Author Topic: An odd ring  (Read 505 times)

Offline Steverat

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An odd ring
« on: 12.01. 2019 20:05 »
This is a hardened steel ring, 30mm inside diameter.
It bears inscriptions SKF and HUP209.
I found it in the bits box which came with Josef's bike, it might or might not be related!

Does anyone know what it is?
Is it a vital engine or gearbox part for an A10?

1951 BSA A10 - now returned to Germany
1972 Triumph T100R Daytona
1924 B-S SS80
1965 Triumph SH Cub
1960 AJS M18CS

Offline Greybeard

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Re: An odd ring
« Reply #1 on: 12.01. 2019 22:08 »
I don't recall having one of them on my bike.

Offline Steverat

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Re: An odd ring
« Reply #2 on: 12.01. 2019 22:18 »
It would have to go in a heavier part of the machine, most of that is already assembled:-

1951 BSA A10 - now returned to Germany
1972 Triumph T100R Daytona
1924 B-S SS80
1965 Triumph SH Cub
1960 AJS M18CS

Online duTch

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Re: An odd ring
« Reply #3 on: 12.01. 2019 22:22 »

 
Quote
..I don't recall having one of them on my bike...
....me either

 30mm is the same size as the drive main journal, so maybe was an unnecessary bodge behind the cush sleeve...either that or a neatly self-destructed bearing *conf2*- otherwise no idea
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 RichardL

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Re: An odd ring
« Reply #4 on: 12.01. 2019 22:30 »
Take a look here. I'm not sure what the extra ring is for, but it's part of the NUP209 bearing.

http://www.rfq-bearing.com/bearings-NUP-209-ECM-SKF-NUP-209-ECM.html

Richard L.
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Offline berger

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Re: An odd ring
« Reply #5 on: 12.01. 2019 22:30 »
I went to the pub I am now a witness to an assault  *pull hair out* *bash* *whistle* skf is skefco or skefko as I understand bearing makers *beer*

Offline Greybeard

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Re: An odd ring
« Reply #6 on: 12.01. 2019 23:15 »
Take a look here. I'm not sure what the extra ring is for, but it's part of the NUP209 bearing.

http://www.rfq-bearing.com/bearings-NUP-209-ECM-SKF-NUP-209-ECM.html

Richard L.
Ah, so you think that 'H' is an 'N'

Is it that bit on the right of this picture?

Online RichardL

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Re: An odd ring
« Reply #7 on: 13.01. 2019 00:51 »
Gotta be. Maybe a different take on the drive-side bearing?

Richard L.
Plan on signing up for the world-wide 2017 DISTINGUISHED GENTLEMAN'S RIDE on September 30, 2018. Watch website at https://www.gentlemansride.com for details.

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Re: An odd ring
« Reply #8 on: 13.01. 2019 05:04 »
 
Quote
.Ah, so you think that 'H' is an 'N'..

 I think the 'H' is definitely an 'N' , but I thought the 'U' is an 'O'....(NOP 209  NE). .. easily *conf2*

 Ps bergs- this was done while doing a quick potato/ ponytail/ pistol/ stupid spell suggestions- friggin *PITSTOP* at a *friggin pub*


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 Steverat

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Re: An odd ring
« Reply #9 on: 13.01. 2019 05:29 »
The H could be an N but the U is a U

1951 BSA A10 - now returned to Germany
1972 Triumph T100R Daytona
1924 B-S SS80
1965 Triumph SH Cub
1960 AJS M18CS

Offline Swarfcut

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Re: An odd ring
« Reply #10 on: 13.01. 2019 09:30 »
 Steve, I reckon GB's diagram nails it as part of a possible answer. The design appears to allow the rollers to stay in the case, the crank pokes through and the ring is the inner part of the outer axial support for the rollers. If we are right there should be a nice even witness mark around the  periphery of the ring where the rollers have been.  As a design alternative it is a clever trick, avoiding damage to the cage and rollers as the inner race is taken on and off to shim up and set the minimum running clearance to the face of the timing bush, as once assembled there will be no end float apart from the axial clearance in the bearing as the rollers are  supported "top and bottom and both sides" The only weakness is the ever critical tightness of the big  nut pushing the inner cush drive sleeve and the ring hard up against the bearing inner. If you still have the original main bearing to hand, see if the ring fits.

  The only other part that looks remotely like that ring is the rear sprocket hub collar, 67 6078 which fits in the centre of the brake drum/sprocket, around the rear spindle. No need to remove this on a regular basis, most are "rusted" in place into the drum. It is just a plain metal ring, no posh numbers. If yours is in place, then this mystery bit is spurious to your build. Otherwise this part may have been fitted there as a codge.

  Admiring your hard work and attention to detail. Josef is in for a treat.

  Swarfy.

Offline RDfella

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Re: An odd ring
« Reply #11 on: 13.01. 2019 16:48 »
Indeed it is the inner ring of a single row cylindrical roller bearing. Cannot see your number, but NUP 206 had a 30mm ID and a 38.5mm OD. SKF is a major bearing manufacturer.
'49 B31, '49 M21, '53 DOT, '58 Flash, '00 Firestorm, Weslake sprint bike.

Offline chaterlea25

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Re: An odd ring
« Reply #12 on: 13.01. 2019 17:54 »
Hi All,
That type of bearing is used on the timing side of T140 engines
Cannot remember the bearing number offhand though??
John
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Offline Servodyne

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Re: An odd ring
« Reply #13 on: 13.01. 2019 18:34 »
It certainly looks more like a NUP206 to me.
With this type of bearing you wouldn't need to shim the crank as this bearing will control the end float. Probably the bearing to use, if you have an end feed crank and needle roller timing side bearing without an integral ball race.
1957 BSA A10 Spitfire
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1971 BSA A70 Lightning
1975 Norton Commando

Offline Steverat

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Re: An odd ring
« Reply #14 on: 16.01. 2019 04:54 »
Thanks for all the research and ideas gents. Yes it does have some rubbing contact on the other side but not in the location which GB’s diagram might suggest. In any event I am convinced now that it was on the drive side main which is no more. I shall keep it as a smooth key fob and a reminder of the possibilities when I do my next engine.

1951 BSA A10 - now returned to Germany
1972 Triumph T100R Daytona
1924 B-S SS80
1965 Triumph SH Cub
1960 AJS M18CS