On 5/18/2020 7:44 PM, AMuzi wrote:
On 5/18/2020 4:22 PM, wrote:
I just gave my 3 speed sturmey AG dynohub (internally an AW) a
service. I'd been having an intermittent clunking noise, maybe once a
ride, and I'd assumed it was the clutch slipping under load, hey ho
it's an old hub. So I opened it up, gave it a clean, replaced the
clutch and pawl springs, and put it back together. I took it for a
test ride and it's now clunking every half turn of the pedals, in all
3 positions and worsens under load. Before the clunk there is
noticeable resistance for a moment. Freewheels fine.

I'd love any thoughts. Most other posts I've read about noise are
grinding or just the pawls clicking. I'm stumped.

I'll be reopening the hub tonight to check I've reassembled correctly.
As this was the 3rd time I've serviced this hub, I wouldn't be
surprised if I'd got flippant.


Doesn't sound very 'Sturmey' in that a regular noise should not be
possible in all gears. I would look at pedals/cranks (crank pins?) crank
bearing for a 1/2 rotation noise first.

Any chance the sprocket is worn or bent? Have you changed the sprocket
or spacers or sprocket dust shell recently? A damaged chain noise should
have less frequency than 1/2 pedal rotation but sight it anyway for
links unlike the others- takes a second.

I like this article by Sheldon on diagnosing bike noises:
https://www.sheldonbrown.com/creaks.html


--
- Frank Krygowski