Summary
This technical service bulletin addresses a steering shimmy/vibration issue in Bentley Mulsanne vehicles fitted with 21-inch wheels, particularly in the USA market.
The issue is caused by flat spotting of the tyre tread surface, which can occur during shipment and storage, leading to a condition where the tread surface does not immediately restore to a constant radius.
Solution
The solution involves checking the tyre specification and date of manufacture, ensuring correct tyre pressure, and performing a force matching and balancing process on the wheel and tyre assemblies.
The bulletin also provides guidance on replacing the steering rack and front suspension lower lever assemblies, as well as incorporating additional snubber parts into the assembly.
Manual:
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