In a message dated 9/26/2003 10:21:17 PM Eastern Daylight Time,
pfullam@nycap.rr.com writes:
> 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.
Makes sense. Of course, the fact that a given part is listed in the SPC
doesn't necessarily mean that it was actually available and/or used, just as
absence of a listing for a given part doesn't necessarily mean it didn't
exist. ;-)
For those who care (or want to try to order the assemblies -- and to you I
say good luck), part numbers were, for the "Weight and Bush Assembly,
Vibration
Damper," 144314 for "Normal Condition" and 132604 for "Overdrive condition."
--Andy Mace
*Mrs Irrelevant: Oh, is it a jet?
*Man: Well, no ... It's not so much of a jet, it's more your, er,
Triumph Herald engine with wings.
-- Cut-price Airlines Sketch, Monty Python's Flying Circus (22)
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