Retrobike Forum Index

It is currently Sat Dec 10, 2016 8:06 am

* Login   * Register * Search  * FAQ



Post new topic Reply to topic  [ 26 posts ]  Go to page 1, 2, 3  Next
Author Message
 Post subject: Headset keeps loosening
PostPosted: Wed Jun 26, 2013 8:40 pm 
Devout Dirtbag
User avatar

Joined: Wed Dec 05, 2012 9:18 am
Posts: 131
Location: Bangor - NI
Hi,

the headset on my dynatech keeps loosening. I have tightened the lower nut, and then tightened the upper nut onto the lower nut, but both keep loosening when out on the bike. I keep having to tighten both by hand intermittently during a ride. Its become second nature now but I'd rather sort it out.

(I'm referring to the 2 nuts that thread on to the steerer)

This evening I tightened the lower nut until the headset bearings almost felt crunchy and then tightened the upper nut as much as I thought was sensible with a big wrench, but it still happened after 3 miles.

Any ideas????

N


Top
 Profile  
 
PostPosted: Wed Jun 26, 2013 9:57 pm 
Retro Guru
User avatar

Joined: Wed Apr 25, 2012 2:08 pm
Posts: 2186
Location: Shrewsbury
That's a bit of a strange one.

It could be worth checking the cups in the headtube are tight, if they are loose its possible they could work the locknut loose.

Do you have loose bearings or caged? Worth a check if they are caged that they both face outwards from the headtube, although even if they are the wrong way around it would be unusual to loosen the locknut.

Sometimes there's a keyed spacer between the top cone and the locknut. That allows the locknut to tighten without adding pressure to the cone, I'm not sure whether a dynatech has one or not but could also be worth a check.

You also don't want the cones to tight, they should just touch the bearings. A good check is to apply the front brake and push down on the forks rocking backwards and forwards. If there's no play and the forks turn smoothly then the adjustment is right.


Top
 Profile  
 
PostPosted: Wed Jun 26, 2013 10:04 pm 
rBoTM Winner
rBoTM Winner
User avatar

Joined: Wed Dec 12, 2012 10:18 pm
Posts: 2373
Location: California
nathanm26 wrote:
as much as I thought was sensible



That is a tough one to figure out sometimes. I had the same problem with my Colnago for a while but was able to get it sorted out.

If I had to guess it would be that you are not putting enough torque on the top nut.


Top
 Profile  
 
PostPosted: Wed Jun 26, 2013 10:13 pm 
Old School Grand Master
User avatar

Joined: Fri Oct 14, 2011 8:41 pm
Posts: 8247
Location: Cumbria
Is there a spacer between the two? If there isn't there can be trouble.....

http://i41.tinypic.com/4er6o.jpg

Shaun


Top
 Profile  
 
PostPosted: Wed Jun 26, 2013 10:17 pm 
Retro Guru
User avatar

Joined: Sat Feb 12, 2011 6:39 pm
Posts: 1182
Location: wales
sounds like your bearings are worn/damaged. use a biro to feel the faces of the head set cups for any defects and replace the bearings. caged bearings are an enathema, slightly worn and they start screwing the facings imho


Top
 Profile  
 
PostPosted: Wed Jun 26, 2013 10:49 pm 
Retro Guru

Joined: Sun Aug 22, 2010 7:07 pm
Posts: 1324
Location: Cotswolds
My experience is somewhat older, but we always used 2 spanners and tightened one against the other. The tabbed or flatted washer does help.


Top
 Profile  
 
PostPosted: Thu Jun 27, 2013 6:51 am 
Retro Guru
User avatar

Joined: Sun Jan 06, 2013 9:51 pm
Posts: 277
Location: AL5, Herts, UK
Worth checking you have the correct size balls in the top race (guess how I know).


Top
 Profile  
 
PostPosted: Thu Jun 27, 2013 8:09 am 
Devout Dirtbag
User avatar

Joined: Wed Dec 05, 2012 9:18 am
Posts: 131
Location: Bangor - NI
Hi all, and thanks for the replies.

Yes bearings are caged. I do the rocking test when it's tightened Robbied, and when it loosens out on the road you can imagine what it feels like!
Yes Shaun I think I recall a spacer between the two when I was putting the headset back together but will double check. I think I will do a bit of examining this evening (will also take a look at the headset cups as you suggest joe), take a few pictures and report back. As Keith and Lewis suggest, maybe to do with not being tight enough, but I certainly felt like I couldn't have taken it much tighter.

N


Top
 Profile  
 
PostPosted: Thu Jun 27, 2013 9:38 am 
Retro Guru
User avatar

Joined: Thu Jun 23, 2011 11:25 pm
Posts: 1787
Location: It's not easy being a dolphin.
keithglos wrote:
My experience is somewhat older, but we always used 2 spanners and tightened one against the other. The tabbed or flatted washer does help.


This. I had the same problem once. Check that the threads are good to begin with and not worn, and try cleaning off any excess grease from the top lock-nut too.


Top
 Profile  
 
PostPosted: Thu Jun 27, 2013 9:42 am 
Old School Grand Master

Joined: Tue Oct 09, 2007 1:55 pm
Posts: 8222
Location: New Forest, UK
A better way to tighten:
1 Do up bottom nut .
2 Tighten down top nut
3 Holding the top nut with the spanner, loosen the bottom with a second spanner - this tightens the two against each other. I reckon an inch or two of movement of the bottom spanner end in my hand usually (so around 1/8 to 1/16 of a turn).


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 26 posts ]  Go to page 1, 2, 3  Next

All times are UTC [ DST ]


Who is online

Users browsing this forum: mr_gumby and 30 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  

About Us

Follow Retrobike

Other cool stuff

All content © 2005-2015 Retrobike unless otherwise stated.
Cookies Policy.
bikedeals - the best bike deals in one place
FatCOGS - Fat Chance Owner's Group

Powered by phpBB® Forum Software © phpBB Group