204-04-1 Wheels and Tires 204-04-1
SECTION 204-04 Wheels and Tires
VEHICLE APPLICATION:2007.50 Transit
CONTENTS PAGE
SPECIFICATIONS
Specifications...................................................................................................................... 204-04-2
DIAGNOSIS AND TESTING
Wheels and Tires................................................................................................................ 204-04-3
Inspection and Verification.................................................................................................. 204-04-3
Symptom Chart................................................................................................................... 204-04-4
REMOVAL AND INSTALLATION
Wheel and Tire................................................................................................................... 204-04-8
204-04-2 Wheels and Tires 204-04-2
SPECIFICATIONS
Torque Specifications
Description Nm lb-ft lb-in
Wheel nuts 200 148 -
Wheel and Tire Assembly Runout Specifications
Description Alloy Wheel (mm) Steel Wheel (mm)
Wheel lateral runout 0.3 0.8
Tire lateral runout 1.5 1.5
Maximum lateral runout 1.8 2.3
Wheel radial runout 0.3 0.8
Tire radial runout 1.3 1.3
Maximum radial runout 1.6 2.1
2007.50 Transit 11/2006 G25361en
204-04-3 Wheels and Tires 204-04-3
DIAGNOSIS AND TESTING
Wheels and Tires
Inspection and Verification
Visual Inspection Chart
Mechanical
Wheel(s)
Tire(s)
Tire pressure(s) *
Wheel nuts
Wheel studs
* Vehicles equipped with a tire pressure monitoring system must be inspected for correct operation,
REFER to Worldwide Diagnostic System (WDS).
To maximize tire performance, inspect the tires for During the road test, drive the vehicle on a road
signs of incorrect inflation and uneven wear which that is smooth and free of undulations. If vibration
may indicate a need for balancing, rotation or is apparent, note and record the following:
suspension alignment. Tires should also be – the speed at which the vibration occurs.
checked frequently for cuts, stone bruises,
abrasions, blisters and for objects that may have – what type of vibration occurs in each speed
become embedded in the tread. More frequent range.
inspections are recommended when rapid or – mechanical or audible
extreme temperature changes occur or when road – how the vibration is affected by changes in the
surfaces are rough or occasionally littered with following:
foreign material. – engine torque
As a further visible check of tire condition, tread – vehicle speed
wear indicators are molded into the bottom of the – engine speed
tread grooves. When these indicator bands become
visible, new tires must be installed. – type of vibration - sensitivity:
– torque sensitive
– vehicle speed sensitive
Tire Wear Diagnosis – engine speed sensitive
Uneven wear is usually caused by either excessive The following explanations help isolate the source
camber or excessive toe on tires. of the vibration.
Sometimes incorrect toe settings or worn struts will
cause severe `cupping' or `scalloped' tire wear on Torque Sensitive
non-driven wheels.
Severely incorrect toe settings will also cause other This means that the condition can be improved or
unusual wear patterns. made worse by accelerating, decelerating,
coasting, maintaining a steady vehicle speed or
applying engine torque.
Tire Vibration Diagnosis
A tire vibration diagnostic procedure always begins Vehicle Speed Sensitive
with a road test. The road test and customer
interview (if available) will provide much of the This means that the vibration always occurs at the
information needed to find the source of a vibration. same vehicle speed and is not affected by engine
torque, engine speed or the transmission gear
selected.
2007.50 Transit 11/2006 G25362en
204-04-4 Wheels and Tires 204-04-4
DIAGNOSIS AND TESTING
Engine Speed Sensitive A thumping noise usually means that the tire is flat
or has soft spots making a noise as they slap the
This means that the vibration occurs at varying roadway. Tire whine can be distinguished from axle
vehicle speeds when a different transmission gear noise. Tire whine remains the same over a range
is selected. It can sometimes be isolated by of speeds.
increasing or decreasing engine speed with the
A complete road test procedure is described in
transmission in NEUTRAL or by stall testing with
Section 100-04.
the transmission in gear. If the condition is engine
speed sensitive, the cause is probably not related REFER to:Noise, Vibration and Harshness (NVH)
to the tires. (100-04 Noise, Vibration and Harshness,
Diagnosis and Testing).
If the road test indicates that there is tire whine,
but no shake or vibration, the noise originates with
the contact between the tire and the road surface.
Symptom Chart
Symptom Possible Sources Action
• Tire(s) show excess wear on • Tire(s) under-inflated. • ADJUST the tire pressure(s).
edge of tread
• Vehicle overloaded. • CORRECT as necessary.
• Incorrect wheel alignment. • ADJUST the wheel alignment.
REFER to:(204-00 Suspension
System - General Information)
Specifications (Specifications),
Front Toe Adjustment (General
Procedures).
• Tire(s) show excess wear in • Tire(s) over-inflated. • ADJUST the tire pressure(s).
center of tread
• Other excessive tire wear • Incorrect tire pressure(s). • ADJUST the tire pressure(s).
concerns
• Wheel and tire assemblies • ROTATE the wheel and tire
need rotating. assemblies.
• Incorrect wheel alignment. • ADJUST the wheel alignment.
REFER to:(204-00 Suspension
System - General Information)
Specifications (Specifications),
Front Toe Adjustment (General
Procedures).
• Vehicle overloaded. • CORRECT as necessary.
• Loose or leaking front strut and • TIGHTEN or INSTALL new
spring assembly. suspension components as
necessary.
REFER to:Shock Absorber and
Spring Assembly (204-01
Front Suspension, Removal
and Installation).
2007.50 Transit 11/2006 G25362en
204-04-5 Wheels and Tires 204-04-5
DIAGNOSIS AND TESTING
Symptom Possible Sources Action
• Wheel bearings worn. • INSTALL new wheel bearings
as necessary. REFER to:
Wheel Bearing (204-01 Front
Suspension, Removal and
Installation),
Wheel Bearing (204-02 Rear
Suspension, Removal and
Installation).
• Suspension components, • CHECK or INSTALL new
bushings and ball joints. suspension components as
necessary.
• Excessive lateral or radial • BALANCE the wheel and tire
runout of wheel or tire. assemblies. Using a suitable
dial indicator gauge and
holding fixture, CHECK lateral
and radial runout of the wheel
and tire assemblies. INSTALL
new wheel and tire assemblies
as necessary. REFER to:(204-
04 Wheels and Tires)
Specifications (Specifications),
Wheel and Tire (Removal and
Installation).
• Wobble or shimmy affecting • Damaged wheel. • INSPECT the wheel rims for
wheel runout damage. BALANCE the wheel
and tire assemblies. Using a
suitable dial indicator gauge
and holding fixture, CHECK
lateral and radial runout of the
wheel and tire assemblies.
INSTALL new wheel and tire
assemblies as necessary.
REFER to:(204-04 Wheels and
Tires)
Specifications (Specifications),
Wheel and Tire (Removal and
Installation).
• Front wheel bearing. • CHECK or INSTALL new wheel
bearings as necessary.
REFER to:Wheel Bearing (204-
01 Front Suspension,
Removal and Installation).
• Excessive vehicle vibration, • Suspension components. • CHECK or INSTALL new
rough steering suspension components as
necessary.
• Vehicle vibrations from wheels • Incorrect tire pressure(s). • ADJUST the tire pressure(s).
and tires
• Wheel or tire imbalance. • BALANCE the wheel and tire
assemblies.
2007.50 Transit 11/2006 G25362en
204-04-6 Wheels and Tires 204-04-6
DIAGNOSIS AND TESTING
Symptom Possible Sources Action
• Uneven tire wear. • INSTALL a new tire(s) as
necessary.
REFER to:Wheel and Tire
(204-04 Wheels and Tires,
Removal and Installation).
• Brake disc imbalance. • CHECK the brake disc for
foreign material.
• Water in tire(s). • REMOVE the water.
• Bent wheel. • INSTALL a new wheel and tire
assembly.
REFER to:Wheel and Tire
(204-04 Wheels and Tires,
Removal and Installation).
• Incorrectly seated tire bead. • SPIN the wheel on the vehicle.
EXAMINE the area where the
tire and the wheel meet. If that
section of the tire appears to
waver while being rotated, the
tire bead may not be correctly
seated on the wheel. REMOVE
the tire and CLEAN the bead
seat areas on both wheel and
tire.
• Excessive lateral or radial • BALANCE the wheel and tire
runout of wheel or tire. assemblies. Using a suitable
dial indicator gauge and
holding fixture, CHECK the
lateral and radial runout of the
wheel and tire assemblies.
INSTALL new wheel and tire
assemblies as necessary.
REFER to:(204-04 Wheels and
Tires)
Specifications (Specifications),
Wheel and Tire (Removal and
Installation).
• Foreign material between • CLEAN mounting surfaces.
wheel mounting face and hub
mounting surface.
• Front wheel bearing. • CHECK or INSTALL new wheel
bearings as necessary.
REFER to:Wheel Bearing (204-
01 Front Suspension,
Removal and Installation).
2007.50 Transit 11/2006 G25362en
204-04-7 Wheels and Tires 204-04-7
DIAGNOSIS AND TESTING
Symptom Possible Sources Action
• Rust streaks from the wheel • Wheel nuts. • REMOVE the wheel and tire
stud holes in the wheel assembly. Inspect the wheel
nuts and wheel and tire
assembly for damage.
INSTALL new wheel nuts and
wheel and tire assemblies as
necessary. REFER to:(204-04
Wheels and Tires)
Specifications (Specifications),
Wheel and Tire (Removal and
Installation).
• Seized wheel nuts • Corrosion. • CAUTION: Do not permit
lubricant to get on cone sets of
stud holes or on cone angle of
wheel nuts. If corrosion is
slight, wire brush away. If
corrosion is excessive,
INSTALL new wheel studs and
nuts. REFER to:(204-04
Wheels and Tires)
Specifications (Specifications),
Wheel and Tire (Removal and
Installation).
If the condition persists,
LUBRICATE the first three
threads of each wheel stud with
a graphite-based lubricant.
• Vehicle overloaded • CORRECT as necessary.
2007.50 Transit 11/2006 G25362en
204-04-8 Wheels and Tires 204-04-8
REMOVAL AND INSTALLATION
Wheel and Tire
Removal
CAUTION:Do not use heat to loosen a
seized wheel nut. Heat may damage the
wheel and wheel hub.
1. Loosen the wheel nuts.
2. Raise and support the vehicle. For additional
information, refer to:(100-02 Jacking and
Lifting)
Jacking (Description and Operation),
Lifting (Description and Operation).
3. Remove the wheel and tire.
Installation
1.
WARNING:Remove any corrosion or dirt
from the mounting surfaces of the wheel,
wheel hub or brake drum. Corrosion or dirt
on the mounting surfaces may cause the
wheel nuts to loosen and the wheel to come
off while the vehicle is in motion. Failure to
follow this instruction may result in personal
injury.
Clean the wheel, wheel hub and brake drum
mounting surfaces.
2. Install the wheel and tire assembly.
3. Lower the vehicle.
4. Tighten the wheel nuts.
200 Nm
TIE0005679
2007.50 Transit 11/2006 G25363en
