[TR] Speedo Bouncing

[Johnnie Donnelly]

Thanks John, good advice.

I thought I'd take the simplest (and cheapest) approach first; clean the
cable. If that doesn't work, then certainly, it means pulling the speedo
and off to the instrument shop.

The calibration of the speedo was changed a few years ago based on the
tires, so I'm thinking that's it's really the cable at issue. But, your
comment about gunk inside the head unit causing the bounce opens another
possibility.

Thx, Johnnie

On Wed, Oct 25, 2017 at 4:42 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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