[TR] Speedo Bouncing

[John Macartney]

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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