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#306682 - 04/05/10 7:24 pm 1973 750 TR7/T140 replace speedo drive?  
Joined: Feb 2009
Posts: 188
Triumph5ta Offline
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Triumph5ta  Offline
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Joined: Feb 2009
Posts: 188
London, England
Hi, my speedo drive gearbox is so worn out that I cant get the speedo drive to stay in place without the wheel being stiff to rotate. If I loosen off the wheel spindle nut then the speedo drive spins around. I am sure the driving collar is correctly located in the speedo drive. But the tangs in the drive are really worn and chewed up, in fact the whole thing is shagged out...
I have the correct components in the correct order including the spacer that I asked about in an earlier post. That is:
Bobbin shaped Spacer (37 below)
Speedo drive (38)
Outer distance Piece (39)

I was thinking about fitting an electronic cycle speedo anyway.
If I junk the speedo drive is there any reason why I cant replace all three above components with one long bobbin shaped spacer of the correct length?
As always thanks for your expert help.


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#306691 - 04/05/10 8:48 pm Re: 1973 750 TR7/T140 replace speedo drive? [Re: Triumph5ta]  
Joined: Jul 2009
Posts: 3,549
Pete R - R.I.P. Offline
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Pete R - R.I.P.  Offline
In Remembrance

Joined: Jul 2009
Posts: 3,549
Vic. Australia
Provided the wheel bearing has intact rubber seals, can't see a problem.I am surprised that it jams up.Does the drive turn freely when it is removed?Are there any scrape marks to show where it is binding?

#306704 - 04/05/10 10:13 pm Re: 1973 750 TR7/T140 replace speedo drive? [Re: Pete R - R.I.P.]  
Joined: Feb 2009
Posts: 188
Triumph5ta Offline
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Triumph5ta  Offline
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Joined: Feb 2009
Posts: 188
London, England
Yes its got new sealed bearings.
The drive snags and jumps if you turn it by hand. Its junk.

#306720 - 04/05/10 11:45 pm Re: 1973 750 TR7/T140 replace speedo drive? [Re: Triumph5ta]  
Joined: Oct 2003
Posts: 11,108
RF Whatley Online content
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RF Whatley  Online Content
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Joined: Oct 2003
Posts: 11,108
North Georgia, USA
Originally Posted By: Adam Fuller
The drive snags and jumps if you turn it by hand. Its junk.


All of which could have been avoided if you had only greased the drive unit every year when you greased your swing arm. You do grease your swing arm every year, right? eek


Older wheels used for competition without a speedo, such as the T120 TT, had a closure available to seal that bearing off. But there is nothing like that available for the conical hubs. If you go electronic, you might consider pulling the caps off the current drive unit and building a dust cover by filling the current body with "filler epoxy" such as "JB Weld". That will provide some protection and keep the aesthetics high.

bigt


Don't hide 'em, Ride 'em !!

RF Whatley
Cornelia, GA

"Shop Boy" at Rodi British Bikes
#306771 - 04/06/10 9:41 am Re: 1973 750 TR7/T140 replace speedo drive? [Re: RF Whatley]  
Joined: Feb 2009
Posts: 188
Triumph5ta Offline
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Triumph5ta  Offline
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Posts: 188
London, England
Well i bought the bike as a rusty pile of bits so have had no input on its past maintenance... judging by the state of the rest of it I find that maintenance of the speedo drive is very unlikely! Oddly the swing arm bearings are fine though, I have pulled them apart and cleaned and greased them AND fitted new grease nipples so you can sleep easy Mr RF knowing that there is at least one old Triumph no longer dying of neglect!

PING!: dim lightbulb flickers on...
I suppose I could just fit the housing back without the driving "collar" (42) so its simply acting as a spacer and dust seal?


#306774 - 04/06/10 10:34 am Re: 1973 750 TR7/T140 replace speedo drive? [Re: Triumph5ta]  
Joined: Oct 2004
Posts: 4,429
Tiger Offline
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Tiger  Offline
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Posts: 4,429
Melbourne Australia
Only speaking from my own experience but the Triumph rear wheel is a Pommy Headf#c#.

After you have got past the obtuse language of the OEM manual you may discover that the collapsible grease shields which are possibly absent from your wheel also function as shims.

"Grease shields" are incorporated on your new sealed bearings.

I shim with good hard fibre washers, they are easily modified ID/OD with a dremel type tool.


1969 TR6R
7.62 x 51 is not a maths puzzle.

Moderated by  John Healy 


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