Have questions or want to discuss cycling? Join Now or Sign In to participate in the BikeRide community.

New: Take part in the November Giveaway for a Single Speed Cruiser bike from Custom Villy


Lockring stuck on bracket Cup
#1
Hey,

I am trying to restore an old 1955 Triumph that I bought at a car boot sale. I was removing the bottom bracket today and have been having a problem removing the lock ring. I was using a hammer and punch to turn the lock ring (it was very stiff). Once it was loose I managed to remove it almost completely before it got stuck again. When I resumed using the hammer and punch I ended up just loosening the bracket cup which has now come free with the lock ring still attached.. I can get the cup back on but the lock ring doesn't go flush and I am concerned it will not be properly sealed.

Apologies if this isnt clear but I have attached a photo to make it clearer hopefully!

[Image: IMG-20141023-WA0001.jpeg]

Thanks,
Sam
  Reply
#2
You definitely need to get the lock ring moving so you can adjust the BB when you put it back together. You could try soaking the whole thing in a rust breaker like PB Blaster. If you can get the lockring moving back deeper onto the cup, you may be able to screw it all the way off to the inside instead. It may be that the outer threads are damaged rather than rusted and that is why it is binding.

Last resort could be to carefully cut the lockring with a hacksaw. You should be able to do this with minimal damage to the threads on the cup. Of course, you would need a new lock ring. But you should be able to find something that at least looks similar. (Unless this has some weird English threading?)

I'd be careful about clamping this in any way as your try to work it off, you don't want to crush the cup.

Have a shop chase the threads on the frame before you reassemble.

(This all assumes the cup itself isn't pitted on the inside. If it is, you either need to try to polish the bearing surface or make a decision about replacing it anyway.)
  Reply
#3
Hey,

Thanks for the quick reply. I will leave it soaking over night and see if that helps. I am concerned that it has slipped and so soaking wont help. It was slightly loose when I was trying to remove the pedal crank and I think it may have got bumped slightly :S

Time will tell.

Thanks again.
  Reply
#4
If soaking in solvent does not work, try Oxalic Acid; in the USA most automobile parts stores have, it is a rust remover. http://en.wikipedia.org/wiki/Oxalic_acid
Nigel
  Reply
#5
You might want to clean and inspect the cup to make sure it's good enough to reuse, lest you put in a lot of work for nothing. Of course if it is bad it will be a challenge finding a compatible cup, as the old English 3 speeds used different threading (26 tpi). You are essentially relegated to trying to scavenge some. Even back in the 70's the cups were hard to find.
  Reply


Possibly Related Threads...
Thread
Author
Replies
Views
Last Post
 
450
10-22-2020, 09:29 PM
Last Post: Mike L
 
7,077
05-19-2015, 08:48 AM
Last Post: alexwang32
 
18,180
02-20-2012, 10:46 PM
Last Post: ghost
 
11,230
10-04-2011, 03:36 AM
Last Post: GeorgeET
 
22,993
06-03-2011, 08:19 PM
Last Post: mrdunk

Forum Jump:

[-]
10 Latest Posts
Bike is Creaking on the left side during...
Today 07:36 PM
Finding out how old my shears bike is
Today 07:01 PM
New Zealand flag design with a cyclist
Today 06:51 PM
Newbie
Today 06:49 PM
Gears slipping
Today 02:10 AM
Bike recommendation
Yesterday 04:18 AM
Gravity Bike Crank
11-29-2020 07:08 PM
Biking in the rain
11-29-2020 04:57 PM
UCI Cyclo-cross World Cup
11-29-2020 04:33 PM
Brake pads and metallic pieces
11-29-2020 12:58 PM

[-]
Top 5 Posters This Month
no avatar 1. Jesper
48 posts
no avatar 2. Painkiller
19 posts
no avatar 3. Nikko
11 posts
no avatar 4. G_M
10 posts
no avatar 5. Sagan97
8 posts