Author Topic: BSA A10 clutch push rod length  (Read 6796 times)

Online RichardL

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Re: BSA A10 clutch push rod length
« Reply #15 on: 06.02. 2010 16:31 »
LJ, et al,

Reading form our long log of A7/A10 tricks, techniques and little-known facts, I was looking back at the 11 August 2008 post that says that the ball on the end of the the screw in the clutch operating lever (inside the gearbox) should roll free in its captivity. Is this a fact to a certainty, because mine doesn't, I haven't figured out how to fix it without ruining the screw, and, once again, I am impatient to complete the reassembly.

Thoughts, facts and insults welcomed

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 trevinoz

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Re: BSA A10 clutch push rod length
« Reply #16 on: 06.02. 2010 20:48 »
Richard,
               I am sure the ball should be free to roll.
I have several examples which are worn badly and the ball is locked solid.
I have some new ones and they are free excepting one. I put this down to the generally poor quality control of pattern parts.
As to a fix, throw it away and get a new one.
Trev.

Online RichardL

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Re: BSA A10 clutch push rod length
« Reply #17 on: 06.02. 2010 22:03 »
Trev (and LJ),

Thanks, very much. I will acquire a new one. In thinking about whether it should spin or not, I forgot how easy it is to replace after assembly.

In the process of all this I also decided my clutch rod was too short, a residue from when I assembled the gearbox in 2005 and knew even less than I do now. I went with the ball-bearing-in-the-middle-of-the-rod trick and that seems to have it at a good length. I also hardened all four rod ends. I didn't get too exotic with the hardening procedure, but I think I got them hard enough, heating them with a mapp/oxygen torch and quenching in ATF. I read somewhere that ATF did a fair job in quenching, being a refined mineral oil. In this application, "good enough" is probabaly good enough.

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 David

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Re: BSA A10 clutch push rod length
« Reply #18 on: 09.07. 2016 14:31 »
I know that this is an old thread and I hope that someone picks up on it. I have 57 Road Rocket that I've had for many years. I had the gearbox overhauled by SRM over 20 years ago and have started putting the bike back together over past couple of years. I'm pleased to say that it's very near to completion. Yesterday, I started building the clutch. I went for a Triumph 4 spring cush-drive clutch. The push rod engages with the clutch face plate by the use of a small 'Top Hat' shaped fitting. At the outset, the clutch rod appeared to be too short, but delving further, I have found references in a BSA Service Manual to the fact that there is a steel ball that sits in between the grub screw in the clutch operation arm and the end of the rod. (gearbox end)  I can't seem to find any reference the ball in any BSA manuals and yet there is a consensus amongst friends that the ball should be there. I'm wondering if I should just find a ball of suitable size and drop it into the shaft prior to inserting the clutch rod. I eagerly await any advice please? Thanks.

Online bsa-bill

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Re: BSA A10 clutch push rod length
« Reply #19 on: 09.07. 2016 15:26 »
used to be a common mod to cut the pushrod in two and insert a ball in the centre to allow some movement, however you may be talking about the ball in the end of the pushrod adjuster as seen in this pick (65-3403) and available here for a little bit more than a fiver
Quote
http://www.draganfly.co.uk/index.php/bsa/bsa/a710--b3133--c101112--m202133/category/909-4-spring-triumph-type-with-cush-drive
other suppliers are available also
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 David

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Re: BSA A10 clutch push rod length
« Reply #20 on: 09.07. 2016 15:30 »
Bill, I can't see a ball in the picture. Is it captive in the adjuster of does it just drop in?

Online bsa-bill

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Re: BSA A10 clutch push rod length
« Reply #21 on: 09.07. 2016 16:06 »
yes captive, I think I read on here of it being replaced (anyone aware of how to) but for the price I would not consider it worthwhile, from memory (dodgy) I think I replaced the whole thing last job I did (everything in the pic except the lever)
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 David

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Re: BSA A10 clutch push rod length
« Reply #22 on: 09.07. 2016 16:41 »
I had the gearbox refurbished and presume that they replaced it. I will have to take off the inspection panel and have a look. I was reluctant to do it because it was sealed with compound.

Online ellis

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Re: BSA A10 clutch push rod length
« Reply #23 on: 09.07. 2016 20:52 »
Hi David,

Open it up and take a look to be sure. Just slacken the clutch cable off and turn the arm out and you will see the adjuster and the ball bearing is peened on to the adjuster thread. If not I got mine from Draganfly in Bungay Suffolk Tel 01986 894798 for about a fiver. Just a light smear of gasket goo is all the cover plate needs. 

Offline chaterlea25

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Re: BSA A10 clutch push rod length
« Reply #24 on: 09.07. 2016 21:00 »
Hi David,
The adjusting screw will need to be set once the bike is together,
the angle of the arm/ cable and the alignment of the adjusting screw to the pushrod is vital to get a good
clutch operation
Do a forum search and or look up the relavent service sheet

John
1961 Super Rocket
1963 RGS (ongoing)

Offline duTch

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Re: BSA A10 clutch push rod length
« Reply #25 on: 09.07. 2016 23:59 »
Quote
I will have to take off the inspection panel and have a look. I was reluctant to do it because it was sealed with compound.

 Don't be scared to remove an inspection cover, that's what they're for *smiley4*; and you'll need to take it off to check if there's oil in there, and add if necessary.
Started building in about 1977/8 a on average '52 A10 -built from bits 'n pieces never resto intended -maybe 'personalised'
Have a '74 850T Moto Guzzi since '92-best thing I ever bought doesn't need a kickstart 'cos it bump starts sooooooooo(mostly) easy
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Online RichardL

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Re: BSA A10 clutch push rod length
« Reply #26 on: 10.07. 2016 00:38 »
I think Dutch means that you will check for oil by removing the overflow indicating plug from the gearbox cover and adding a bit of oil until some comes out of that hole. So, David, that's one sealed plate that will be coming off somewhat regularly. 

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 duTch

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Re: BSA A10 clutch push rod length
« Reply #27 on: 10.07. 2016 07:00 »

 
Quote
I think Dutch means that you will check for oil by removing the overflow indicating plug from the gearbox cover and adding a bit of oil until some comes out of that hole. So, David, that's one sealed plate that will be coming off somewhat regularly.

Richard L.

 But in addition, the Inspection cover can be easily removed periodically to inspect if there is a good amount of oil in there ;)...(note to self *eek*)
Started building in about 1977/8 a on average '52 A10 -built from bits 'n pieces never resto intended -maybe 'personalised'
Have a '74 850T Moto Guzzi since '92-best thing I ever bought doesn't need a kickstart 'cos it bump starts sooooooooo(mostly) easy
Australia

Offline David

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Re: BSA A10 clutch push rod length
« Reply #28 on: 10.07. 2016 17:11 »
Thanks to all that replied to my quest. I have the gearbox cover off and I realise that the ball is actually captive inside the grub screw. I kept hearing about the ball and assumed that it was a separate item. The rod is 11 9/16" and is too short. I have to get the 12" one. Thank you all again. David.

Online RichardL

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Re: BSA A10 clutch push rod length
« Reply #29 on: 10.07. 2016 18:24 »
You could cut in half and put two 1/4" ball bearings in the miidle, then, trim one section to fit. Don't forget to harden four ends.

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.