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M21 Rear wheel axle nuts/spacer pic requested #631232
12/22/15 4:37 pm
12/22/15 4:37 pm
Joined: Oct 2015
Posts: 101
Cleveland, Ohio
J
Jack D Offline OP
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Jack D  Offline OP
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Cleveland, Ohio
Because it's 60 degrees F in Cleveland and sunny, I figured a good way to spend the afternoon was fitting what parts I had.

Question: On the axle picture below, what am I missing on the right hand side of the rear axle?

I see some various nuts, etc on the parts book (see pic - I think I'm missing one washer #6, and main nut #7 but want to confirm) but it's not clear what goes on which side of the frame - can somebody perhaps post a close-up of their rear axle right side?

Current build, embarrassed to show it, but here she is:



Rear wheel axle right side close-up - missing parts:



Parts book:


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Re: M21 Rear wheel axle nuts/spacer pic requested [Re: Jack D] #631256
12/22/15 7:51 pm
12/22/15 7:51 pm
Joined: Dec 2002
Posts: 3,241
arkansas
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leon bee Offline
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arkansas
No help from me, but how did they adjust drive chain on them?

Re: M21 Rear wheel axle nuts/spacer pic requested [Re: Jack D] #631287
12/22/15 10:56 pm
12/22/15 10:56 pm
Joined: Oct 2015
Posts: 101
Cleveland, Ohio
J
Jack D Offline OP
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Jack D  Offline OP
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Joined: Oct 2015
Posts: 101
Cleveland, Ohio
Well, the Haynes manual talks about an adjuster, but I don't have any parts for one, or at least I don't think I do. Not like my CB750 at all...I'm looking through the parts book and can't spot it either. Does anybody have any insight on the rear axle of a rigid M21? Thank you!




Last edited by Jack D; 12/22/15 11:01 pm.
Re: M21 Rear wheel axle nuts/spacer pic requested [Re: Jack D] #631294
12/23/15 12:40 am
12/23/15 12:40 am
Joined: Feb 2011
Posts: 3,409
Orygone
Boomer Online content

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Orygone
Jack, I think what Leon is getting at is your pictures of your bike and the parts book do not show the adjusters. So do you have a description of them in the parts book?


Bill B...


Boomer
Re: M21 Rear wheel axle nuts/spacer pic requested [Re: Jack D] #631295
12/23/15 12:46 am
12/23/15 12:46 am
Joined: Feb 2011
Posts: 3,409
Orygone
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Orygone
Sorry, I just reread your post and realized I didn't read your text.

It looks like from your picture of your frame rear axle drop out it might use something like what the Triumphs used. Which begs me to ask, are you sure this is a '57? Didn't know they still had rigid frames in '57. The tank looks like something off of a WD M20 with the cutoff corner.


Bill B...


Boomer
Re: M21 Rear wheel axle nuts/spacer pic requested [Re: Jack D] #631297
12/23/15 12:50 am
12/23/15 12:50 am
Joined: Dec 2002
Posts: 3,241
arkansas
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leon bee Offline
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arkansas
Well, I thought maybe that parts page was going to show snail cams like on my rigid B33. I went over and had a quick look at a Draganfly page, that makes it look like the M models had one snail cam on the drive side? If I've ever seen an M21 it would have been a long time ago. Lots of guys on this board will know, they just haven't checked in yet.

Re: M21 Rear wheel axle nuts/spacer pic requested [Re: Jack D] #631311
12/23/15 4:11 am
12/23/15 4:11 am
Joined: Jul 2013
Posts: 470
Death row next in line norfolk
Tribsauk Offline
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Death row next in line norfolk
There should be a snail adjuster between brake plate and frame casting this is then adjusted via turning a square on the end of wheel axle, the other side of wheel axle is adjusted via a long bolt that is threaded thru the front of the frame casting which then pushes the axle for adjustment.Looks like your frame has been modified where this long bolt threads thru as it has a welded on bracket!.. Also you need the correct rear axle nut this is a shouldered nut (no7 in the Haynes book) the nut you have fitted ont the outer should be on the inside hence the gap in your photo..Dave


1941 BSA WM20
1958 TRI-BSA 750 PRE UNIT
1957 THUNDERBIRD
1932 R E MODEL GS SPECIAL
1947 BSA YM21
Re: M21 Rear wheel axle nuts/spacer pic requested [Re: Boomer] #631330
12/23/15 10:03 am
12/23/15 10:03 am
Joined: Oct 2015
Posts: 101
Cleveland, Ohio
J
Jack D Offline OP
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Jack D  Offline OP
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Joined: Oct 2015
Posts: 101
Cleveland, Ohio
Originally Posted By Boomer
Sorry, I just reread your post and realized I didn't read your text.

It looks like from your picture of your frame rear axle drop out it might use something like what the Triumphs used. Which begs me to ask, are you sure this is a '57? Didn't know they still had rigid frames in '57. The tank looks like something off of a WD M20 with the cutoff corner.


Bill B...


Hi Bill (and leon bee, and Tribsauk), Thank you for answering, the numbers of the frame and engine match to a '57 (still rigid yes) but it was modified. I recently bought the tank from the UK and it's definitely earlier, but I couldn't pass up that tank! I do have the snail cam on the drivers side (those parts are complete - see phote) and based on your advice bought a new shouldered nut and will move that other nut. The welded on brackets are interesting to say the least, I haven't gone at the frame with a cutting torch or cutter yet, but probably will have to. I don't see the long bolt in the parts book but this thing is part voodoo so I'm probably just missing it.

So the story was told to me that the bike was a hill-climber in a previous life, it had HUGE knobby tires on the back and it was literally caked in dirt. The gent I got it from, my dear friend, said he bought it off a guy that saved it at a hill-climbing meet on the west cost of the US - he saw it running the early 70's and knew it didn't belong so he bought it. Over the years, parts leaked away and I got the frame, engine, and few bits out of a shipping crate that hadn't been opened in about 20 years.


Re: M21 Rear wheel axle nuts/spacer pic requested [Re: Jack D] #631335
12/23/15 10:20 am
12/23/15 10:20 am
Joined: Jul 2013
Posts: 470
Death row next in line norfolk
Tribsauk Offline
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Death row next in line norfolk
If you look to the rear of toolbox between the wheel spindle you can see this bolt

http://www.wdbsa.nl/civilian/1953a.jpg

Dave


1941 BSA WM20
1958 TRI-BSA 750 PRE UNIT
1957 THUNDERBIRD
1932 R E MODEL GS SPECIAL
1947 BSA YM21
Re: M21 Rear wheel axle nuts/spacer pic requested [Re: Jack D] #631379
12/23/15 4:29 pm
12/23/15 4:29 pm
Joined: Nov 2011
Posts: 125
Northern Ireland
B
B31 Ally Offline
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Posts: 125
Northern Ireland
Jack D,
if you look down the list of topics under the bsa forum in which you have posted this topic you will find one called 'Wheel for rigid B33 wanted', I have posted pictures of my 1949 rigid frame B31 rear axle set up in that topic which I converted to different bearings, it is possibly the same as your M21, I cant say for sure as I have no dealings ever with an M21. If you want exact measurements of nuts and spacers let me know and I will do my best to help you out.

Re: M21 Rear wheel axle nuts/spacer pic requested [Re: B31 Ally] #631397
12/23/15 6:37 pm
12/23/15 6:37 pm
Joined: Feb 2003
Posts: 2,884
Ohio
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Rickman Offline
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Ohio
If I'm seeing the frame as I think I am, the adjustment bolt goes THROUGH the axle fork casting from the front of the casting, PUSHING the axle rearward.

Same set-up as my '48 AJS.... Long bolt with a locking jamb nut...?

Question: Do the BSA axle fork castings have marks to help locate the axle, or none, as my AJS has?

Re: M21 Rear wheel axle nuts/spacer pic requested [Re: Jack D] #631404
12/23/15 7:34 pm
12/23/15 7:34 pm
Joined: Dec 2014
Posts: 99
Perth, Western Australia
H
Howley Online content
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Perth, Western Australia
Rickman is correct. You'll find the bolt and nut on the 'frame and fittings' diagram, (plate 7) in the '49-'58 parts book. Items 64 and 65, part numbers 27-4401 and 66-4620.

Re: M21 Rear wheel axle nuts/spacer pic requested [Re: Jack D] #631406
12/23/15 7:43 pm
12/23/15 7:43 pm
Joined: Dec 2014
Posts: 99
Perth, Western Australia
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Howley Online content
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Perth, Western Australia

Re: M21 Rear wheel axle nuts/spacer pic requested [Re: Jack D] #631407
12/23/15 7:43 pm
12/23/15 7:43 pm
Joined: Dec 2014
Posts: 99
Perth, Western Australia
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Howley Online content
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Howley  Online Content
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Perth, Western Australia

Re: M21 Rear wheel axle nuts/spacer pic requested [Re: Jack D] #631416
12/23/15 8:31 pm
12/23/15 8:31 pm
Joined: Dec 2002
Posts: 3,241
arkansas
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leon bee Offline
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arkansas
Man, I love this britbike forum.

Re: M21 Rear wheel axle nuts/spacer pic requested [Re: leon bee] #631419
12/23/15 9:21 pm
12/23/15 9:21 pm
Joined: Oct 2015
Posts: 101
Cleveland, Ohio
J
Jack D Offline OP
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Jack D  Offline OP
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Posts: 101
Cleveland, Ohio
Thank you all! After pulling the wheel off and scraping mud off (again) I found the hole!!! Now it makes sense, and thank you for the reference to the plate reference - see it and will order. Again, many thanks all, I really appreciate it and ever onward to getting another BSA back on the road!

To answer the question about the markings, I don't see any on my M21, at least none that lasted this long.




Last edited by Jack D; 12/23/15 9:28 pm.
Re: M21 Rear wheel axle nuts/spacer pic requested [Re: Jack D] #633661
01/04/16 9:04 pm
01/04/16 9:04 pm
Joined: Feb 2003
Posts: 2,884
Ohio
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Rickman Offline
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Ohio
I sure do hope your threads down that mud-packed hole are reuseable!

NOT rusted to uselessness...

Re: M21 Rear wheel axle nuts/spacer pic requested [Re: Rickman] #634103
01/07/16 10:33 pm
01/07/16 10:33 pm
Joined: Oct 2015
Posts: 101
Cleveland, Ohio
J
Jack D Offline OP
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Jack D  Offline OP
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Posts: 101
Cleveland, Ohio
Rickman - Got it threaded! Gray goop is anti-seize.



And fitted a headlight, which screams "patina me, patina me" Your wish is my command!


Re: M21 Rear wheel axle nuts/spacer pic requested [Re: Jack D] #634130
01/08/16 7:56 am
01/08/16 7:56 am
Joined: May 2004
Posts: 3,636
Sydney Australia
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BSA_WM20 Online content
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Sydney Australia
A bit late now, bit I ended up with an allan headed cap screw in there which is a lot easier to get a tool onto than the bolt, particularly when you are near the end of chain life and the wheel is a long way back.


Bike Beesa
Trevor

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