neondave

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

rhm

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!

Zaphod Beeblebrox 

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.

bikamper

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.

neondave

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

rhm

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.

neondave

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 )

tcs

Sturmey tools, with descriptions, 1948.

wahoonc

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

neondave

Here are some pics sent to me from the seller, from a Master catalog , looks like the real deal

neondave

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 ?,

wahoonc

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

rhm

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.

minisystem

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.

unterhausen

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.

minisystem

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.

wahoonc

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.

Aaron

Fenway

https://www.home.earthlink.net/~stein...erchandise.htm

Gentlemen Cyclist now sells reproduction keepers for those of you that might need one for service.

photogravity

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?

wahoonc

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

photogravity

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.

wahoonc

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

folderfan550

I have the Gentleman Cyclist keeper ring which seems to work well. It helped me clean up a couple of quite mucked up Dynohubs.

minisystem

Very authentic and nice looking replica. Wish I had added the 0.04" to the diameter of mine!