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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: 62
Leicestershire, England
O
Owain Offline OP
BritBike Forum member
Owain  Offline OP
BritBike Forum member
O
Joined: Aug 2015
Posts: 62
Leicestershire, England
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
1969 - BSA Rocket 3
1950- BSA A10
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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: 1,677
Canada
L
LarryLebel Offline
BritBike Forum member
LarryLebel  Offline
BritBike Forum member
L
Joined: Oct 2008
Posts: 1,677
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: 3,463
Orygone
Boomer Offline

BritBike Forum member
Boomer  Offline

BritBike Forum member
Joined: Feb 2011
Posts: 3,463
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: 62
Leicestershire, England
O
Owain Offline OP
BritBike Forum member
Owain  Offline OP
BritBike Forum member
O
Joined: Aug 2015
Posts: 62
Leicestershire, England
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
1969 - BSA Rocket 3
1950- BSA A10
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: 888
newcastle australia
trevinoz Offline
BritBike Forum member
trevinoz  Offline
BritBike Forum member
Joined: Jul 2006
Posts: 888
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.

Moderated by  Allan Gill, Jon W. Whitley 


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