Author Topic: Swinging arm nut torque setting ?  (Read 828 times)

Offline Stephen Foster

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Swinging arm nut torque setting ?
« on: 02.04. 2012 19:28 »
Is there a reccomended torque setting for the large nut (hollow spindle) swinging arm that Anyone is aware of please ?
Cant decide how to go about this ?

Steve ...
I own a 1955/56 B.S.A Swinging Arm "Golden Flash" , had it since 1976 .

Offline muskrat

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Re: Swinging arm nut torque setting ?
« Reply #1 on: 02.04. 2012 21:03 »
 G'day Steve,
                  I've had a look for torque settings to no avail. From memory (getting worse) I tighten till swing arm is clamped then back off 1/4 turn so it's free. Use red loctite or you could make a tab washer.
Cheers
'51 A7 plunger, '57 A7SS now A10CR,  '83 CB1100F, 88 FXST .
Australia
Muskys Plunger A7

Offline bsa-bill

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Re: Swinging arm nut torque setting ?
« Reply #2 on: 02.04. 2012 21:15 »
Sit on the bike (easier - get someone around your weight to sit on the bike) so that the S/A is about where it will be when ridden.
Now tighten the nut until it clamps the S/A good and tight, do NOT back it off, the S/A rotates as much as it needs to by the rubber in the silent block bushes flexing, this is on the face of it pretty unbelievable but it is how it works, the inner tube of the bush is clamped firmly between the frame sides and the rubber takes the strain.
If it's not tight all you will accomplish is to wear the end of the inner bush tubes or (worse) the frame
All the best - Bill
1961 Flash - stock, reliable, steady, fantastic for shopping
1959 Rocket Gold Flash - blinged and tarted up  would have seizure if taken to  Tesco

Offline muskrat

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Re: Swinging arm nut torque setting ?
« Reply #3 on: 02.04. 2012 22:24 »
Ah that's right Bill. I made bronze bushes so had to resort to my method. Think my memory is catching up with yours *smile*.
Cheers
'51 A7 plunger, '57 A7SS now A10CR,  '83 CB1100F, 88 FXST .
Australia
Muskys Plunger A7

Offline Stephen Foster

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Re: Swinging arm nut torque setting ?
« Reply #4 on: 03.04. 2012 07:00 »
Thanks all !
That is the message from the service sheet ... wasnt sure Id undertood it correctly as it sounds strange & ambiguous ?

Steve ..
I own a 1955/56 B.S.A Swinging Arm "Golden Flash" , had it since 1976 .

Offline bsa-bill

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Re: Swinging arm nut torque setting ?
« Reply #5 on: 03.04. 2012 09:29 »
Quote
Think my memory is catching up with yours
Wont be long then Musky, mine keeps stopping for a rest
All the best - Bill
1961 Flash - stock, reliable, steady, fantastic for shopping
1959 Rocket Gold Flash - blinged and tarted up  would have seizure if taken to  Tesco

Offline BSA_54A10

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Re: Swinging arm nut torque setting ?
« Reply #6 on: 03.04. 2012 11:42 »
The idea is to clamp the inner sleeve of the bush so it does not rotate and wear a grove in the pivot so you have to resort to cutting it out next time you change the silent bloc bushes.
Bike Beesa
Trevor

Offline Stephen Foster

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Re: Swinging arm nut torque setting ?
« Reply #7 on: 04.04. 2012 08:36 »
another thing I noticed is the driveside pivot member of the swinging arm appears to be slightly kinked ?
The swinging arm fits perfectly & is correct dimensionally in situ . There is definately no distortion or accident damage .
The kink seems to be original as the opposite side is perfectly flat ?
Anyone seen this before ?

Steve ..
I own a 1955/56 B.S.A Swinging Arm "Golden Flash" , had it since 1976 .