Jaguar X-Type Sedan and Estate (Wagon). Manual - part 47
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Mechanical
Bulges (blister)
Ply separation
Embedded objects
Impact damage
Incorrect speed rating
Incorrect load rating
Incorrect rotational direction
3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next
step.
3.
4. If the concern is not visually evident, verify the symptom and refer to Symptom Chart.
4.
Tire Wear Inspection
To maximize tire performance, inspect the tires for signs of incorrect inflation and uneven wear which may indicate a need for balancing,
rotation or front suspension alignment. Tires should also be checked frequently for cuts, stone bruises, abrasions, blisters, and for objects
that may have become embedded in the tread. More frequent inspections are recommended when rapid or extreme temperature changes
occur or when road surfaces are rough or occasionally littered with debris.
Tire Wear Diagnosis
New tires should be installed if the wear indicators are exposed or if there is severe shoulder wear. Shoulder wear is usually caused by
either excessive camber or excessive toe on radial tires.
Sometimes incorrect rear toe settings or damaged struts will cause severe cupping' or scalloped' tire wear on non-drive wheels.
Incorrect rear toe alignment will also cause other unusual wear patterns.
Road Test
A tire vibration diagnostic procedure always begins with a road test. The road test and customer interview (if available) will provide much of
the information needed to find the source of a vibration.
During the road test, drive the vehicle on a road that is smooth and free of undulations. If vibration is apparent, note and record the
following:
The speed at which the vibration occurs.
What type of vibration occurs in each speed range.
- mechanical or audible.
How the vibration is affected by changes in the following:
- engine torque.
- vehicle speed.
- engine speed.
Type of vibration-sensitivity: torque sensitive, vehicle speed sensitive or engine speed sensitive.
The following explanations help isolate the source of the vibration.
Torque Sensitive
This means that the condition may be improved or made worse by accelerating, decelerating, coasting, maintaining a steady vehicle speed
or applying engine torque.
Vehicle Speed Sensitive
This means that the vibration always occurs at the same vehicle speed and is not affected by engine torque, engine speed or the
transmission gear selected.
Engine Speed Sensitive
This means that the vibration occurs at varying vehicle speeds when a different transmission gear is selected. It may sometimes be isolated
by increasing or decreasing engine speed with the transmission in NEUTRAL or by stall testing with the transmission in gear. If the
condition is engine speed sensitive, the cause is probably not related to the tires.
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.
A thumping noise usually means that the tire has a flat or soft spot making a noise as they slap the roadway. Tire whine may be
distinguished from axle noise. Tire whine remains the same over a range of speeds.
Symptom Chart
Symptom
Possible Sources
Action
Tires show excess wear on edge
of treads
Tires under-inflated
Correct pressure to specification.
Vehicle overloaded
Correct as required.
Tires show excess wear on edge
of treads (having the correct tire
pressures).
Incorrect toe setting
Set to specification. For additional information refer
toSection
204-00 Suspension System - General
Information
Tires show excess wear in center
of tread.
Tires over-inflated
Correct pressure to specification.
Other excessive tire wear
problems
Incorrect tire pressure
Correct pressure to specification.
Incorrect tire / wheel usage
Install correct tire and wheel combination.
Loose or leaking dampers
Tighten or install a new as necessary. For
additional information refer toSection
204-01 Front
Suspension
or Section
204-02 Rear Suspension
.
Geometry out of alignment
Check and adjust.
Loose, worn or damaged suspension components
Inspect, repair or install a new as necessary.
W heel and tire assembly out of balance
Balance wheel and tire assembly.