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#611718 - 08/06/15 8:04 am Removing Magdyno from B33...Trouble  
Joined: Aug 2015
Posts: 61
Owain Offline
BritBike Forum member
Owain  Offline
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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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#611735 - 08/06/15 10:20 am Re: Removing Magdyno from B33...Trouble [Re: Owain]  
Joined: Oct 2008
Posts: 1,654
LarryLebel Offline
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LarryLebel  Offline
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Joined: Oct 2008
Posts: 1,654
Canada
Maybe use a block of hard wood instead.

#611740 - 08/06/15 11:14 am Re: Removing Magdyno from B33...Trouble [Re: Owain]  
Joined: Feb 2011
Posts: 3,354
Boomer Online content
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Boomer  Online Content

BritBike Forum member

Joined: Feb 2011
Posts: 3,354
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
#611779 - 08/06/15 3:31 pm Re: Removing Magdyno from B33...Trouble [Re: Owain]  
Joined: Aug 2015
Posts: 61
Owain Offline
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Owain  Offline
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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
#611791 - 08/06/15 5:39 pm Re: Removing Magdyno from B33...Trouble [Re: Owain]  
Joined: Jul 2006
Posts: 871
trevinoz Online content
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trevinoz  Online Content
BritBike Forum member

Joined: Jul 2006
Posts: 871
newcastle australia
Put a piece of rag between the gears.

#611850 - 08/07/15 5:29 am Re: Removing Magdyno from B33...Trouble [Re: Owain]  
Joined: Sep 2013
Posts: 745
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.

Moderated by  Allan Gill, Jon W. Whitley 


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