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'67ish Sturmey Archer DynoHub question

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'67ish Sturmey Archer DynoHub question

Old 07-09-12, 01:55 PM
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'67ish Sturmey Archer DynoHub question

I'm wondering if a DynoHub is likely to still work? How would I test it without having a suitable light? If it doesn't work, is it worth fixing? I have several on Raleighs in various states of repair. The one on my '67 Suberbe is very draggy and I wonder, if I'm going to be repacking the hub anyway is it worth fixing the electrical part and finding a light.

Thank you
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Old 07-09-12, 02:41 PM
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The internet is full of warnings of how to ruin them; take the magnet out of the armature, for example, and it demagnetizes....

But I have yet to encounter one that didn't work fine. You have to use them with the correct Sturmey Archer light bulbs, which are 1.8W; the 2.4 W bulbs made for other dynamos will not give much light with a dynohub. You can use LEDs, though, which make a lot of light.

Does your hub feel draggy, or notchy? The 'notchiness' results from the dynamo having magnets in it. They make it hard to turn the axle but don't actually slow you down.
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Old 07-09-12, 03:26 PM
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I have had my hands on over 50 dynohubs in my life time, only one was bad because of a broken wire in the winding somewhere. If it is built into a wheel, clamp it into a fork and put a volt meter on it and give it a spin, you should get a reading. I don't recall what right off hand. They all feel like they have drag, but repacking the bearings is always a good thing. FWIW I have at least 4 in current use, some of them are still pushing the original lights a couple have been upgraded to LED lights. The dyno hub has no problems pushing LED lights and I think it does better with those than with the old incandescent.

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Old 07-09-12, 06:27 PM
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Thanks you guys, is there a tutorial on how to repack them without ruining them? And how does one go about converting them to LED? I am electrically challenged.
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Old 07-09-12, 06:47 PM
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Originally Posted by Mexican Street Dog View Post
Thanks you guys, is there a tutorial on how to repack them without ruining them? And how does one go about converting them to LED? I am electrically challenged.
On the former question, I think there's something on Sheldon Brown's website, and an ancient Sturmey Archer manual is here. The dynamo unit is held into the hub by four long bolts with nuts that are easy to lose, so be careful there. Take them off and the whole dynamo unit --armature and magnet together-- will drop out. Don't separate them; but don't worry, they won't separate unless you actually try to separate them, which we will assume you won't do.

On the latter question, you don't have to do anything to the hub; it's the lights. I've converted a couple myself; I described the process in this post with a little more detail here. People have been bugging me to do a better writeup but frankly you're better off searching for posts by forum member 'minisystem' who knows this stuff way better than I do.
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Old 07-09-12, 06:49 PM
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Originally Posted by Mexican Street Dog View Post
Thanks you guys, is there a tutorial on how to repack them without ruining them? And how does one go about converting them to LED? I am electrically challenged.
On the former question, I think there's something on Sheldon Brown's website, and an ancient Sturmey Archer manual is here. The dynamo unit is held into the hub by four long bolts with nuts that are easy to lose, so be careful there. Take them off and the whole dynamo unit --armature and magnet together-- will drop out. Don't separate them; but don't worry, they won't separate unless you actually try to separate them, which we will assume you won't do.

On the latter question, you don't have to do anything to the hub; it's the lights. I've converted a couple myself; I described the process in this post with a little more detail here. People have been bugging me to do a better writeup but frankly you're better off searching for posts by forum member 'minisystem' who knows this stuff way better than I do.

Last edited by rhm; 07-09-12 at 06:50 PM. Reason: duplicate post. I don't know how or why. So solly.
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Old 07-09-12, 08:30 PM
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I just built a wheel for my Superbe using a 1948 Dynohub.

It works fine.

To test before building, just attach a voltmeter to the terminals and give the hub shell a spin. If the voltmeter jumps, it should work.
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Old 07-10-12, 11:14 AM
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You guys are awesome as usual!
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Old 07-10-12, 01:08 PM
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This link is for building a wind generator from a dynohub, but it has some nice videos of testing dynohubs, and links to some rebuilding info.
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Old 07-12-12, 05:38 PM
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So I opened up this DynoHub and found this,





So, it turns, but barely. Can I take the magnet/armature assembly out of the Magnet Cover Plate (GL611) to clean around it? I generally use kerosene and I have compressed air at work. The Magnet Spacer Ring does not want to come out but I guess it can stay in the shell. I'll just clean in there as best I can. Also, what is the thread on the axle? I think the previous owner put something on that wasn't right. I also think he didn't know that Raleigh hubs are different to adjust. I dunno, this whole axle is messed up, the dynamo side lock washer is all mashed onto the threads too. Ah bicycles!! Gotta love 'em.

So, what do you think? I guess I'll clean it up and put it back together and I bet it'll work just fine.
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Old 07-12-12, 06:15 PM
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Originally Posted by Mexican Street Dog View Post
So I opened up this DynoHub and found this,





So, it turns, but barely. Can I take the magnet/armature assembly out of the Magnet Cover Plate (GL611) to clean around it? I generally use kerosene and I have compressed air at work. The Magnet Spacer Ring does not want to come out but I guess it can stay in the shell. I'll just clean in there as best I can. Also, what is the thread on the axle? I think the previous owner put something on that wasn't right. I also think he didn't know that Raleigh hubs are different to adjust. I dunno, this whole axle is messed up, the dynamo side lock washer is all mashed onto the threads too. Ah bicycles!! Gotta love 'em.

So, what do you think? I guess I'll clean it up and put it back together and I bet it'll work just fine.
I had one like that. I soaked it in vinegar for a while to get rid of the rust, but I have the keeper ring needed to preserve the magnet when separated from the armature. Before you get too carried away with it, check the armature windings for a short circuit. If it has shorted out, it's probably a lost cause.
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Old 07-12-12, 06:44 PM
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Yeah, soak it in vinegar (or oxalic acid, or ... ) to get the rust out; neutralize the oxalic acid if you go that route; shake it dry, and oil thoroughly. You don't need to take it apart. I wouldn't expect it to turn easily at this point.
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Old 07-12-12, 07:30 PM
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It's good to know about the vinegar. I had one (my only one) like that. In addition to notchy, it was also gritty when turned. A lot of WD40 and some very fine sandpaper between the magnet and armature did the trick. It works smoothly now.
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Old 07-13-12, 04:29 PM
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Originally Posted by PatrickZ View Post
It's good to know about the vinegar. I had one (my only one) like that. In addition to notchy, it was also gritty when turned. A lot of WD40 and some very fine sandpaper between the magnet and armature did the trick. It works smoothly now.
That is what I do with mine, but usually use PB Blaster.

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