[TR] Speedo Bouncing

[Johnnie Donnelly]

Thanks Don!

Valuable document. I've printed it and it's going in my files.

Thx, Johnnie

On Wed, Oct 25, 2017 at 7:51 AM, Don Hiscock <don.hiscock at gmail.com> wrote:

> 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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>>
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