[TR] Speedo Bouncing

Don Hiscock don.hiscock at gmail.com
Wed Oct 25 08:51:22 MDT 2017


This original Smiths document on the care of their instruments is a useful
reference:
http://vintagebritishcables.com/The-Care-of-SMITHS-Instruments.php


On Wed, Oct 25, 2017 at 6:42 AM, John Macartney <
john.macartney at ukpips.org.uk> wrote:

> Sounds like a combination of two probs:
>
>
>
>    1. Dirty cable in a dirty outer sheath. I’d wash the inner drive cable
>    in a degreaser, then when dry, pull the cable several times across the palm
>    of your hand into which there is a small puddle of lightweight machine oil
>    – 3 in 1 is ideal. Then refit with a new outer sheath or the original one,
>    as long as it’s very clean inside. Of course, you could fit a new inner
>    cable and outer cable sheath but lube the cable as suggested before fitting.
>    2. Needle bounce is often caused by dirt and old lube contaminating
>    the speedo head. May be sensible to send off the whole speedo assembly for
>    professional cleaning and possible repair
>    3. Optimistic/pessimistic speedo reading. Are your tyres likely to
>    have a different rolling radius to the original spec? Is the gearbox speedo
>    drive damaged or even a non-original item with different gearing?
>
>
>
> Jonmac
>
>
>
> *From:* Triumphs [mailto:triumphs-bounces at autox.team.net] *On Behalf Of *Johnnie
> Donnelly
> *Sent:* 25 October 2017 03:45
> *To:* Triumphs <triumphs at autox.team.net>
> *Subject:* [TR] Speedo Bouncing
>
>
>
> I know this has been discussed before, but thought I'd ask again.
>
>
>
> My speedo needle bounces, or shows 80 when I'm doing 60. So, before going
> to the extremes of pulling the speedo for repair I thought I'd R&R the
> cable.
>
>
>
> What's the best way to do this? Cleaning process? Which grease? Does
> adding graphite help?
>
>
>
> Johnnie
>
> Wondering how fast I'm going in my '67 TR4A
>
>
>
>
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