The BSA A7-A10 Forum

Technical => Clutch, Primary, Gearbox => Topic started by: iansoady on 11.01. 2011 16:07

Title: Clutching at straws
Post by: iansoady on 11.01. 2011 16:07
I'm a little confused by what clutch I have on my 1961 Flash (with a slightly earlier engine). It's a 4 spring job but when I got a new tab washer from C&D it didn't look anything like the one that came out: the new shiny one is much bigger and I can't see anything for it to locate on. I attach pics of the old & new tab washers, clutch centre (on the mainshaft) and securing nut.

Could this be a cush clutch? And if so is it likely to be a problem? I found this thread (http://www.a7a10.net/forum/index.php/topic,1133.0.html) which seems to suggest not but I can't see the hole in the clutch centre referred to there. And I'm not sure what sort of tab washer (if any) I should be looking for. Triumph?

(http://i43.photobucket.com/albums/e398/iansoady/bsa/th_tabwashers.jpg) (http://s43.photobucket.com/albums/e398/iansoady/bsa/?action=view&current=tabwashers.jpg)

(http://i43.photobucket.com/albums/e398/iansoady/bsa/th_clutchcentre.jpg) (http://s43.photobucket.com/albums/e398/iansoady/bsa/?action=view&current=clutchcentre.jpg)

(http://i43.photobucket.com/albums/e398/iansoady/bsa/th_nutspacer.jpg) (http://s43.photobucket.com/albums/e398/iansoady/bsa/?action=view&current=nutspacer.jpg)
Title: Re: Clutching at straws
Post by: muskrat on 11.01. 2011 18:51
G'day Ian,
              it looks like a cush type. I had one on the SS and as Trev said on the link post, I only used RED loctite for the nut.
Cheers
Title: Re: Clutching at straws
Post by: trevinoz on 11.01. 2011 19:50
Ian,
          As Musky said, you have a cush type from a Triumph.
The BSA hub doesn't have a cush and has a flat for the tab washer to be bent over.
Trev.
Title: Re: Clutching at straws
Post by: A10Boy on 13.01. 2011 16:13
SRM say dont bother with a tab washer it doesn't need one. They say, just assemble with loctite and tighten to 64Ft/LBS and it will be fine.
Title: Re: Clutching at straws
Post by: chaterlea25 on 13.01. 2011 19:38
HI, iansoady
As others have said throw away the lockwasher with the cushdrive type clutch centre!!
Theres a special thick washer (3/16in??) fits over the centre nut, An ordinary washer is NO Good
Make sure the centre is clamped tight by the washer onto the centre adaptor !!
If the centre is loose on the adaptor it will soon wear on the splines *sad2*

HTH
John O R
Title: Re: Clutching at straws
Post by: iansoady on 14.01. 2011 13:44
Yes, I have the special washer which I've fitted with the recess inward )_ I assume so that the outer edge holds the clutch centre against the adaptor.

I've also found a spring washer in my scrap box that fits perfectly under the head of the sleeve nut so have fitted that as well, as well as loctite and the requisite white knuckles on the T bar....

Now I'm trying to work out how on earth you get a straight split pin through the hole in the engine mainshaft when it's shrouded by the engine shock absorber nut.
Title: Re: Clutching at straws
Post by: chaterlea25 on 14.01. 2011 21:15
Hi Ian,
More Loctite  *ex*
You can curve the pin and feed it through with a pliers *idea*

HTH
John O R
Title: Re: Clutching at straws
Post by: iansoady on 15.01. 2011 12:15
Yes, that's what I ended up doing. It does seem a bit weird though, especially as the nut would have to unscrew a fair way before it even met the split pin.
Title: Re: Clutching at straws
Post by: brackenfel on 15.01. 2011 14:22
Hi Ian,
Agree with others about the split pin. I bent mine slightly and used a pein hammer (small head job) and gently tapped it through.. It's a right fiddle but you get there in the end. It does seem a "belt 'n braces" job as my nut was a way from the pin also..

Hope this helps,
Adrian
Title: Re: Clutching at straws
Post by: iansoady on 15.01. 2011 16:14
Many thanks all.

It's funny that on the A10 what should be the simple jobs are a bit of a pain (eg holding the footrests in position whilst getting the nut on the rod, getting the back wheel out, this split pin) whilst others which on previous bikes drove me to distraction (eg the Velo's clutch) are nice & simple.

Still, onwards and upwards...