The BSA A7-A10 Forum

Technical => Clutch, Primary, Gearbox => Topic started by: WozzA on 12.12. 2011 08:30

Title: OUCH
Post by: WozzA on 12.12. 2011 08:30
  *sad2*  Ohhhh DEAR...I was sorting out bits that belong in my gear box today...
I know that the MAINSHAFT bearing had previously been replaced with a new one, the shaft has blued & scored from the failure,
What can be done? or is it a BIN JOB?   *sad2*
(http://i245.photobucket.com/albums/gg63/WozzA_photo/th_DSCN2249Large.jpg) (http://s245.photobucket.com/albums/gg63/WozzA_photo/?action=view&current=DSCN2249Large.jpg)
Also I noticed the Gearbox cam plate plunger seems to be eaten away just below the tip...
What would cause this???  
(http://i245.photobucket.com/albums/gg63/WozzA_photo/th_DSCN2254Large.jpg) (http://s245.photobucket.com/albums/gg63/WozzA_photo/?action=view&current=DSCN2254Large.jpg)

Cheers.... Woz
Title: Re: OUCH
Post by: MG on 12.12. 2011 10:02
That would be the layshaft in your pic, looks like it ran without oil. This can however be fixed by removing a minimum of material off the shaft until it is nice and smooth again, either in the lathe using a good carbide tool, or even better in a circular grinding machine. Then machine, fit and ream an oversize bronze bush to match the shaft, been there, done that, works perfectly okay in the A7.

No idea what happened to the plunger though, unless it came out of it's housing and was mangled through the gearbox at some time???

All the best, Markus
Title: Re: OUCH
Post by: WozzA on 12.12. 2011 12:06
 *smiley4* thanks for your reply Markus,
I was hopeing I did'nt need to replace the layshaft,
thats the trouble when buying a bike that others have played with / pulled to pieces & parts placed in storage boxes years ago..  ????
Fingers crossed I dont come across any more supprises.. 

Cheers Woz
Title: Re: OUCH
Post by: kiwipom on 12.12. 2011 19:18
hi guys/woz, here is a Modification that may interest you,cheers,Bob
Title: Re: OUCH
Post by: bsa-bill on 12.12. 2011 20:14
I've had one of those in my Flash for maybe six or seven years now, bought it from some one in Oz who I believe made them, came with quite detailed instructions,good buy
Title: Re: OUCH
Post by: trevinoz on 12.12. 2011 20:56
Wozza,
               Maybe the new bush was too tight on the shaft.
Put the shaft in a lathe a give it a good polish with emery tape and have a good look at the bush.
Maybe a light ream will fix it if there's not enough clearance.

  Trev.
Title: Re: OUCH
Post by: WozzA on 12.12. 2011 22:26
Thanks for the input guys... I'll have to get someone who has more engineering knowledge than me to have a look at what can be done..
Bob... I like the look of that roller bearing ... that would make it a lot smoother shift.
BSA-bill..  If ya get over the memory loss  ????   *dunno* I'd be interested in who you got it from ? 

Cheers Woz
Title: Re: OUCH
Post by: MG on 12.12. 2011 22:35
Beeza Bill (RIP) had some DIY instructions published on his homepage, now hosted here:
http://bsa-a10.hailwood.com/bsaimprovements.html (http://bsa-a10.hailwood.com/bsaimprovements.html)
Title: Re: OUCH
Post by: WozzA on 13.12. 2011 05:10
 wink2  Thanks MG... I'll add that to my wish list..   *contract*

Cheers Woz
Title: Re: OUCH
Post by: lowbrowbsa on 04.01. 2012 14:14
rip bill he was a good mate he actuly built my engine it was the last bsa he put his skilled hands to
his world of experince will be missed RIDE IN PEACE bill
Title: Re: OUCH
Post by: orabanda on 04.01. 2012 15:00
here is an evocative clip of Bill on maybe his last crossing of the nullabor (leaving Norseman, heading to South Australia).
Doesn't the A65 sound great as he pegs it out!

http://www.youtube.com/watch?v=2W-YyJcSnhM

Richard
Title: Re: OUCH
Post by: WozzA on 04.01. 2012 22:13
I didnt join this forum in time to know of him...
BUT after seeing that video I sure do have respect for the man..
Title: Re: OUCH
Post by: WozzA on 07.01. 2012 06:30
Just a little follow up...
(http://i245.photobucket.com/albums/gg63/WozzA_photo/th_DSCN2294Large.jpg) (http://s245.photobucket.com/albums/gg63/WozzA_photo/?action=view&current=DSCN2294Large.jpg)
I purchased a new .006" undersize bush & had the layshaft machined to match.
question... HOW do I install the bush? do I cool the bush in the freezer & heat up the Inner cover in the BBQ then press fit or ??????

Cheers WozzA
Title: Re: OUCH
Post by: bsa-bill on 07.01. 2012 10:09
sounds like a plan to me, bit of work with a pencil and straight edge can help line up the hole in bush
Title: Re: OUCH
Post by: WozzA on 07.01. 2012 11:51
Thanks Bill.... I'll give that a try..   *lol*
Title: Re: OUCH
Post by: trevinoz on 07.01. 2012 19:29
Heat the cover in the oven when the wife is out!
She'll love you when she comes home!
I've got an old oven in the shed which I use. You can get an accurate and even temperature this way.
Trev.
Title: Re: OUCH
Post by: WozzA on 07.01. 2012 22:49
Heat the cover in the oven when the wife is out!
She'll love you when she comes home!
& she loves you so much you had to get one in the shed eh?   hahahaaa
(http://i245.photobucket.com/albums/gg63/WozzA_photo/chip-1.gif)
They DO get a bit funny when you use their kitchen table for parts dont they..