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Removing Magdyno from B33...Trouble #611718
08/06/15 8:04 am
08/06/15 8:04 am
Joined: Aug 2015
Posts: 61
Malmö, Sweden
O
Owain Offline OP
BritBike Forum member
Owain  Offline OP
BritBike Forum member
O
Joined: Aug 2015
Posts: 61
Malmö, Sweden
Hi,

So I'm dismantling the engine of the B33 barn find I have. I'm having trouble removing the magneto drive pninion center nut. Everytime I take a spanner to loosen it...the entire cam gears rotate with it. One of the fella's in the garage said to stick a spanner in the teeth of one of the cam gears to stop it rotating when I try to loosen the nut but that sounds a sure-fire way to knacker the gears themselves.

In the Haynes manual, it says just use a spanner to loosen it....and then use a special tool (no.61-1903) to extract the pninion itself. No chance of me getting to that pninion with this gear and nut in the way though...

Any solutions?


Owain
1972 - Triumph TR7P
1953 - BSA B33
1969 - BSA A75R Rocket 3
1950- BSA A10

www.theangrywelshman.com
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Re: Removing Magdyno from B33...Trouble [Re: Owain] #611735
08/06/15 10:20 am
08/06/15 10:20 am
Joined: Oct 2008
Posts: 1,663
Canada
L
LarryLebel Online content
BritBike Forum member
LarryLebel  Online Content
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L
Joined: Oct 2008
Posts: 1,663
Canada
Maybe use a block of hard wood instead.

Re: Removing Magdyno from B33...Trouble [Re: Owain] #611740
08/06/15 11:14 am
08/06/15 11:14 am
Joined: Feb 2011
Posts: 3,411
Orygone
Boomer Online content

BritBike Forum member
Boomer  Online Content

BritBike Forum member
Joined: Feb 2011
Posts: 3,411
Orygone
Put the bike in gear, sit on the seat with one foot on the rear brake, remove the nut. The pinion gear sits on a taper. You need an extractor, 61-1903, that threads into the center of the gear. Snug up the bolt in the center of the extractor but don't over tighten. The bolt doesn't remove the gear, a light tap on the end of the bolt will break the hold on the taper. If you use the bolt to remove the gear you will mushroom the end of the magneto pinion.


Bill B...


Boomer
Re: Removing Magdyno from B33...Trouble [Re: Owain] #611779
08/06/15 3:31 pm
08/06/15 3:31 pm
Joined: Aug 2015
Posts: 61
Malmö, Sweden
O
Owain Offline OP
BritBike Forum member
Owain  Offline OP
BritBike Forum member
O
Joined: Aug 2015
Posts: 61
Malmö, Sweden
Cheers boomer, unfortunately the engine is already removed and laying on a work bench...so no chance of me placing the bike in gear and removing it that way. Good tips for pninion Removal though. Perhaps sticking an old wooden Broom handle between the CAM gears like Larry suggested might work without arsing up the teeth on the gears..


Owain
1972 - Triumph TR7P
1953 - BSA B33
1969 - BSA A75R Rocket 3
1950- BSA A10

www.theangrywelshman.com
Re: Removing Magdyno from B33...Trouble [Re: Owain] #611791
08/06/15 5:39 pm
08/06/15 5:39 pm
Joined: Jul 2006
Posts: 878
newcastle australia
trevinoz Online content
BritBike Forum member
trevinoz  Online Content
BritBike Forum member
Joined: Jul 2006
Posts: 878
newcastle australia
Put a piece of rag between the gears.

Re: Removing Magdyno from B33...Trouble [Re: Owain] #611850
08/07/15 5:29 am
08/07/15 5:29 am
Joined: Sep 2013
Posts: 745
Westminster, Colorado
stubbicatt R.I.P. Offline
In Remembrance
stubbicatt R.I.P.  Offline
In Remembrance
Joined: Sep 2013
Posts: 745
Westminster, Colorado
A shop towel or rag in the gears will jamb them so that the nut may be loosened.


Hate is a poison which one consumes hoping for another to die.

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