Paul, another question for you on vibration. As I mentioned in my notes to
Joe, a heavy weighted steel object was strapped to the back of the
transmission tail shaft, I believe beginning with the introduction of the
TR-4A. I had always heard (or maybe just assumed) that it was some kind of
vibration damper. Could this have been part of the effort to reduce
vibration in the mid sixties? I have always removed them on the cars that
I have driven/raced without any apparent problem. Am I missing out on
something? Thanks.
-----Original Message-----
From: Paul Richardson [SMTP:Paul-Richardson@cyberware.co.uk]
Sent: Wednesday, April 07, 2094 8:47 AM
To: jwheeler@seidata.com
Cc: fot@autox.team.net
Subject: Fw: Memories of transmission vibration (Very high-tech!!)
Hi Jack
The jubilee clip cure was actually written in a supplement to the factory
Herald service and repair manual when I was an apprentice at the main
Triumph distributor in Coventry. Later, circa the mid sixties, trans. vibes
were still being cured thus at the London Service Department of Standard
Triumph. The words 'capital budget,' as far as expenditure on the Herald
was concerned, was mainly spent providing mechanics all over the UK with
waterproofs to check the waterleaks. - I learnt scuba diving in Herald
boots (trunks) whilst checking spare tyre pressures.
> From: Jack Wheeler <jwheeler@seidata.com>
> To: 'Paul Richardson' <Paul-Richardson@cyberware.co.uk>
> Cc: fot@autox.team.net
> Subject: RE: Memories of transmission vibration (Very high-tech!!)
> Date: 07 April 2000 13:01
>
> Paul, this is interesting history, but sounds quite dangerous and time
> consuming. I would have thought a prop-shaft balancing machine would
have
> been easy to justify as a capital budget project! Where were your bean
> counters when you needed them?
>
> -----Original Message-----
> From: Paul Richardson [SMTP:Paul-Richardson@cyberware.co.uk]
> Sent: Wednesday, April 07, 2094 2:20 AM
> To: fot@autox.team.net
> Subject: Memories of transmission vibration (Very high-tech!!)
>
> When the Herald came out it had many a problem including tranny vibration
> that could nearly shake the car to bits and open doors etc..
>
> The ' official factory cure,' if all else failed, involved the good old
> 'jubilee clip'.
>
> The rear of the car was jacked up and mounted on axle stands under the
> shocker mounts (for this procedure the suspension had to be loaded with
the
> wheels and brake drums removed). A jubilee clip was then fitted to the
rear
> of the prop shaft and by the following procedure adopted.
>
> The engine was run up by a 'driver' to about 50MPH on the speedo with the
> car in top gear - and dozens of stop start sequences were then needed to
> achieve prop balance. The jubilee clip was moved round the prop shaft so
as
> to achieve the least prop vibration (it was very rarely cured at this
> stage). Then a chalk mark was made on the prop shaft opposite the jubilee
> clip screw case. The clip was then moved round the prop shaft so the
screw
> case was 90 degrees from the chalk mark. A second J clip was then fitted
to
> the prop shaft next to the first so that the screw cases were 180 degrees
> apart. Then, often with dozens of starts and stops, both the J clips were
> moved by equal amounts towards the chalk mark to achieve perfect balance
(
> this was judged by diminishing body vibration).
>
> If vibration was still outside acceptable limits - the same damned
> procedure had to be carried out on the front end of the prop shaft.
> Sometimes this could be a damned dangerous opperation because the
> vibrations were sometimes so bad the axle stands would chatter about on
the
> workshop floor!!
>
> Another method we used involved a stroboscopic 'wheel balancing machine'.
> The car was put on a four poster ramp with the rear wheels jacked up etc.
> The balancing machine was positioned at the rear of the car so the strobe
> flash beam pointed to the front and aimed at the rear prop shaft uj. The
> flash pick-up (which was normally positioned under the front lower
trunion
> etc. for wheel balancing) was positioned to locate on the differential
case
> mounting bracket. The usual palaver with chalk marks and j clips then
> followed. Strobe observation of the chalk mark positions on the prop when
> the speedo registered 50 dictated jubilee clip positions - in conjunction
> with the 'in balance' needle reading on the strobe machine. Does this
help
> Joe???
>
> Paul
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