Author Topic: QD Rear Wheel  (Read 504 times)

Online Slymo

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QD Rear Wheel
« on: 16.09. 2018 07:26 »
Putting the wheels on this frame so I can establish where to braze the sidestand lug I examined the rear wheel for the first time. The stub axle that holds the rear sprocket in place has a journal that is longer than the 5/8" thick bearing that it goes through. This means that when all bolted up there is play back and forth in the sprocket. Ive assumed that this is a case of a missing spacer and have made a .210" shim to take up the travel but it occurs to me that this may be wrong. The parts manual seems to have various dust protectors but no spacers that I can see. Is there supposed to be float back and frth on the sprocket without the wheel attached?
NZ

Offline duTch

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Re: QD Rear Wheel
« Reply #1 on: 16.09. 2018 07:58 »

 Probably need to specify Plunger or  Swing-arm QD wheel (similar but vastly different), but there should be a spacer between the bearing and brake plate about 1/4" thick
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 Slymo

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Re: QD Rear Wheel
« Reply #2 on: 16.09. 2018 12:23 »
Of course sorry its a 58 Super Rocket, swingarm. The brake plate is on the other side of the wheel though. What I am referring to is the sprocket side which without my spacer has just shy of 1/4" float with the bearing sliding back and forth on the stub axle that appears to have a space 200 odd thou wider than the .625 bearing that is the correct one for the job according to the parts book. Of course the space is taken up once the wheel is attached with the brake drum and wasted spacer. Seems odd to have the sprocket side floating at all though.
NZ

Offline duTch

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Re: QD Rear Wheel
« Reply #3 on: 16.09. 2018 12:28 »

 It doesn't sound much like a QD hub then....I reckon some pics will help others help you- out of my league
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 muskrat

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Re: QD Rear Wheel
« Reply #4 on: 16.09. 2018 13:39 »
G'day Slymo.
Yours is not a QD hub. It's a cast iron full width. https://tinyurl.com/yaucnrra are you missing 42-6105 rear hub grease retainer?
Cheers
'51 A7 plunger, '57 A7SS now A10CR,  '83 CB1100F, 88 FXST .
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Online JulianS

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Re: QD Rear Wheel
« Reply #5 on: 16.09. 2018 13:50 »
Sounds like it is missing the collar which fits between the sprocket bearing and swinging arm 42 6324.

Online Slymo

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Re: QD Rear Wheel
« Reply #6 on: 18.09. 2018 21:57 »
Sorry for the previous mis naming. I assumed that as it comes apart without requiring removal of the sprocket it was a quick detachable but I do remember from a B44 that I had that the QD is a different beast. The grease retainer is there but when it’s all bolted up it still leaves about 900 thou of space of which the bearing on takes .675”. I wonder if the retainer I have is wrong and requires a rebate to pull up the stub axle? I’ve machined a spacer disk that fits on the inside of the bearing but will take it apart again and reassess. S:)
NZ

Online Slymo

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Re: QD Rear Wheel
« Reply #7 on: 19.09. 2018 00:06 »
Actually from your photo above you can see the bright section of the stub axle which relates to the area that the bearing misses. What usually goes there?
NZ

Online JulianS

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Re: QD Rear Wheel
« Reply #8 on: 19.09. 2018 18:34 »
Nothing goes in there. The stub spindle and sprocket are aligned by tightening the large nut and the 4 sprocket nuts. The spindle does not pull up so that its shoulder meets the bearing. The cross section below shows the psoition and fitting. You can see the space.

Online Slymo

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Re: QD Rear Wheel
« Reply #9 on: 19.09. 2018 21:45 »
Thanks to all for your input. So from this excellent drawing it would seem that when the wheel is removed and the sprocket is still in place on the swing arm it will move back and forth on the stub axle. is this familiar to everyone or do I have a particularly warn stub axle?
NZ

Offline duTch

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Re: QD Rear Wheel
« Reply #10 on: 20.09. 2018 09:34 »

 I came to suggest maybe you could rename this topic to something more exact like ' Rear wheel-Not QD'...?

 but while I'm here, I have to warn you that everything you say may be taken as worn out evidence  *conf*

 
Quote
.........or do I have a particularly warn stub axle?....
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 JulianS

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Re: QD Rear Wheel
« Reply #11 on: 20.09. 2018 11:55 »
Wear should be self evident. You may find the sprocket will wobble side to side with wheel removed but when it is all bolted, given parts in good condition,  up there will be no play.


Offline LJ.

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Re: QD Rear Wheel
« Reply #12 on: 20.09. 2018 15:18 »
Just be sure that the bearing lock ring (part no: 42-6335) is very tight, it can come undone and give some play. I can't remember what as it was some time ago but I found that this part coming loose gave me some trouble.
Ride Safely Lads! LJ.
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1940 BSA M20 500cc Girder/Rigid- (SOLD)
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1949 BSA A7   500cc Girder/Plunger Star Twin-(SOLD)
1953 BSA B33  500cc Teles/Plunger-Maroon
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