Technical product information 2030348/3

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Technical product information
Topic

New Continental GT and GTC steering shimmy/vibration-21 Inch wheels only

Market area

Russische Federation (5RU) ,China 796 VW Import Comp . Ltd (Vico) , Beijing
(6796),Russian Federation 935 Volkswagen Group RUS (6935) ,United Kingdom E01
Bentley UK (6E01 ),Germany E02 Bentley rest Europe (6E02) ,Japan E03 Bentley
Japan (6E03) ,Australia E04 Bentley rest Asia and Australia (6E04) ,United States E05
Bentley USA and rest America (6E05)

Brand

Bentley

Transaction
2030348/3
No.
Level

EH

Status

Draft

Release
date
New customer code
Object of complaint

Complaint type

Position

Running gear-> Wheels, tyres, tyre pressure monitoring - visual appeal I surface -> >not
> Tyres -> Tyre tread
bump
specified<
Running gear-> Steering, power-assisted steering ->
Steer

Noise, vibrat ion->
vibrate

Running gear-> Steering system

functionality

Running gear-> Steering system

Noise, vibration

Running gear-> Steering , power-assisted steering

functionality

New workshop code
Object of complaint

Complaint type

Position

Running gear-> Wheels, tyres, tyre pressure
monitoring -> Tyres

component I consumables ->
unbalanced

rear right

Running gear-> Wheels, tyres, tyre pressure
monitoring -> Tyres

component I consumables ->
unbalanced

front
right

Running gear-> Wheels, tyres, tyre pressure
monitoring -> Tyres

component I consumables ->
unbalanced

front left

Running gear-> Wheels, tyres , tyre pressure
monitoring -> Tyres

component I consumables ->
unbalanced

rear left

Running gear-> Steering system -> Steering gear

Noise, vibration -> noise

Vehicle data
New Continental GT and GTC
Sales types
Type MY

Brand Designation Engine code Gearbox code Final drive code

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Chassis numbers
Manufacturer Filler Type Filler

MY

Factory From

c
c

SCB

*

3W

*

*

SCB

*

ZA

*

*

To

Prod from Prod to

Documents
Document name
master.xml

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Technical product information

Transaction No. : 2030348/3

New Continental GT and GTC steeri ng shimmy/vibration-21 Inch wheels
only

Customer statement I workshop findings
This TPI is only applicable to New Continental GT and GTC vehicles fitted with 21 Inch wheels. This
TPI is not applicable to vehicles fitted with 20 inch wheels. should 20 inch wheels be fitted please
raise a DISS ticket.

This TPI also applies to all vehicles which are built and registered for use in the following countries
listed below:
EGYPT - INDIA - LEBANON - SYRIA - SOUTH AFRICA
Should a customer complain of steering wheel shimmy/vibration constantly above 80 kph/50 mph and
the condition does not improve when driven please proceed with this TPI, should the vehicle exhibit
different symptoms other than described please raise a DISS ticket.

Should this be the first time the vehicle has been to your Dealership for steering shimmy/vibration
issues please carry out Section 1 only.
In the event the vehicle is returning back to your Dealership with the same steering wheel/shimmy
issue please carry out Sections 1 and 2.

NOTE If conducting Sections 1 and 2 it is not a requirement to carry out the road test in Section 1
procedure4

Technical background
We are aware that under certain conditions of shipment and storage, particularly involving large
changes in ambient temperature , cond ition can occur where the tread surface of the tyre forming the
footprint on the road surface or container floor partly reta ins the relatively flat form when driven and
does not immediately restore to a constant radius. Hence the name of flat spotting which is generally
given to this condition.
It should not be confused with out of balance, out of round or radial force variation. It is very important
that the diagnosis and correction of these different cond itions are not confused with each
other. Attempting to correct flat spotting by rebalancing the assembly will not correct the problem and
worse still, when the flat spots are removed the tyres will then be out of balance.
The Measure section of this TPI describes the procedure wh ich should be followed to determine the
root cause of the steering shimmy/vibration .
ATTENTION: Du ring this TPI the workshop manual is quoted to help in carrying out various tasks , it
is recommended that the procedures referenced are checked by the operative as the process within
the workshop manual may have changed since last viewed .·

Production change

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Improved shipping , transportation and prqduction procedures have been introduced.

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IMPORTANT INFORMATION
Right Hand Drive
the latest level higher friction steering rack and updated
From VIN SCBFE63WXCC
servotronic control units were fitted
Left Hand Drive
From VIN SCBFR7ZA3CC
servotronic control units were fitted

latest level higher friction steering rack and updated

Right and Left Hand Drive
From VIN SCBFN63W8DC
time of production

latest specification wheel bearing housings were fitted at the

Measure
Section 1
IMPORTANT: Do Not initially balance the wheel and tyre assemblies
- Check all wheels and tyres for damage
- Check that Bentley 21 inch approved wheels are fitted and the tyres are to the correct specification
- Check the front and rear suspension for any damage and wear
- Check all steering components for damage and wear
1. Ensure the tyres are set at Normal pressure and adjust if required, drive the car until the flat spots
come out or the flat spotting condition improves, then drive for approximately 10 minutes at the lowest
speed possible to allow cooling
- Within a maximum of two minutes of returning from the road test , raise the vehicle off the ground
2. Remove all four wheel assemblies Refer to Workshop manual Rep.Gr 44
3. Using the Hunter GSP 9712 (VAS 6230) vibration control balancer (or similar) force match and
balance all four assemblies, the assembly Rad ial Force Variation (RFV) should not exceed 85N after
the force matching process has been conducted.
- To seat the tyre beads to the rim inflate to 3.5 Bar, once satisfied that the tyre beads are fully seated
readjust to the correct measuring pressure of 3.0 Bar - Refer to Workshop manual Rep.Gr 44 and
also observe the following key points

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Does the vehicle have accessory valve caps fitted as shown in Figure 1? If Yes please ensure the
force match and balance process is always conducted with the accessory valve caps fitted.

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Figure 1
IMPORTANT: 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

- For Hunter GSP 9712 (or similar) use the White faced adaptor cone with identification code 154 F+
shown in Figure 2, 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 3 ensuring the White face of the cone is
facing towards the end of the spindle
IMPORTANT NOTE: Should the initial RFV reading be above 85 N this does not necessarily mean
the assembly cannot be adjusted to within 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.

All four tyres must not exceed 85N after force matching and balancing should this not be achievable
replace the applicable tyres - Refer to Workshop manual Rep .Gr 44

Figure 2

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Figure 3
IMPORTANT: When conducting the wheel and tyre force matching process or should 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. Please Refer to
Workshop manual Rep.Gr 44 Tyres - Checking Condition and Replacement - Radial force variation Best fit practice.

- The assembly high spot is identified with a brown dash (Figure 4).

Figure 4
- Rotate the assembly on the spindle until the high point is at 12 o'clock and the Brown dash turns to
Green (Figure 5).

Figure 5

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- Mark the RFV high point with a paint pen or similar (Figure 6) this will be required when refitting the
wheels as detailed within the Workshop manual Rep .Gr 44 Tyres - Checking Condition and
Replacement - Radial force variation - Best fit practice

Figure 6
4. Carry out a road test and reassess. Should the steering shimmy/vibration condition not
improve please complete Section 2.

Section 2
1. Remove and discard the original front left and right hand side wheel bearing housing (Figure
7 point A) and replace with 3WO 407 245A - left hand front and 3WO 407 246A - right hand
front - Refer to workshop manual Rep.Gr 40 Front suspension , Drive shafts

Figure 7
- Fit new front hub bearing assemblies and fixings (Figure 7 point 8) - Refer to workshop
manual Rep.Gr 40

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Have the steering rack and servotronic control unit been previously replaced using the latest