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Old 03-09-11, 10:42 AM   #1
neondave
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Sturmey Archer Dynohub 'keeper ring'

Hi, I purchased a ,what was said to be ,a'keeper ring' off of Epay, a tool used when taking apart a Dynohub.

Can anyone send me a picture of this item? , Ive looked and can't find any, anywhere
Just wondering if this is really what I bought or not. No markings on it.


Havnet tested it either, wheel is at the shop and to be laced to the hub this week

Thankyou,dave
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Old 03-09-11, 10:50 AM   #2
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I saw that auction! But other than the occasional ebay photo, I've never seen one.

Bear in mind, you can do a lot of disassembly on a dynohub without needing the keeper. You can remove the whole dynamo unit, grease all the bearings, and put it all back together, without needing the keeper. Once you have the dynamo unit separated from the hub, and you want to separate the magnet from the armature, hold the keeper up to the magnet; seems to me it should be pretty obvious whether it's the right thing or not. But, then, what do I know!
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Old 03-09-11, 10:54 AM   #3
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Dunno if you've searched around there for pics or not but have a look at www.sturmey-archerheritage.com They've got lots of pics and diagrams..its a great resource for old sturmey mysteries.
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Old 03-09-11, 12:22 PM   #4
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What rhm said.

When I've needed to go so far that I've needed to remove the magnet, I've managed to get by with one of the larger sockets from my 3/4" drive set as a keeper ring. Hasn't failed me yet.
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Old 03-09-11, 01:06 PM   #5
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What rhm said.

When I've needed to go so far that I've needed to remove the magnet, I've managed to get by with one of the larger sockets from my 3/4" drive set as a keeper ring. Hasn't failed me yet.

Yea, I prob shouldnt have spent the $ on that,:-( ... just with all the warnings , etc , I went for it. Yes, Ive had mine apart to clean up dirt & rust and lube,...but I wanted to clean up the armature more, but a little difficult with it in the magnet

Prob just an old piece of random iron,...the seller does have a 100% rating though
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Old 03-09-11, 01:26 PM   #6
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Oh, I don't doubt what you bought is a keeper ring, and I would be glad to have one. When you overhaul your hub and deploy the keeper, please take a few pictures for us! I'd like to see that. I'd like to do the same to one or two of my dynohubs, actually.
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Old 03-09-11, 02:02 PM   #7
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Oh, I don't doubt what you bought is a keeper ring, and I would be glad to have one. When you overhaul your hub and deploy the keeper, please take a few pictures for us! I'd like to see that. I'd like to do the same to one or two of my dynohubs, actually.
Trying to post a pic,..its about 2.74" O.D. , .938" thick (front to back ) ,I.D. is about 1.955"
The I.D. is not machined , all else is. There is also a 'shoulder' machined into it,

(see pic )
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Old 03-09-11, 09:13 PM   #8
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Sturmey tools, with descriptions, 1948.
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Old 03-10-11, 05:12 AM   #9
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That looks like a keeper ring to me. I have been bidding on them on Ebay UK but haven't managed to land one yet. I have and maintain about half a dozen SA dynohubs and it would really come in handy. I may end up having someone fabricate me one. If you have to separate the dyno for testing or cleaning it comes in handy. I have had a couple of hubs that were pretty rusty inside and it would have made the cleaning a bit easier with the keeper ring.

Aaron
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Old 03-11-11, 06:54 PM   #10
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That looks like a keeper ring to me. I have been bidding on them on Ebay UK but haven't managed to land one yet. I have and maintain about half a dozen SA dynohubs and it would really come in handy. I may end up having someone fabricate me one. If you have to separate the dyno for testing or cleaning it comes in handy. I have had a couple of hubs that were pretty rusty inside and it would have made the cleaning a bit easier with the keeper ring.

Aaron
Here are some pics sent to me from the seller, from a Master catalog , looks like the real deal
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Old 03-12-11, 08:48 AM   #11
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That looks like a keeper ring to me. I have been bidding on them on Ebay UK but haven't managed to land one yet. I have and maintain about half a dozen SA dynohubs and it would really come in handy. I may end up having someone fabricate me one. If you have to separate the dyno for testing or cleaning it comes in handy. I have had a couple of hubs that were pretty rusty inside and it would have made the cleaning a bit easier with the keeper ring.

Aaron
You have a Dynohub collection, I've seen pics of hubs with an oil port, my hub has no oil port (1972 ,front hub ), when did they change the design ? Are the 'innards' the same ? If so, next time I have it apart should I drill my own oil port, or leave as is ?
Grease is good ?,
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Old 03-12-11, 09:06 AM   #12
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You have a Dynohub collection, I've seen pics of hubs with an oil port, my hub has no oil port (1972 ,front hub ), when did they change the design ? Are the 'innards' the same ? If so, next time I have it apart should I drill my own oil port, or leave as is ?
Grease is good ?,
Not sure when the oil ports went away 1960's? I just use grease in mine. I have three or four GH6 hubs as well as a few AG and FG rear hubs. They are heavy compared to the new stuff on the market as well as not putting out very many watts. But they look great on a vintage bike.

Aaron
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Old 03-12-11, 09:34 AM   #13
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I have a front dynohub from '56 (I think; the date is a bit ambiguous) that has an oil port, and one from '59 that does not.
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Old 12-21-11, 05:15 PM   #14
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Sorry to resurrect this, but if anyone's interested I had a keeper ring machined. Would've been useful if I'd discovered this thread first to get the actual dimensions! I made it 2.70" instead of 2.74". Seems to work though.
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Old 12-21-11, 06:18 PM   #15
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my experience is that you don't need a keeper with the SA dynohubs because the whole thing comes out. And you want it out to work on the hub.
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Old 12-21-11, 06:56 PM   #16
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Yeah, I've overhauled 3 dynohubs now. 2 of them were easily serviced without needing to remove the armature from the magnet. On the third one the armature was very corroded and need a good scrubbing with a wire brush just get get it to spin freely within the magnet, so it was necessary to remove it.
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Old 12-21-11, 07:03 PM   #17
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my experience is that you don't need a keeper with the SA dynohubs because the whole thing comes out. And you want it out to work on the hub.
Yes the whole thing comes out, but if you want to clean between the magnet and the armature. If you separate them you will have a dead dyno hub, also known as a paper weight.

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Old 12-21-11, 07:07 PM   #18
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http://www.home.earthlink.net/~stein...erchandise.htm

Gentlemen Cyclist now sells reproduction keepers for those of you that might need one for service.
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Old 12-21-11, 07:45 PM   #19
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http://www.home.earthlink.net/~stein...erchandise.htm

Gentlemen Cyclist now sells reproduction keepers for those of you that might need one for service.
Hey Fenway, I don't see what you're referring to. I see the ball cup spanner, but not a keeper ring. Am I missing something?
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Old 12-21-11, 07:54 PM   #20
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Hey Fenway, I don't see what you're referring to. I see the ball cup spanner, but not a keeper ring. Am I missing something?
Coming soon...It is in the text just above the ball cup spanner, I will be ordering one as soon as they come available. I already have the ball cup spanner, steel pulleys, steel fulcrums and the mug.

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Old 12-21-11, 07:58 PM   #21
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Coming soon...It is in the text just above the ball cup spanner, I will be ordering one as soon as they come available. I already have the ball cup spanner, steel pulleys, steel fulcrums and the mug.

Aaron
D'oh!! How'd I miss that? Thanks Aaron!

EDIT: Aaron, what do you think of the ball cup spanner? I've been considering buying one, but haven't done so yet. With my ever growing collection of 3-speeds, I'm thinking it may be a worthwhile investment.
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Last edited by photogravity; 12-21-11 at 08:02 PM. Reason: added question on spanner thingamajig
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Old 12-21-11, 08:44 PM   #22
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D'oh!! How'd I miss that? Thanks Aaron!

EDIT: Aaron, what do you think of the ball cup spanner? I've been considering buying one, but haven't done so yet. With my ever growing collection of 3-speeds, I'm thinking it may be a worthwhile investment.
I haven't used mine yet, I have long been a punch and hammer kind of guy. But I have an FG hub that has to come apart, I am lacing it into a wheel first then will give the ball spanner a try. I figure it can't hurt and it just might make the job easier.

Aaron
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Old 12-21-11, 11:31 PM   #23
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I have the Gentleman Cyclist keeper ring which seems to work well. It helped me clean up a couple of quite mucked up Dynohubs.
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Old 12-21-11, 11:39 PM   #24
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I have the Gentleman Cyclist keeper ring which seems to work well. It helped me clean up a couple of quite mucked up Dynohubs.
Very authentic and nice looking replica. Wish I had added the 0.04" to the diameter of mine!
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