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.


Not familiar with a dynohub but the last time I had a clunking noise every
half stroke it was the preload on the BB.