I called Mike Esposito at Quantum today on another matter, and the
vibration damper question came up. He says that the dampers were unique
to non-overdrive TR4s only. They had a resonance in the gearbox or
tailshaft. This was not a problem with TR3s, 250s or 6s, nor TR4s with
O/D. The mass of the O/D changed the natural frequency enough that the
resonance disappeared.
The message seems to be if you had a TR4 with O/D and swapped in a
non-O/D gearbox, you maybe ought to chase up a damper for it.
Cheers,
Pete Fullam
CT19207L, to become LO later
ZoboHerald@aol.com wrote:
>In a message dated 9/25/2003 9:20:44 PM Eastern Daylight Time,
>ryoung@navcomtech.com writes:
>
>
>
>>The legend handed down to me was that it was the factory's attempt to cure a
>>buzzing of the gearshift lever under some circumstances. Don't know if
>>that's true or not, but I've seen the same arrangement on another 63 TR4, a
>>parts car I bought many years ago just to get the OD.
>>
>>
>
>The damper IS listed in the TR4A Spare Parts Catalogue, although not shown in
>the accompanying picture. There are different ones for OD and non-OD
>gearboxes. Sorry I didn't write down the part numbers. It is NOT listed in the
>First Edition of the TR4 SPC, although it might be in later editions of same.
>
>--Andy Mace
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