Speedo drive mashed
-
- Posts: 135
- Joined: Mon Jan 14, 2019 5:37 pm
- Location: Aberdeenshire
Speedo drive mashed
Some Qs if I may
Any idea what happened here?
Is it a known fault?
I assume spares are readily available?
Also, as part of the shake down post rebuild - rebuild by PO I hasten to add, it is leaking far too much oil at the top of the valve drive cover, also from underneath somewhere and maybe even the pressed steel primary chain cover - cannot be absoulutely sure. Oh well...It'll keep me busy I supoose....
You do not have the required permissions to view the files attached to this post.
- dave16mct
- Member
- Posts: 3258
- Joined: Mon Jan 01, 1990 12:00 am
- Location: LANCASHIRE UK
Re: Speedo drive mashed
The usual cause is incorrect assembly of the oilseal retainer in the hub. Have a look at posts on speedo drive lock-up. There's a cut-away view of the assembly in the Tech articles.
Dave.
Dave.
-
- Posts: 2884
- Joined: Mon Mar 24, 2014 5:44 pm
- Location: Aberdeenshire
Re: Speedo drive mashed
Hi Oggers
Your speedo drive failure smacks of incorrect assembly, (order or torque), you will need to strip it down carefully and document how it was assembled to allow us to comment with certainty. The speedo drive assembly is a known area where others have experienced failures.
Have you had the back wheel off since you have owned the bike?
It's fixable and the speedo should be OK
Regards Mick
Your speedo drive failure smacks of incorrect assembly, (order or torque), you will need to strip it down carefully and document how it was assembled to allow us to comment with certainty. The speedo drive assembly is a known area where others have experienced failures.
Have you had the back wheel off since you have owned the bike?
It's fixable and the speedo should be OK
Regards Mick
-
- Posts: 135
- Joined: Mon Jan 14, 2019 5:37 pm
- Location: Aberdeenshire
Re: Speedo drive mashed
Gents
Many thanks for the replies. Not touched the rear wheel at all since purchase. I will strip it down and revert. Spares OK? Do I go to AMC spares or similar, or chance EBay? If the latter, what description am I looking for - as I guess drives may be compatible with other bikes?
Many thanks for the replies. Not touched the rear wheel at all since purchase. I will strip it down and revert. Spares OK? Do I go to AMC spares or similar, or chance EBay? If the latter, what description am I looking for - as I guess drives may be compatible with other bikes?
-
- Posts: 2884
- Joined: Mon Mar 24, 2014 5:44 pm
- Location: Aberdeenshire
Re: Speedo drive mashed
Hi Oggers
Strip it down first - the speedo drives can be serviced and a second hand item may suit your replacement parts needs - failing that I'd go for a recognised supplier. I think you'll find the part number / details of the drive on the grease seal cover plate fitted to the inner face of the GB.
Not a good photo but it should give you a pointer of where the detail may be:
Regards Mick
Strip it down first - the speedo drives can be serviced and a second hand item may suit your replacement parts needs - failing that I'd go for a recognised supplier. I think you'll find the part number / details of the drive on the grease seal cover plate fitted to the inner face of the GB.
Not a good photo but it should give you a pointer of where the detail may be:
Regards Mick
You do not have the required permissions to view the files attached to this post.
- clive
- Member
- Posts: 5676
- Joined: Mon Jan 01, 1990 12:00 am
- Location: LONDON UK
Re: Speedo drive mashed
The drive unit in Oggers photo is the earlier type with the flat end. This may not have the part number and ratio in the place in micks photo. However all our postwar bikes have a 2:1 clockwise drive.
Incidentally whilst i think many of these failures are as described, incorrect assembly, i also believe a worn out drive worm gear can lock against the drive ring. The disintegration of your unit is pretty catastrophic and there appears to be damage along the top of the drive unit. Usually when its the wrong assembly the unit locks up the rear wheel bearing rather that disintegrating.
Incidentally whilst i think many of these failures are as described, incorrect assembly, i also believe a worn out drive worm gear can lock against the drive ring. The disintegration of your unit is pretty catastrophic and there appears to be damage along the top of the drive unit. Usually when its the wrong assembly the unit locks up the rear wheel bearing rather that disintegrating.
clive
if it ain't broke don't fix
if it ain't broke don't fix
- ajscomboman
- Member
- Posts: 3971
- Joined: Mon Jan 01, 1990 12:00 am
- Location: HAMPSHIRE UK
Re: Speedo drive mashed
May I be so bold as to suggest that, as you've had so much help and advise that you join the club and buy the spares from our parts service.Oggers wrote:Gents
Many thanks for the replies. Not touched the rear wheel at all since purchase. I will strip it down and revert. Spares OK? Do I go to AMC spares or similar, or chance EBay? If the latter, what description am I looking for - as I guess drives may be compatible with other bikes?
-
- Posts: 135
- Joined: Mon Jan 14, 2019 5:37 pm
- Location: Aberdeenshire
Re: Speedo drive mashed
You may indeed Sir. Duly paid 28 GBP by Paypal.........May I be so bold as to suggest that, as you've had so much help and advise that you join the club and buy the spares from our parts service.
- ajscomboman
- Member
- Posts: 3971
- Joined: Mon Jan 01, 1990 12:00 am
- Location: HAMPSHIRE UK
Re: Speedo drive mashed
Thank you, you're a gentleman.Oggers wrote:You may indeed Sir. Duly paid 28 GBP by Paypal.........May I be so bold as to suggest that, as you've had so much help and advise that you join the club and buy the spares from our parts service.
- clive
- Member
- Posts: 5676
- Joined: Mon Jan 01, 1990 12:00 am
- Location: LONDON UK
Re: Speedo drive mashed
Welcome to the club.Oggers wrote:You may indeed Sir. Duly paid 28 GBP by Paypal.........May I be so bold as to suggest that, as you've had so much help and advise that you join the club and buy the spares from our parts service.
clive
if it ain't broke don't fix
if it ain't broke don't fix