BSA Owners' Club Workshop Discussions

The BSA Workshop => Singles => Topic started by: Mike Farmer on 05 Sep, 2018, 20:17

Title: M20 gearbox
Post by: Mike Farmer on 05 Sep, 2018, 20:17
 :)

My M20 gearbox is poorly and I am not a gearbox person.

Anyone able to recommend a gearbox man. Distance no object.

Mike 8) 8)
Title: Re: M20 gearbox
Post by: BeenyBoy on 06 Sep, 2018, 09:51
The M series box isn't really complicated...download the service sheer- 608 I think- take some photos at strategic points as you strip it down and it'll be fine .......probably !

 
Title: Re: M20 gearbox
Post by: Mike Farmer on 06 Sep, 2018, 11:43
 :)

Hi Thanks for that. I shall probably go that way. (I would also like a back up rescue service). However I have never been a gearbox person and I'm not sure what I would be looking for.

But I'll give it a go.

Mike 8) 8)
Title: Re: M20 gearbox
Post by: Pete C on 06 Sep, 2018, 15:52
Hi Mike

I have a file that contains a fair bit of info on these gearboxes but it is too large to post here.

If you drop me a mail at petercomley@web.de I'll send it to you

cheers
Pete
Title: Re: M20 gearbox
Post by: Dean Southall on 06 Sep, 2018, 19:57
The guys on the M20 forum are very knowledgeable and helpful. You may even find someone to do the job for you.

http://pub37.bravenet.com/forum/static/show.php?usernum=3155626639&frmid=0&msgid=0
Title: Re: M20 gearbox
Post by: Mike Farmer on 07 Sep, 2018, 14:14
 :)

Once again thank you all for your interest and advice. I now intend to try and sort it myself and will let you know how it goes.

Mike 8) 8)
Title: Re: M20 gearbox
Post by: Mike Farmer on 11 Sep, 2018, 10:00
The worst that can happen is that I shall end up with a slack handful of cogs and bits on the bench. Then I may need a gearbox man.

Mike 8) 8)
Title: Re: M20 gearbox
Post by: Dean Southall on 12 Sep, 2018, 16:37
Have you rebuilt that gearbox yet Mike ;)

Have you checked the technical section on the Wm20 website? There is information there on how to rebuld the box.
Title: Re: M20 gearbox
Post by: berniej on 13 Sep, 2018, 09:01
Hi Mike,

Just finished re-building the box on my M21 (and every other part!) If bearings and bushes are good then the only thing I found that needed attention was the pawl mechanism. I replaced the two springs and adjusted the operating rod in order to get a reliable shift.

On mine the bushes were OK but bearings shot - fairly easily replaced.

Give me a shout if you need any help - bernie.a.jones@gmail.com
Title: Re: M20 gearbox
Post by: Mike Farmer on 13 Sep, 2018, 10:27
 :)
Thanks That's very much appreciated.

Mike 8) 8)