Author Topic: A10swing arm identification  (Read 1443 times)

Offline Plammimam

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Re: A10swing arm identification
« Reply #15 on: 25.10. 2018 23:08 »
It seems the plunger set up would work other than a bearing change needed. Does anyone know the dimensions of the plunger spacer. Theory it should be the correct length but wrong ID

Offline morris

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Re: A10swing arm identification
« Reply #16 on: 26.10. 2018 08:18 »
Plam, I suddenly got unsure if the dimensions I gave you are correct...  :-\
I dug up some notes I made long ago and it seems that a plunger shaft might be 7/8 instead of 1" ???
I'll get the shaft out for you tonight and make some measurements
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'52 BSA A 10 Plunger
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Online Greybeard

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Re: A10swing arm identification
« Reply #17 on: 26.10. 2018 09:16 »
I'll measure mine (axle) as well.

Offline duTch

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Re: A10swing arm identification
« Reply #18 on: 26.10. 2018 10:03 »

 Plunger axle is 7/8" (0.875), but I've lost tabs of the r/h spacer for length but it's on here somewhere....Plunger bearings & spacer setup is different also- ID's is axle size, and spacer is between the bearings, but the S/A spacer is stepped and fit inside the bearings  (probably telling at least some of what you already know)....Mix & match can be a bitch *work*, and usually just easier to run the stock items, but that's what you need to know.... *spider*

 If you want to persist with what you have, I think as suggested you just need to make the bits to suit  *conf2*
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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Offline Plammimam

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Re: A10swing arm identification
« Reply #19 on: 26.10. 2018 10:15 »
Thanks guys for all the info

Offline Plammimam

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Re: A10swing arm identification
« Reply #20 on: 26.10. 2018 10:41 »
Here’s a thought, if you distill this thread down there are two parts to it

1. The right side swing arm lug has a 1 inch slot

I don’t believe we ever potentially found a swing arm with that size lug, only a plunger axle was mentioned for size applicability .

2. Find the right length right wheel spacer

For this one there are three parts in play to span the 7 inch space between the lugs

   Left stub axle
   Centre bearing carrier and right
   Right wheel spacer

Whist I concentrate on the right wheel spacer the other two items could be wrong or there is a space somewhere between one of these items. I am looking for 0.17 extra space to fit a standard right wheel spacer.

Don’t you just love a puzzle

(I am ignoring the axle diameter for now)

Offline duTch

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Re: A10swing arm identification
« Reply #21 on: 26.10. 2018 11:18 »

 
 Do you have the spacer #45 that sits on the left stub axle between the brake plate and chainwheel bearing ? That should be roughly about 1/4" wide (there's a few different types and maybe a 'top-hat' or square section profile)...
        Also how is the brake plate anchored ?
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

Online berger

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Re: A10swing arm identification
« Reply #22 on: 26.10. 2018 12:51 »
dutch you are a star, get you a beer for that *beer* and some of that karma sutra stuff because I can't do piccies-------yet!!!!! . I have measured some bits and mine is a 54/55 swing arm , even though this doesn't answer the wider hole where the spindle goes through the  swing arm....- here goes number 30-- 1/9/16ths number 29-- 17/64 or maybe originaly a 1/4 and its grown / spread a bit haha.-32 is 8/7/8ths with 1/1/8th thread and a 6 inch long length from the shoulder to the threads, and is 11/16ths diameter. bearings are RLS 7-2RS 2 inch dia 7/8 inner--- 7 inch between swing fork, maybe this helps  *dunno* but I do know the stub axle that the spindle screws into is shorter than A 65 stub axle,,,, its now nearly time for the barlypop shop *beer* edit / swing arm hole a clearance fit for the spindle about 45/64ths give or take a bit of paint

Online berger

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Re: A10swing arm identification
« Reply #23 on: 26.10. 2018 13:05 »
whoops a daisy forgot---- number 29 fits on the bearing carrier inside the dust cap and up to the inner race and number 30 butts up to that

Offline Plammimam

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Re: A10swing arm identification
« Reply #24 on: 26.10. 2018 13:22 »
Hi
Spacer 45 is in place, that was the start of the issue. Found left wheel nut loose, so tightened and wheel stop turning. Purchased from CPC engineering top hat version around 1/4 inch. Solved the lock up and did not move the back plate that I could see.
Attached is a photo of the torque bar, slaved in position for visibility. This attaches to a welded plate just out of picture with two bolts. I do not have any washers between back plate and swing arm.

Online berger

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Re: A10swing arm identification
« Reply #25 on: 26.10. 2018 14:28 »
can't see on your first post picture but how long is that stub axle , there are two different ones, I know this doesn't sort out the frame lug size but this seems as dutch says a mixed bag, also what size slot in the sprocket side of swing arm

Offline Swarfcut

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Re: A10swing arm identification
« Reply #26 on: 26.10. 2018 14:33 »
 

    That rear sprocket looks very much like a 49 Tooth "Dinner Plate" plunger type. berger mentioned the shaft to be 11/16" diameter, but the bearing ID to be  7/8". We would expect shaft diameter to closely match bearing ID..  It may have been originally set up with a plunger wheel and brake drum, to get a big sprocket for low speed torque and with a pre Ariel Hub S/A  brake plate adapted to fit the plunger drum. A picture of the inside of the drum would help. Centre hole  on brakeplate side of the drum is smaller on a S/A drum. The larger plunger hole has an extra pressed in collar to act as a grease/dust seal around the shaft.  Plunger and S/A wheel bearings are the same. This bearing is also used on S/A drum.  Plunger drum uses a larger ID bearing.

  Swarfy.

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Re: A10swing arm identification
« Reply #27 on: 26.10. 2018 15:17 »
Probably too late now but I have my original Plunger rear axle here. I'm seeing a diameter of 0.873" on the unworn parts.

If it's useful I'll take the back wheel out and measure the axle components. Just give me a shout.

Offline Plammimam

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Re: A10swing arm identification
« Reply #28 on: 26.10. 2018 19:05 »
Wow nothing like home work guys, no pain no gain as they say here are the answers to the various questions. I will post the pictures with a couple of replies in a moment

Stub axle length, this is an approximation with out removing 3 1/4, diameter 7/8
Left swing arm slot 0.681
Sprocket teeth 46
Back plate hole 0.878
Bearing in hub OD 2 inch ID 7/8
Total hub width from outside edge of spline to outer edge of right side hub 4 1/8
Stepped spacer hub bearings sit on is 3.450 length

Offline Plammimam

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Re: A10swing arm identification
« Reply #29 on: 26.10. 2018 19:06 »
Pictures