If your vibration control balancer has a Smart weight function Do Not use
this function when balancing Bentley wheel assemblies please only use
traditional balancing technology

•

Ensure Smart weight is not selected please refer to the manufacturers
operating instructions

Does the vehicle have accessory tyre valve caps fitted as shown in Figure 5? If Yes please ensure the force match and balance
process is always conducted with the accessory valve caps fitted
If No and the wheels are fitted with plastic valve caps these should still be fitted during the force match and balance process

Figure 5
•

Apply a thin smear of silicon based grease for example Dow Corning high vacuum grease to the external threads of the valve stem prior to
fitting the accessory valve cap. Grease should be applied any time the cap is removed and the grease is not evident

If during the RFV process you are prompted to measure the rim run out due to an out of specification assembly please adhere to all
points below
Please refer to workshop manual Rep.Gr 44 Tyres – checking condition and replacement – Radial Force Variation – Best fit practice to
ensure the following are confirmed and rectified
•

The wheel rim run out measurement is as per specification

•

The wheel rim run out process is strictly adhered to as per the manufacturers vibration control balancer operating instructions

•

It is recommended to measure the bare rim for accurate run out readings

Referring to Figure 6 (Point A) - After force matching and balancing the assembly must not exceed 85N (first harmonic)

Figure 6
Ensure after balancing the screen shows as (Point B) do not fit an assembly which does not show OK – OK for the inner and outer
balance weight adjustment
6. For Hunter GSP 9712 (or similar) use the White faced adaptor cone with identification code 154 F+ shown in Figure 7, NOTE: If your workshop
does not have this particular adaptor please contact your local Hunter representative
•

The cone must be fitted on the spindle as shown in Figure 8 ensuring the white face of the cone is facing towards the end of the spindle

•

IMPORTANT NOTE: Should the initial first harmonic reading be above 85N this does not necessarily mean the assembly cannot be adjusted
to the specified tolerance, please ensure that the force matching process is adhered to as instructed within the workshop manual Rep.Gr 44 –
Tyres – checking condition and replacement.

Figure 7

Figure 8
IMPORTANT: When conducting the wheel and tyre force matching process or the tyres require replacing, a specific tyre fitting lubricant should be
used. The lubricant is Rema Tip Top Anti Gliss Lube with the Bentley Part Number of RH 14530. On drying the Anti Gliss has adhesive properties that
increases friction between the tyre and wheel rim to prevent slippage.
•

Using a clean brush apply to the upper and lower tyre beads

•

Anti Gliss must also be applied to the entire circumference of the upper hump of the wheel rim (Figure 9 shows the upper hump and where the
Anti Gliss should be applied)

Figure 9
•

Every time the bead is broken any remnants of “Anti Gliss” should be cleaned off the wheel rim and the tyre bead
Ensure that all original balance weights and balance weight adhesive is completely removed from the wheel rim

Failure to remove weight adhesive could result in the application of the new weights in the same place resulting in poor contact between the weight
and rim resulting in the weight becoming detached from the rim which will affect the balance of the assembly

It is recommended to wear eye protection
•

To seat the tyre beads to the wheel rim inflate to a min of 3.5 Bar max of 4.2 Bar with the valve core removed (Figure 10), the removal of the
valve core allows the assembly to be inflated quicker than with the core fitted, which helps to seat the tyre bead to the rim evenly

Figure 10
Once satisfied that the tyre beads are seated correctly/evenly refit the valve core and readjust to the RFV measuring pressure of 3.0 Bar
- Referring to Figure 11 the assembly high spot is identified with a brown dash the first harmonic result (RFV) is shown in this example as 45N

Figure 11
-Rotate the assembly on the spindle until the high spot is at 12 o’clock and the brown dash turns to Green (Figure 12)

Figure 12
-Mark the assembly high point with a paint pen or similar (Figure 13) this will be required when refitting the wheels

Figure 13
In the event that any parts are required to be replaced using the latest specification, they should be fitted at this point prior to
refitting the wheels
13. Refit the road wheels refer to Workshop manual Rep.Gr 44 Tyres – Checking Condition and Replacement – Radial force variation – Best fit
practice
- Carry out a full front and rear geometry check and adjust as required including ACC where applicable - Refer to workshop manual - Rep.Gr 44
Wheels, tyres. axle align, please also refer to General Information - Adaptive Cruise Control (ACC)
IMPORTANT: The geometry check and adjust process is crucial to the whole process please ensure the process is fully adhered to including ‘S’ Point
adjustment (Raised toe adjustment)
•

It is essential the vehicle ride height is in specification when carrying out the vehicle geometry - Refer to workshop manual - Rep.Gr 44 Wheels,
tyres. axle align
Vehicle model

‘S’ Point toe constant

New GT - New GTC

Toe - in

10' ± 2'

10' ± 2' positive (per side)

5' ± 2'

10' ± 2' positive (per side)

Non Speed models
New GT and New GTC
Speed models

14. In ambient workshop temperature, ensure the engine and tyres have cooled down to ambient temperature and adjust the tyre pressure as
detailed
- Locate the tyre pressure label on the B-post (The label shown is fitted to a New Continental GTC and is for photographic purposes only)
- The tyre pressures should be the adjusted as per the tyre pressure label for speeds upto 200 km/h

IMPORTANT: In the event that brand new tyres have been fitted you must carry out
procedures 15 to 17
•

If the original tyres were used it is only a requirement to carry out procedure 17

•

The second road test on fitment of new tyres is only applicable when conducting this
TPI and should not be conducted if a customer requires new tyres for a non steering
shimmy/vibration complaint

15. NEW TYRES ONLY Conduct a second road test to evenly seat the beads to the rim, drive the vehicle for a minimum of 30 Km at 120 kp/h (where
permitted) this process is essential to allow the tyres to warm up to running temperature
16. NEW TYRES ONLY On return from the second road test repeat Section 1 procedures 1 to 6 to confirm the RFV and balance is within specification
- When refitting the wheels - Refer to Workshop manual Rep.Gr 44 Tyres – Checking Condition and Replacement – Radial force variation – Best fit
practice
17. NEW AND ORIGINAL TYRES Reassess the vehicle, the vehicle should be driven for a minimum of 20 Km at 90 kp/h (where permitted) 90 kp/h is
the most sensitive speed for steering shimmy/vibration validation

Warranty accounting instructions
Time to carry out the initial flat spot recovery process including force match and balancing all four assemblies
Warranty Type

910 or 110

Labour operation code

44 40 94 00

Damage Service Number

44 40

Damage code

00 13

Time

Shop Time

Time to replace Servotronic control unit (Where Applicable)
Warranty Type

910 or 110

Labour operation code

48 69 19 00

Damage Service Number

48 69

Damage Code

00 13

Time

10 Time units

Time to check and adjust the front and rear vehicle geometry without ACC
Warranty Type

910 or 110

Labour operation code

44 95 03 00

Damage Service Number

44 95

Damage Code

00 13

Time

80 Time units

Time to check and adjust the front and rear vehicle geometry with ACC
Warranty Type

910 or 110

Labour operation code

44 95 03 10

Damage Service Number

44 95

Damage Code

00 13

Time

150 Time units

Time to replace 2 Tyres.
Warranty Type

910 or 110

Labour operation code

44 40 56 00 *

Damage Service Number

44 40

Damage Code

00 13

Time

50 Time units

* Enter twice to allow 100 Time Units for the replacement of all 4 tyres
Road Test
Warranty Type
Labour operation code
Damage Service Number

910 or 110
01 21 00 00
01 21

Damage Code

00 13

Time

50 Time units

Parts information
Description

Part Number

Quantity

Servotronic control
unit

Refer to Production
change section of this
TPI

Refer to Production
change section of this
TPI

Anti Gliss

RH 14530

1 x 500 Gram tin can
be used for multiple
applications

Should tyres be required, All regions applicable to this TPI must source ty res locally please ensure the new tyres are of correct specification as detailed
within the Workshop Manual Rep.Gr 44 – Tyres - Checking, Condition and Replacement

Customer information
Bentley branded Tyre Cradles are available as an approved accessory – Part number JNV 018 927
The tyre cradles have been designed and manufactured specifically for Bentley providing simple and effective tyre protection.
Tyre flat spotting can be caused by medium to long term storage or from parking after a long drive, especially where the tyre experiences large
changes in temperature.
To prevent flat spotting, tyres need to be cooled in a controlled manner to enable the tyre to restore to a constant radius.
Made from a unique polymer that moulds to the shape of the tyre the new Bentley Tyre Cradles maintain the tyre shape whilst cooling and in storage.
The tyre cradles are easy to use, simply drive the car onto them in the desired parking area.
NOTE: The tyres can flat spot when the car is parked with the tyre pressures adjusted for speeds up to 200 km/h, however the flat spots should
drive out. To help prevent flat spotting it is recommended the pressures are adjusted for speed up to 270 km/h although ride comfort can be
compromised.
For best results relating to steering shimmy vibration the tyre pressures should be adjusted for speeds up to 200 km/h
The customer should be made aware that should they require to drive at higher speeds the pressure must be adjusted accordingly