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Avery Wise
New User
Username: hans3

Post Number: 23
Registered: 08-2017
Posted on Wednesday, 22 July, 2020 - 12:07:   Edit PostDelete PostView Post/Check IP

On both an SY and SZ I've observed my under-floorpan spare tire tray lowering itself (via vibration on the screw rod) in just a few hundred miles, if that. Is there a TSB or preferred means for keeping the screw rod under more tension? I suppose a sufficiently large lock washer could suffice.
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David Gore
Moderator
Username: david_gore

Post Number: 3744
Registered: 04-2003
Posted on Wednesday, 22 July, 2020 - 13:58:   Edit PostDelete PostView Post/Check IP

Avery,

I would be looking for the source of the vibration to eliminate the cause rather than trying to stop the retaining screw self-undoing.

I would be concerned about future problems lowering the spare wheel when needed associated with the use of high-torque retention.

I would be looking at the following areas for the cause:

1. Out-of-balance wheels or tyre tread separation.

2 Misaligned drive shafts due to self-levelling system not functioning/coil spring misalignment/spring bottom retainer corrosion.

3. Worn Detroit trunnions [swap sides if they are still in their original delivery locations].

4. Worn wheel bearings [most difficult replacement]

.
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michael vass
Frequent User
Username: mikebentleyturbo2

Post Number: 682
Registered: 07-2015
Posted on Wednesday, 22 July, 2020 - 17:56:   Edit PostDelete PostView Post/Check IP

Hi Avery
Add to David's list
5 bad spheres, hard suspension
Mike
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Avery Wise
New User
Username: hans3

Post Number: 24
Registered: 08-2017
Posted on Wednesday, 22 July, 2020 - 21:27:   Edit PostDelete PostView Post/Check IP

Thanks for the replies but there's no discernible vibration or abnormal vibration in the car--the car rides fine. I have to presume it's some sort of subtle vibration that's causing this well-oiled rack screw to turn on its own. There's no secondary retaining mechanism for the screw (by design), hence my question regarding TSBs or improvisations.
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Robert J. Sprauer
Frequent User
Username: wraithman

Post Number: 628
Registered: 11-2017
Posted on Wednesday, 22 July, 2020 - 22:24:   Edit PostDelete PostView Post/Check IP

TSB's are on the Bentley Heritage site.
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David Gore
Moderator
Username: david_gore

Post Number: 3745
Registered: 04-2003
Posted on Thursday, 23 July, 2020 - 08:37:   Edit PostDelete PostView Post/Check IP

I had this problem for a short period of time with DRH14434 which had been fitted with Avon tyres in the UK before shipment to Australia - fixed by having all wheels dynamically balanced and adjusting the rear ride height control settings so the drive shafts were horizontal at all times.
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Trevor Hodgekinson
Experienced User
Username: wm20

Post Number: 187
Registered: 11-2006
Posted on Friday, 24 July, 2020 - 22:05:   Edit PostDelete PostView Post/Check IP

To stop bit falling off vintage motorcycles the usual trick is to put an O ring under the fasteners if they are applying a critical load.
In theory the tyre should be damping out the vibrations
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Patrick Lockyer.
Grand Master
Username: pat_lockyer

Post Number: 2338
Registered: 09-2004
Posted on Saturday, 25 July, 2020 - 05:21:   Edit PostDelete PostView Post/Check IP

In theory the tyre should be damping out the vibrations


Only if it is the correct size and inflated correctly.

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