Jump to content

Recommended Posts

Hello, does anyone know of a source of speedometer internal components?

I'm looking for a small white plastic gear which is located inside the speedo. There are 2 gears inside which are worm-driven, and one of them has cracked, which I'm pretty sure is the cause of my annoying needle flicker.

I'd be interested to know if anyone else has had the same problem?

I discovered the cracked gear during my investigation into the needle flicker. First I checked the speedo cable, which was in good condition. Then I rotated the speedo drive directly into the speedo with an electric drill, and this gave a steady needle. That stumped me at first because there was no obvious cause, but then I rotated the drive with a small screwdriver and noticed it was stiff to turn roughly every 20 rotations. So then I took the speedo apart to try to find what was causing the stiffness and eventually spotted a slight crack in one of the gears which must be increasing the gear tooth pitch and therefore causing the worm drive to jam slightly every time the crack passed it.

Anyway, so that's why I'm looking for a replacement gear!!

Any suggestions of a source of replacement gears will be much appreciated.

Alternatively does anyone have a speedo for sale?. Working or not working (I just need the gear out of it).

Link to post
Share on other sites

Hi Bob,

you could try ebay. I think any of the TR series speedo's (except the 7) will have that gear.

Or you could try the Speedo repair people -

Speedy Cables https://speedycables.com/

JDO http://www.jdo1.com/

Caerbont Instruments http://www.caigauge.com/

 

The MG&TRiumph restoration show is on this coming Sunday at Stoneleigh - lots of stuff there.

 

Roger

Edited by RogerH
Link to post
Share on other sites

Hi Roger,

Thanks for the info.

I asked Speedy Cables and they dont sell parts but would overhaul it for £110.

But in the meantime I got my Dremmel with a very thin diamond grinder tip and opened up the gear slots either side of the crack in the gear.

This seems to have done the trick, and the worm drive now runs smoothly for the complete revolution of the gear.

I will know for certain whether this has fixed the jumpy pointer when I get the car back on the road.....

John

Link to post
Share on other sites

The car's back on the road and I can confirm that the needle flicker has been fixed. The speedo needle is now completely steady.

So the cause of my needle flicker was a crack in one of the white plastic toothed gears inside the speedo.

Hope this info is useful for anyone else trying to find the cause of speedo needle flicker....

John

Link to post
Share on other sites
  • 11 months later...

Thought I'd just bring this one back up, my needle bounces around at 40 or above, and also the trip doesn't work. Upon checking the speedometer, I can see the trip worm driven gear has seized and then stripped which is my the trip doesn't rotate, I'm hoping that removing it will steady my needle too. It seems a shame to not be able to replace that gear/shaft to restore the trip counter, I guess I could look out for a repairs only speedometer.

Gareth

Link to post
Share on other sites

I've just been on the phone to Alan, and he thinks he'll be able to sort one out, thanks for reminding me of his details

Gareth

Link to post
Share on other sites
1 hour ago, Mk2 Chopper said:

I've just been on the phone to Alan, and he thinks he'll be able to sort one out, thanks for reminding me of his details

Gareth

I'd recommend a minute or two on google regarding this chap

 

Link to post
Share on other sites
On ‎2‎/‎6‎/‎2018 at 8:41 PM, RogerH said:

Hi Bob,

you could try ebay. I think any of the TR series speedo's (except the 7) will have that gear.

Or you could try the Speedo repair people -

Speedy Cables https://speedycables.com/

JDO http://www.jdo1.com/

Caerbont Instruments http://www.caigauge.com/

 Hi Bob,

The MG&TRiumph restoration show is on this coming Sunday at Stoneleigh - lots of stuff there.

Roger

Hi Bob!

Caerbont Instruments http://www.caigauge.com/    This would be my first port of call as they make Repro Smiths instruments using original tooling!

Bruce.

 

 

 

Link to post
Share on other sites
On 2/11/2019 at 6:45 PM, iani said:

I'd recommend a minute or two on google regarding this chap

 

I delivered and picked up the gauges by hand as live nearby.

They were away for quite a time, few weeks, this did not worry me as car is being restored.

Have to admit he was not the easiest person to get hold of, either via email or phone.

However a great job was done at good price.

Hope this helps

 

Dave

Link to post
Share on other sites
53 minutes ago, cookie said:

I delivered and picked up the gauges by hand as live nearby.

They were away for quite a time, few weeks, this did not worry me as car is being restored.

Have to admit he was not the easiest person to get hold of, either via email or phone.

However a great job was done at good price.

Hope this helps

 

Dave

He let me down, he let folk on the SoC forum down, he let folk on the E-type forum down and if you search on here he’s let TR folk down, that’s before looking at the other groups he’s slated in online, up to you obviously but given you say he’s hard to get hold of why not use someone else?

Link to post
Share on other sites

Just to add to this - I've used one of the above suppliers not Alan I used them twice now never again on both occasions I heard absolutely nothing from the company. On the first occasion after all my TR6 guages being away for over 6 months I thought they were gone forever, the company didn't know where they were but they did have them they told me and I would be getting them back after 2 weeks mmm anyway 3 months later I finally got them. Second occasion different guages away for 6 months-- again with no correspondence no customer service then out of the blue I get a call to say they're ready--appalling service and its a big concern as I can send parts over to USA and have them back within 2 weeks and this hasn't happened just the once but on at least 3 occasions with our American cousins. 

 

Michael

Edited by michaeldavis39
Link to post
Share on other sites
On 2/11/2019 at 6:45 PM, iani said:

 

 

I have bought gears from JDO to repair Rolls Royce speedos. Expensive but great service and they worked a treat.

Cheers John

Quote

 

 

Edited by John390
Link to post
Share on other sites
  • 2 weeks later...

Wanted to update this, I ordered the 22t white gear from a German company advertising on ebay. 

Pretty easy to fit, though there was a tight spot, so when testing with a drill the needle would dip at the point of the tight spot. I cleaned out the gear at that point with a knife till I couldn't feel and resistance when turning the speedo over by hand.

Also the trip now turning again also created a small amount of resistance so after a clean and lube it runs steady, slightly less so in the car so I need to lubricate the cable also, slightly undoing it from the speedo has made it better so perhaps I need to take a little material off the end of the cable? 

The last thing was to clean the glass and paint the bezel and some new seals. Just the other five gauges left to do!

GarethIMG_20190211_175902_157.thumb.jpg.4eacbf1e45f0f35e1c112fb5fcb1261c.jpgIMG_20190216_221848_029.thumb.jpg.dff8b4550cf60b5f3b372877d821ed13.jpgIMG_20190218_161113_602.thumb.jpg.f5a1933f47c83f6be06335b01fd91d8d.jpgIMG_20190222_183646_563.thumb.jpg.39fee8d2e3f4634ca6185900d32aeaf1.jpg

Edited by Mk2 Chopper
Link to post
Share on other sites

My speedometer was overhauled/recalibrated by Speedograph Richfield in Nottingham 30 years ago and has not given a moment's trouble since. The needle is rock steady and according to a satnav is spot on up to 70mph (probably above this speed also but I wouldn't know about that). The odometer is within 1.5% when checked against km posts on a long stretch of motorway. Based on my experience in the unlikely event that I should I ever need such attention in the future I would not think of going anywhere else.

Tim

Link to post
Share on other sites
  • 2 years later...

I'm cleaning up my guages with new bezels and touched up paint, generally all working well pre-restoration. When I opened up the speedo I noticed the small red plastic cogs (1 either side) have identical splits in them. The speedo seems to function ok, but what is the purpose of these red cogs, they don't lookas though they are meant to move??? If I need specialist help, given the above comments in earlier threads, who is recommended?

Many thanks

David

DSC_0728.JPG

Link to post
Share on other sites

The cogs drive an eccentric that moves a pawl that moves the odometer gears- one for the main odometer and one for the trip odometer. If they are split or a tooth is stripped here are 2 vendors that sell replacements. Until a few years ago, I don't think anyone was reproducing them and the only source was cannibalizing's other speedometers. I think your gears have 20 teeth, but count them.

https://www.plastikzahnrader.com/jaeger-smiths.html 

https://www.odometergears.com/products/Smiths-Jaeger/All/38 

Berry

Link to post
Share on other sites
On 2/12/2018 at 9:08 AM, Cometbob said:

The car's back on the road and I can confirm that the needle flicker has been fixed. The speedo needle is now completely steady.

So the cause of my needle flicker was a crack in one of the white plastic toothed gears inside the speedo.

Hope this info is useful for anyone else trying to find the cause of speedo needle flicker....

John

Speedo flicker can also be caused by a dry inner speedo cable that has no grease lub? As I once found out!

Bruce.

Link to post
Share on other sites
16 hours ago, astontr6 said:

Speedo flicker can also be caused by a dry inner speedo cable that has no grease lub? As I once found out!

Bruce.

Yes it fixed my wobbly needle as well, but since doing it the speedo consistently under reads by 4mph now.:(

Link to post
Share on other sites
1 hour ago, DRD said:

Yes it fixed my wobbly needle as well, but since doing it the speedo consistently under reads by 4mph now.:(

That could be down to your tyre size wall depth when compared to factory sizing, which might affect number of revolutions per mile? Normally they over read by around 10% if anything. But you can always have the speedometer  recalibrated.

Kevin

Link to post
Share on other sites
13 minutes ago, boxofbits said:

That could be down to your tyre size wall depth when compared to factory sizing, which might affect number of revolutions per mile? Normally they over read by around 10% if anything. But you can always have the speedometer  recalibrated.

Kevin

No I'm using the standard size - it always used to be OK?

Link to post
Share on other sites
3 hours ago, glasgow4a said:

Best of luck with JDO Instruments.  I used Speedograph Richfield in Nottingham, good service, good price, speedo working perfectly, cheers Ian.

Thanks Ian, interestingly they were the only company out of 6 I emailed who even bothered to respond

David

Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
×
×
  • Create New...

Important Information

Please familiarise yourself with our Terms and Conditions. By using this site, you agree to the following: Terms of Use.