Land Rover Discovery: Wheels and Tires / Diagnosis and Testing

PRINCIPLES OF OPERATION

NOTE:

Check DDW for open campaigns. Refer to the corresponding bulletins and SSMs which may be valid for the specific customer complaint and carry out the recommendations as required.

For a detailed description of the Wheels and Tires refer to the relevant description and operation section in the workshop manual.

TIRE CHIP & CHUNK

NOTE:

If the level of chip and chunking is excessive or overall tire condition is poor the tire should be treated as any damaged/punctured tire.

Where detrimental damage to the tire is evident, it must be reported to the customer with recommendations to accordingly replace damaged tires.

Symptoms

Typical example of a serviceable tire exhibiting chip and chunk phenomenon

Possible Causes:

Tire Chip and Chunk is a phenomenon that may develop on the tire tread when vehicles are driven on rough gravel or aggressive road surfaces.

Typically the tread may lose small pieces of tread rubber within and around the periphery of the tread block. This loss of rubber ultimately leads, with extended usage, to an overall rough appearance to the tread area of the tire.

Action:

When a customer contacts a retailer concerning the chip and chunk phenomenon, dealers must:

• Conduct a thorough evaluation of the tire condition and, where no detrimental damage has occurred, inform the customer that the chip and chunk condition does not affect the overall tire integrity or significantly affect performance
• Inform the customers of the conditions that generate chip and chunk phenomenon

Complaints associated with this phenomenon must initially include a thorough examination of the vehicles tires for the following:

• Excessive chip and chunk (tread cuts or loss of tread block section, extending deep into the tread rubber beyond the tread wear indicators or in the shoulder area extending beyond the groove depth)
• Cuts and bulges especially within the sidewall
• Overall tire condition including tread depth.

Where the tires do not exhibit excessive chip and chunk, cuts, sidewall bulges and are in generally good condition the customer should be advised that the condition does not affect the overall tire integrity or significantly affect performance and as such are serviceable.

TIRE FLAKING

NOTES:

• If the level of tire flaking is excessive or overall tire condition is poor the tire should be treated as any damaged/punctured tire. Where detrimental damage to the tire is evident, it must be reported to the customer with recommendations to accordingly replace damaged tires.
• Perform a tread depth measurement to make sure the tire is within local regulations. If specifications are not met inform customer that they require replacement.

Symptoms

Typical example of a serviceable tire exhibiting tire flaking phenomenon

Possible Causes:

Tire Flake damage may develop on the outer sections of the tire tread when vehicles are driven enthusiastically and peak available grip has been surpassed. Typically the tread may lose small pieces of tread rubber within and around the periphery of the tread blocks on the outer sections of the tire.

Action:

When a customer contacts a retailer concerning the tire flaking phenomenon, dealers must:

• Conduct a thorough evaluation of the tire condition and determine that they are seeing flake damage on the outer sections of the tire. If damage is seen in the central tread, please refer to the Tire Chip & Chunk section
• Inform the customers of the driving styles that generate tire flaking (Mid corner understeer that generates high pitched tire noise, and/or over application on throttle inputs when exiting junctions that cause the traction control light to come on).

Complaints associated with this phenomenon must initially include a thorough examination of the vehicles tires for the following:

• Excessive flaking (tread cuts or loss of tread block section, extending deep into the tread rubber beyond the tread wear indicators or in the shoulder area extending beyond the groove depth)
• Cuts and bulges especially within the sidewall
• Overall tire condition including tread depth.

Where the tires do not exhibit excessive flaking, cuts, sidewall bulges and are in generally good condition the customer should be advised that the condition does not affect the overall tire integrity or significantly affect performance and as such are serviceable.

DTC INDEX

For a list of Diagnostic Trouble Codes (DTCs) that could be logged on this vehicle, please refer to Section 100-00.

Wheels and tires - specifications

Wheel Type

CAUTION:

With reduced size spare wheel fitted, do not exceed 50 mph (80 km/h) and replace with standard size wheel at earliest opportunity.

Tire Sizes - Standard Fit

CAUTION:

Inner tubes must not be fitted with any of these tires.

Tire Pressures

NOTE:

0 - 209 KPH (0 - 130 MPH)

** Normal operating conditions: Carrying up to 4 passengers and luggage

Recommended Lubricant

Torque Specifications

* Road wheel nuts must be tightened by diagonal selection

Wheels and tires - tire low pressure sensor (G1348307)  Removal and installation

PART(S)

REMOVAL

CAUTION:

If a new sensor is installed, make sure that the sensor frequency is the same as the sensor that has been removed. Failure to follow this instruction may result in the system malfunction.

NOTES:

• Removal steps in this procedure may contain installation details.
• Some variation in the illustrations may occur, but the essential information is always correct.

WARNING:

Make sure to support the vehicle with axle stands.

Raise and support the vehicle.

Refer to: Wheel and Tire (204-04 Wheels and Tires, Removal and Installation).

Remove the tire from the wheel, release the tire bead from the rim 180 degrees from the valve.

• Discard the tire valve and retaining nut.

INSTALLATION

CAUTIONS:

• Make sure that the seal is correctly located.
• Make sure that new components are installed.

Install the washer and seal, making sure the valve remains pressed fully onto its seat.

WARNINGS:

• Make sure that any corrosion or dirt is removed from the mating surfaces.
• Make sure that a new tire valve, valve core, seal, washer, cap and retaining nut is installed.

CAUTIONS:

• Use lint free cloth.
• Only use moderate force when installing the sensor.

NOTE:

Only tighten the nut finger tight at this stage.

1. Install the tire low pressure sensor and support the sensor body in position.

   Renew Part: Tire pressure monitoring system sensor seal kit.

2. Support the back of the valve stem in order to prevent rotation to the tire low pressure sensor body.
3. Gently push the nut towards the center of the wheel.

Tighten the nut.

Torque: 8 Nm

Install the tire and balance the wheel.

Refer to: Wheel and Tire (204-04 Wheels and Tires, Removal and Installation).

WARNING:

Make sure to support the vehicle with axle stands.

Lower the vehicle.

Wheels and Tires - DescriptionWheels and Tires - Tire Pressure Monitoring System Locsync

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