Tires/Wheels - 18 Inch Wheel Vibration
ISSUE 203/07/97
74/01/96/US
SUBJECT:
PRIDE - 18" Wheel/Tire Vibration
MODEL:
Range Rover 4.0/4.6
AFFECTED VEHICLES:
* LP ALL
LH
LJ
LD *
Updated sections are noted by asterisks.
DETAIL
The 18" wheel and tire combination specified on the Range Rover (and the accessory 18" wheel and tire) are more sensitive to imbalance than other Land Rover wheels. They are also more difficult to balance.
This procedure covers the most significant issues affecting wheel vibration; however, not all drive train vibrations emanate from wheel imbalance. It can be difficult to differentiate between wheel balance and
other issues. Properly balanced wheels are the first step in the process for diagnosing a vibration concern. Drive train vibration is covered in a separate bulletin.
The diagnostic steps and repair procedures detailed in this bulletin were developed as an element of the Land Rover Way OPERATION PRIDE. This TIB provides a library location for PRIDE information within the Land Rover North America technical literature system.
ACTION REQUIRED
Upon customer complaint for the symptoms outlined, perform the specified repairs.
* PARTS INFORMATION
LRNABAL28 - Balance Kit (28 mm center)
LRNABAL40 - Balance Kit (40 mm center)
Optional Items
NOTE:
If you need to adapt to a center size other than 28 mm or 40 mm, order from LRNA the 40 mm arbor and a sleeve to adapt it to the size required.
LRNASLVxx - Adapter sleeve
(Insert desired ID figure for "xx" in the part number)
Available adapter sleeves have internal diameter
dimensions of 30, 35, 36 and 38 mm.
NOTE:
Please allow up to 6 weeks for delivery of special order adapter sleeves.*
PROCEDURE
Perform the diagnostic procedures and repairs outlined for the repair of 18" wheel/tire Vibration.
WARRANTY:
Normal warranty procedures and policies apply.
COMP.CODE:
SRO:
74.20.89/27 Time: 1.65 hrs
Measure radial run-out and balance wheels (vehicle set)
74.20.89/26 Time: 0.2 hr.
Remount tire and index rim
1. Removal of tire flat spots prior to balancing
Flat spots on the tire will develop when the vehicle has been stationary for as little as 5 minutes. It is essential that any flat spots are eliminated before the wheel/tire assembly is balanced. This should be done by driving the vehicle for a minimum of 10 minutes and raising the vehicle off the tires immediately upon return to the workshop.
2. Wheel mounting on the balancer
Due to the weight and size of the assembly, use of a regular cone mount is insufficient to ensure accurate location of the wheel on the balancer. In order to guarantee correct mounting, it is necessary to center the wheel (using a centering sleeve) on the pilot diameter on the rearward face of the wheel. To ensure that the wheel is correctly positioned against the balancer flange, use a five stud flange adapter plate and position it into the wheel nut holes on the front face of the wheel (figure 1).
It is important to validate that the correct balance has been achieved by repositioning the wheel on the balancer and spinning. The wheel will be correctly balanced if the results are repeatable in any position.
A flange plate adapter has been developed which is suitable for use on the Range Rover (with 5 studs on a 120 mm Pitch Circle Diameter (PCD). This is available as part of a kit containing:
^ 1 flange plate
^ 1 centering sleeve (for Range Rover alloy wheels)
^ 5 studs
^ 1 instructional video
This kit contains all parts necessary for optimum balancing of Range Rover alloy wheels.
3. Weight location on the wheel
* Two designs of the 18 inch wheel, 4.6 HSE (ANR4274MNH) and accessory wheel (STC8516) do not allow use of balance weights on the outboard (visible) rim. The self-adhesive balance weights must be applied to the inboard surface but positioned as far outboard as possible. The weight for the inboard rim is positioned as normal. The wheel balancer should be set to reflect the position of both inner and outer plane. More weight will be required for balance using this outer plane than if outboard rim weights could be used but successful balance can be achieved. Ensure that the wheel surface is clean to allow a good bond to the self-adhesive weight and to minimize the risk of detachment during use.
NOTE:
From VIN VA349734 a revised design of 18 inch alloy wheel (ANR6316MNH) is fitted which uses hammer on weights on the inner and outer rims. Although this new 18" wheel is similar in appearance to the old wheel, it is essential that the old and new versions of the wheel are not mixed on the same vehicle due to visual and weight differences between them. It is not necessary to update vehicles to the new wheel.*
4. Radial run-out of the entire tread surface
The radial run-out specification for the wheel/tire assembly allows up to 3 mm radial run-out measured at the tire tread surface. when the wheel/tire assembly is rotating on the wheel balancer, look for obvious radial run-out. The radial run-out should be measured using a dial gauge if run-out in excess of the specification is suspected. If radial run-out of more than 3 mm is measured, the tire should be rotated on the rim to minimize the assembly run-out by off-setting the rim run-out against the tire run-out.
5. Slippage of the tire on the wheel rim
In rare cases, slippage of the tire on the wheel rim has been reported. Therefore, it is important that the tire and inner wheel rim are clean and that a proper tire mounting paste is used (i.e. Wurth 0892 800), Mark the wheel rim and tire to determine if there is any relative movement between them.