Author Topic: clutch chainwheel  (Read 1518 times)

Offline Tumbleweed

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clutch chainwheel
« on: 28.12. 2015 14:36 »
hello again everyone , I  am fitting the clutch to my 59 a10 , on fitting the chainwheel there seems to be a lot of play even after tightening the clutch centre nut very tight ,   is this normal if it is how much play should there be , thanks   tw
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Offline chaterlea25

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Re: clutch chainwheel
« Reply #1 on: 28.12. 2015 16:49 »
HI TW,
Which clutch ??
Photos please

John
1961 Super Rocket
1963 RGS (ongoing)

Offline Tumbleweed

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Re: clutch chainwheel
« Reply #2 on: 28.12. 2015 17:51 »
sorry john  I cant show any pics , its a 6 spring clutch and my bike is 59 a10 sw/arm  the centre is tight enough but the chainwheel is not so tight it feels as if something is missing the bearings are all in place , I am rebuilding it from a basket case following the Haynes manual  ,  thanks   tw
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Online RichardL

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Re: clutch chainwheel
« Reply #3 on: 28.12. 2015 18:58 »
TW,

Others may have a better explanation for this, but, as I see it, the basket will not be stable until the clutch is assembled. The double-row of ball bearings only hold the radial position of the basket. I think the basket can still teeter (so-to-speak) until the whole clutch is assembled and the pressure of the plates hold it in place.  I may be forgetting something here (I have done that before while thinking I had the right answer), so I am prepared for being corrected.

by the way, I don't know if it is even possible to put the clutch hub in as shown in the Haynes diagram, because they show it backwards, as does the BSA parts book.

Richard L.
Plan on signing up for the world-wide 2020 DISTINGUISHED GENTLEMAN'S RIDEon September 27, 2020. This year it's a solo or pillion ride in dapper attire. Watch website at https://www.gentlemansride.com for details.


Offline Tumbleweed

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Re: clutch chainwheel
« Reply #4 on: 28.12. 2015 20:17 »
so they do Richard l ,  I thought it was just me reading it wrongly  ,  thanks I will get it assembled and see if the teeter is any better  ,   cheers  tw
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Offline chaterlea25

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Re: clutch chainwheel
« Reply #5 on: 29.12. 2015 00:51 »
HI TW,
Ok,
A point to look at, is the inner race a good tight fit on the shaft adaptor?
A lot (most ) pattern races are about 15 thou oversize  *eek* so loose on the adaptor
I believe the bearing from draganfly is an improvement ?? see recent posts on this

HTH
John
1961 Super Rocket
1963 RGS (ongoing)

Offline Tumbleweed

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Re: clutch chainwheel
« Reply #6 on: 29.12. 2015 11:38 »
point taken   
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Offline Rocket Racer

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Re: clutch chainwheel
« Reply #7 on: 30.12. 2015 05:54 »
I have yet to find the improved draganfly bearing referred to, but in the attached image taken from draganfly's site, the ball bearing sleeve 17 can be moved within the basket to improve the bearing location.

The std ball and cage arrangement is awful but with a bit of patience can be made to work satisfactorily. The poor bearing design in conjunction with the narrow push rod both conspire to make getting  clean plate separation difficult.

The aim is to minimise basket wobble, but this was a budget bearing and that is a reasonable challenge if assembling from odds and sods.

Keep us posted how you get on.

A good rider periodically checks all nuts and bolts with a spanner to see that they are tight - Instruction Manual for BSA B series, p46, para 2.
New Zealand

Offline Tumbleweed

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Re: clutch chainwheel
« Reply #8 on: 30.12. 2015 08:31 »
hi rocket racer,     I have just sent for one of the bearings from dragonfly I think the part was number 18 , hope to have it here in a couple of days ,   I will assemble it all and see if it stops the play a bit        tw
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Offline bikerbob

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Re: clutch chainwheel
« Reply #9 on: 30.12. 2015 10:58 »
I have one of those improved Draganfly bearings fitted in my 1956 A7 just had the primary dismantled to cure oil leak from gearbox and can confirm that the bearing runs OK after one year and without the clutch plates fitted just the center nut tightened there is no lateral play on the clutch chainwheel.

Offline Tumbleweed

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Re: clutch chainwheel
« Reply #10 on: 30.12. 2015 12:22 »
that's good news to me bikerbob.
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Offline Rocket Racer

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Re: clutch chainwheel
« Reply #11 on: 30.12. 2015 20:13 »
that sounds like a good plan *smile*
keep us posted
A good rider periodically checks all nuts and bolts with a spanner to see that they are tight - Instruction Manual for BSA B series, p46, para 2.
New Zealand

Offline Tumbleweed

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Re: clutch chainwheel
« Reply #12 on: 12.01. 2016 20:45 »
hi, rocket racer.  the diagram you sent of the a10 clutch,  where does  number 17 bush go ?  I am fitting the dragonfly bearing     and I put on the back plate then the chainwheel and bearing    but the bearing doesn't look as if both races are being used , there is quite a lot showing inside the chainwheel as if I have missed a bush out is it  17  or does that fit inside the chainwheel body  ,  the original bearing was the same so its not the  dragonfly bearing  can anyone let me know if it should sit like that . also while I am here what is number 13 on the drawing    thanks  pp
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Offline chaterlea25

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Re: clutch chainwheel
« Reply #13 on: 12.01. 2016 21:10 »
HI TW,
Number 13 is the scroll that supposedly keeps in the oil, it is pressed onto the taper adaptor
Number 17 is the bearing outer race, it should be a tight fit in the chainwheel, final positioning is somewhat of a compromise ?? where it does not keep the chainwheel friction material away from the rear plate

HTH
John
1961 Super Rocket
1963 RGS (ongoing)

Offline Tumbleweed

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Re: clutch chainwheel
« Reply #14 on: 13.01. 2016 08:15 »
thanks john, number 13 was missing from the box marked "clutch bits" in my basket case ,  so it doesnt look to me as if there is anything else missing the bearing outer race is much narrower than the bearing it seems odd to me ,        tw
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