
road test. During the road test, drive the vehicle
on a
smooth
surface.
If
vibration exists, note
and
record
the
fol­
lowing information: • Identify
the
vehicle speed range when
the
vibra­
tion occurs
• Identify the type
of
vibration
• Identify the vibration sensitivity
• Determine
if
the vibration
is
affected
by
changes
in vehicle speed, engine speed and engine torque. When the vibration has been identified, refer to the
Vibration Diagnosis chart
for
causes. Consider cor­
recting only those causes coded
in
the chart that
are

related
to
the vibration condition.
Refer
to
the following cause codes and descriptions
for explanations when referring
to
the chart.
TRR—Tire
and
Wheel Radial Runout: Vehicle
speed sensitive, mechanical vibration.
The
runout
will not cause vibration below
20
mph (32 km/h).
WH—Wheel Hop: Vehicle speed sensitive,
me­

chanical vibration.
The
wheel
hop
generates rapid
up-down movement
in
the steering wheel. The vibra­
tion
is
most noticeable
in the 20 - 40
mph
(32 - 64

km/h) range. The wheel hop will not cause vibration
below
20
mph (32 km/h). Wheel hop
is
caused
by a

tire/wheel that
has a
radial runout
of
more than 0.045 of-an-inch (1.14 mm).
If
wheel runout
is
accept­
able
and
combined runout cannot
be
reduced
by re­

positioning the tire
on
wheel, replace tire.
TB—Tire/Wheel Balance: Vehicle speed sensitive,
mechanical vibration. Static tire/wheel unbalance
will not cause vibration below 30 mph (46 km/h). Dy­
namic tire/wheel unbalance will
not
cause vibration
below
40
mph (64 km/h). TLR—Tire/Wheel Lateral runout: Vehicle speed
sensitive, mechanical vibration. The runout will
not

cause vibration below
50 - 55 mph (80 - 88
km/h).
Excessive lateral runout will also cause front-end shimmy. TW—Tire Wear: Vehicle speed sensitive, audible
vibration. Abnormal tire wear causes small vibration in
the 30 - 55
mph
(88
km/h) range. This will pro­
duce
a
whine noise
at
high speed.
The
whine will
change
to a
growl noise when the speed
is
reduced. W—Tire Waddle: Vehicle speed sensitive, mechan­
ical vibration. Irregular tire uniformity
can
cause
side-to-side motion during speeds
up to 15
mph
(24

km/h).
If
the motion
is
excessive, identify
the
defec­
tive tire and replace
it.
U A J—Universal Joint (Drive Shaft) Angles:
Torque/vehicle speed sensitive, mechanical/audible
vibration. Incorrect drive shaft angles cause mechan­ ical vibration below
20
mph (32 km/h) and
in
the
70

mph (112 km/h) range. The incorrect angles can also
produce
an
audible vibration
in
the 20
-
50 mph (32
-
80 km/h) range. Caster adjustment could
be
required
to correct the angles. UJ—Universal Joints: Engine torque/vehicle
speed sensitive, mechanical/audible vibration.
If
the

22-12
WHEELS
AND
TIRES

VIBRATION
DIAGNOSIS

Vibration

Sensitivity
Correction
Codes
For
Mechanical
Vibrations
Within
Specific
MPH
(km/h)
Ranges
10

(16km)
20
(32 km) 30
(48 km) 40
(64 km) 50
(80 km) 60
(96 km) 70
(112 km) 80
(128 km) 90
(144 km) Vehicle

Speed

Sensitive
•W
-WH-
-TRR
and
SSC-

-UJ
and AN-
-WB-
-TB-

-DSY
•TLR-

Torque

Sensitive
I

-UJA-
•
UJ
and AN
•

•UJA-

Engine
Speed

Sensitive
•ES

•EA-

•DEM-

Vibration

Sensitivity
Correction
Codes
For
Audible
Vibrations
Within
Specific
MPH
(km/h)
Ranges
10
(16 km) 20
(32 km) 30
(48 km) 40
(64 km) 50
(80 km) 60
(96 km) 70
(112 km) 80
(128 km) 90
(144 km)
Vehicle
Speed

Sensitive
•UJA-

JU
and WH
•DSY"

-TW-

•WB-

Torque

Sensitive
-AN
*

-UJ
and
TED,

Engine
Speed

Sensitive
•
EA
and
ES-

-ADB-

-DEM-
J8922-12

U-joint is worn it will cause vibration with almost
any vehicle speed/engine torque condition. DSY—Drive Shaft and Yokes: Vehicle speed sen­
sitive, mechanical/audible vibration. The condition
will not cause vibration below 35 mph (56 km/h). Ex­
cessive runout, unbalance or dents and bends in the shaft will cause the vibration. Identify the actual
cause and repair/replace as necessary.
WB—Wheel Bearings: Vehicle speed sensitive,
mechanical/audible vibration. Loose wheel bearings
cause shimmy-like vibration at 35 mph (56 km/h)
and above. Worn bearings will also produce a growl
noise at low vehicle speed and a whine noise at high
vehicle speed. The wheel bearings must be adjusted
or replaced, as applicable.
AN—Axle Noise: Engine torque/vehicle speed sen­
sitive, mechanical/audible vibration. The axle will
not cause mechanical vibration unless the axle shaft
is bent. Worn or damaged axle pinion shaft or differ­
ential gears and bearings will cause noise. Replace
the defective component(s) as necessary.
SSC—Suspension and Steering Components:
Vehicle speed sensitive, mechanical vibration. Worn
suspension/steering components can cause mechani­ cal vibration at speeds above 20 mph (32 km/h).
Identify and repair or replace the defective compo­
nent
(s).

EA—Engine Driven Accessories: Engine speed
sensitive, mechanical/audible vibration. Vibration
can be caused by loose or broken A/C compressor, PS
pump, water pump, generator or brackets, etc. Usu­ ally more noticeable when the transmission is shifted
into the NEUTRAL position and the engine speed (rpm) increased. Inspect the engine driven accesso­
ries in the engine compartment. Repair/replace as
necessary.
ADB—Accessory Drive Belts: Engine speed sen­
sitive, audible vibration. Worn drive belts can cause
a vibration that produces either a droning, fluttering
or rumbling noise. Inspect the drive belt(s) and tight­
en/replace as necessary.
DEM—Damaged Engine or Transmission Sup­
port Mounts: Engine speed sensitive, mechanical/ audible vibration. If a support mount is worn, noise
or vibration will occur. Inspect the support mounts and repair/replace as necessary.
ES—Exhaust System: Engine speed sensitive, me­
chanical/audible vibration. If loose exhaust compo­
nents contact the vehicle body they will cause noise
and vibration. Inspect the exhaust system for loose,
broken and mis-aligned components and repair/re­ place as necessary.

•

WHEELS
AND
TIRES
22 - 13
LUG
NUT
TORQUE

DESCRIPTION

1/2x20
with
60°
Cone 15 Inch Wheel

1/2x20
with
90°
Cone 16 Inch Single Wheel

5/8x18
with
90°
Cone 16 Inch Single Wheel

5/8x18
with Flanged
Nut..
16 Inch Dual Wheel
TORQUE

109
to 150
N-m
(80 to 110 ft.
lbs.)

115
to
155 N-m
(85 to 115
ft. lbs.)

240 to 305 N-m
(175 to
225 ft. lbs.)

410 to 475 N-m
(300 to
350 ft. lbs.)

J9322-9

TORQUE SPECIFICATIONS

•

BODY
COMPONENTS
23 - 1
CONTENTS

page
page

CAB/BODY
INTERIOR COMPONENTS
35
FIXED
GLASS
. 29
DOORS
21
PAINT
CODE
CHART
54

EXTERIOR
COMPONENTS
1
REFINISHING
PROCEDURES
54
EXTERIOR COMPONENTS
INDEX

page

Battery
Tray
7

Blower Motor Housing
Insulation
Panel—Diesel
Engine
Only
7

Body
Mouldings, Nameplates
and
Decals .......
9

Cab
. 14

Cab/Body
and
Cargo
Box
Stripes
11

Cargo
Box
19
Cowl
Grille
7
Front
Fenders
8
Fuel
Filler
Door
and
Nozzle/Tubes
12

Grille
and
Grille
Extension Panel
1

Grille
Extension Panel Support Bracket
(With
Diesel Engine Only)
3
page

Grille
Opening Panel (GOP)
and
Radiator Support Panel
3

Hatchgate
and
Components
16

Hood
5

Hood
Inside Release Cable
5

Hood
Latch
4

Labels/Decals/Plates
1

Outside Mirrors
13
Roof
Vent—Ramcharger
. 20

Splash
Shields—Front Fender
9

Sport
Bar
18

Tailgate
14

LABELS/DECALS/PLATES
GENERAL
INFORMATION The labels, decals
and
plates that
are
attached
to

Ram Van
and
Wagon vehicles contain safety
or
oth­ erwise essential information (Figs.
1, 2, 3 and 4).

INSTALLATION
Follow the instructions included with each replace­
ment label, decal
or
plate
to
affix
it to a
panel
or
component.

GRILLE
AND GRILLE EXTENSION PANEL
GRILLE
REMOVAL (1) Remove screws that attach the headlamp bezels
(Fig.
5) to the
grille.

(2)
Separate
the
bezels from
the
headlamps
(Fig.

5).
(3) Raise
and
support
the
hood.
(4) Remove the grille screws from the radiator sup­
port panel
and the
extension panel (Fig.
6).
(5) Remove
the
grille from the front
of
the vehicle.
EMISSION
CONTROL
DRIVE
BELT

INFORMATION
AND
VACUUM
ROUTING
LABEL
HOSE
ROUTING
LABEL
(DIESEL

Fig.
1 Underhood Labels, Decals & Plates
BODY
COMPONENTS