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Repairs to a Smiths speedometer gearbox.
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Mags 1
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August 3, 2018 - 8:08 pm
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I have other spares, but this one was sitting unused on the dummy rear wheel I'd installed on the D14 Sporter, just so that I could wheel the bike in and out of shed when needs be.

It was seized up, unmoving, I would be gaining nothing to let it sit longer unused, so some used petrol was looked out and a few basic tools assembled in readiness.

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Takes very little time or effort to remove the felt seal, holder and large washer, this is generally where most folk stop, dunking it as it now is into paraffin or petrol isn't much use, as it can't get rid of all the thick hard grease, nor free off the very tight gears, in most cases.

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These must be removed, to do the job properly, although in my case it was the pinion type gear that was jammed, not this big one.

The big one has 19 teeth, the smaller ten, therefore the 19-10 gearing.

Four now on the road and at least several in bits.

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Mags 1
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August 3, 2018 - 8:18 pm
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Only one of the remaining three aluminium rivets was actually still holding the dished steel anchor plate for the main gear placement, levering this last one off had both parts off and awaiting cleaning and inspection.

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Ready for dunking now.

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Even very dirty petrol still has wonderful cleaning properties, I advise the wearing of decent rubber gloves though, if putting hands into it, the least you can get is very dry chapped skin and possibly worse.

Now that the dirt is out of the way, the ends of the two phosphor bronze or brass end bushes can be seen, I always knock out the cable end one first.

If I remember correctly, I once knocked out the butt or dead end but was unable to get the gear out that way, but if you get a screwdriver or ally, brass etc soft punch and knock out the cable end first, gear will pull straight out, then butt end can be removed with an ordinary punch.

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Gearshaft was tight onto bush, tapping with a screwdriver inserted between like a wedge soon had things moving.

Four now on the road and at least several in bits.

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Mags 1
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August 3, 2018 - 8:41 pm
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A few minutes later I had four items instead of one in my hands, try not to lose those little brass/bronze washers, I have no idea whee you'd find replacements now.

The rust and dirt on the shaft is plain to see, a session on the aggressive wire wheel soon sorted that.

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The only damage I caused was to one bush that was nowhere near inner or outer working surfaces, easily taken care of with a file.

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Four more bits for the aggressive wheel treatment.

Four now on the road and at least several in bits.

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Mags 1
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August 3, 2018 - 8:43 pm
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Site is saying my maximum number of ten links has been exceeded, I'll have another go tomorrow, if anyone wishes me to carry on with this.

Four now on the road and at least several in bits.

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stubaker58
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August 3, 2018 - 9:37 pm
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Yes please Mags, just getting to the really interesting bit ... how to put it all back together!

thanks

D7/14 hybrid (4 speed with D7 crank etc.) on the road, D10 Bushman awaiting rebuilding.

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Blue Heeler
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August 3, 2018 - 10:31 pm
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Good work,should be very useful for folk.

Did you make up a slide-hammer attachment to remove the worm top bush?

Blue

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Mags 1
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August 4, 2018 - 11:38 am
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Blue Heeler said
Good work,should be very useful for folk.

Did you make up a slide-hammer attachment to remove the worm top bush?

Blue  

Not sure what you mean by a slide hammer in this case Blue, just punches, hammer and screwdrivers were used, but I have used a slide hammer before and know what you mean.

Four now on the road and at least several in bits.

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Mags 1
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August 4, 2018 - 12:30 pm
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Nobody seems to believe that I receive this message, have found out how to do screen shots now and here it is, there were seven links here also, not ten.

I'll try again tonight, hoping I can post another ten in 24 hours from first lot? 

Or maybe it's ten per week?[Permission to view this image is denied]

Four now on the road and at least several in bits.

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Blue Heeler
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August 4, 2018 - 12:58 pm
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Mags 1 said

Not sure what you mean by a slide hammer in this case Blue, just punches, hammer and screwdrivers were used, but I have used a slide hammer before and know what you mean.  

I have a big old log bolt,large washer,50cc crank flywheel,weld nut same thread as speedo g/box outlet thread,screw on and slide-hammer out after securing unit soft-jaw vice.

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cocorico
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August 4, 2018 - 1:38 pm
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Mags 1 said
Nobody seems to believe that I receive this message, have found out how to do screen shots now and here it is, there were seven links here also, not ten.

I'll try again tonight, hoping I can post another ten in 24 hours from first lot? 

Or maybe it's ten per week? 

I have had that message once (last week, posting pictures of Indians) - but that was more than 10 on one post, which I find acceptable. Don't know the mechanism triggering it, I imagine it's built in to the forum software. It don't see it being a personal intervention.

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Mags 1
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August 4, 2018 - 5:16 pm
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Blue Heeler said

I have a big old log bolt,large washer,50cc crank flywheel,weld nut same thread as speedo g/box outlet thread,screw on and slide-hammer out after securing unit soft-jaw vice.  

I get you now, but what thread is on the cable bush outer? Cycle maybe?

Four now on the road and at least several in bits.

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Mags 1
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August 4, 2018 - 5:19 pm
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cocorico said

Mags 1 said
Nobody seems to believe that I receive this message, have found out how to do screen shots now and here it is, there were seven links here also, not ten.
I'll try again tonight, hoping I can post another ten in 24 hours from first lot? 
Or maybe it's ten per week? 

I have had that message once (last week, posting pictures of Indians) - but that was more than 10 on one post, which I find acceptable. Don't know the mechanism triggering it, I imagine it's built in to the forum software. It don't see it being a personal intervention.  

Thanks for your comment cocorico, I'll try again and maybe use less links on each posting to see if it helps. But using more posts with less links seems to be the same thing somehow, I'm no computer whiz kid I'm afraid.

Four now on the road and at least several in bits.

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Mags 1
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August 5, 2018 - 10:54 pm
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Cleaned up, moving freely and lightly greased, ready to re-install.

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I use the Smith's logo to remind me where cable entry end goes, others may be different.

 

Getting bushes lined up accurately is important, tiny ally lug on body goes into a space on bush, item won't go together correctly if you don't observe this. DONT forget the two washers!

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The rivets holding the big gear and flanged washer in are tiny, somewhere around 1 - 2 mm thick, easily lost. I've just bought some from ebay that might be suitable, so I think it's still a viable project to strip these out, especially if new rivets can be found to fit.

 

Should have cleaned this better maybe, but it'll never be seen, except here of course, ratio can be seen here,

 

Getting the old rivets back in securely and up tight is hardest part, trying to hold 'box, hammer and punch on your own is a lesson in dexterity. But it can be done, outside surface is slight shallower or depressed near spindle area so I mounted  an old clutch re-assembly piece of round bar steel that fitted that area nicely, (about an inch and a quarter thick) so that 'box just sat there above vice. A suitable punch was found and remaining three rivets were burred back over with a sharp tap or two each.

Four now on the road and at least several in bits.

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Mags 1
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August 5, 2018 - 11:00 pm
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Masked up.

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A squirt or two of ally paint later.

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And fitted, the Sporter requires a spacer on the outside, according to my parts book.

I may try re-posting the three pics I had to delete on last post, three now seems to be the maximum I can use.

Four now on the road and at least several in bits.

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Pootle
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August 6, 2018 - 7:55 am
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I’ve just bought similar looking small aluminium rivets to fit the cover plate to the brake plate on a Matchless, probably common to most large AMC models. 

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Mags 1
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August 7, 2018 - 6:10 pm
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A common dotted pin here in comparison.

Buy in haste and repent at your leisure I suppose, these brass items came a few days ago, heads are certainly smaller than the originals, bodies are supposed to be 1mm thick, I feel that originals are a bit thicker though.

A minute or twos work with the metric micrometer could have saved me hassle here, but they weren't very expensive.

Four now on the road and at least several in bits.

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Mags 1
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August 10, 2018 - 6:50 pm
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Slide hammer.

Thanks to Blue, I was able to make a half inch X 26 TPI Cycle nut and weld it to a two foot length of metric studding, I used an old Wipac flywheel with a damaged keyway, a Nyloc nut but no washer on the other end completed the ensemble.

Three good slide hammering sessions and the corroded ally and brass union finally gave way.

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I may be able to use the ally body and bushes, washers, so not all in vain.

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Thanks Blue, a good idea.DD.

Four now on the road and at least several in bits.

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Blue Heeler
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August 18, 2018 - 4:45 pm
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Nice work Mags,I`ve only just seen your post.That should stand you in good stead for other jobs.I used factory kit back in my Ag Mech(removal of very tight Combine Harvester shafts after drill-relieving their thick brass bushing) & Heavy Plant days,so contd with the concept into my car and bike work,where I knocked up suitable copies.

Great for when the shock treatment you can`t get with a press,is required....and access issues dictate.

Blue

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Mags 1
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December 6, 2018 - 9:27 pm
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The two mill by six mill rivets came this morning and I decided to have another go to see if these were a better fit than the 1.6 I think they were last efforts.

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Used an old fshioned hand drill to mount the tiny just under two mill thick bit.

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Had to takle a few thous out of gearbox body and the steel gear retainer ring with drill bit, but new rivets sat there very nicely.

All I need now is some new gears to replace the scrap ones I have, I doubt that will happen, but I can now strip out these gearboxes with confidence and rebuild them ready to do their job again for a few more thousand miles in the future.

Four now on the road and at least several in bits.

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Mags 1
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December 6, 2018 - 9:31 pm
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Head of rivet is just right I think, interfering with nothing.

Rivets are from a chap in Poland making them, they are advertised as parts for metal models, but they fit well and are quite cheap, I think I paid about £10 for the fifty items, plus post and packing, they came in an envelope, so it couldn't have been very much.

If anyone's interested, I can put a link on here.

Four now on the road and at least several in bits.

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