Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 11-15-10, 09:46 AM   #1
ColonelJLloyd 
Senior Member
Thread Starter
 
ColonelJLloyd's Avatar
 
Join Date: Dec 2009
Location: Louisville
Bikes:
Posts: 8,211
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Replacing Bearings in Campagnolo Cartridge BB

I'm restoring a 1989 Bianchi Giro d'Italia. I removed the Campagnolo Athena BB and would like to replace the cartridge bearings.

The trouble is, I'm not sure how to go about it. I'm familiar with the IRD type in which the bearings can essentially be "pulled" off of the spindle after the cups are removed, but this looks different to me.

I read that this BB has two bearings on the drive side and one on the non-drive side. Any help is greatly appreciated.

I don't have a photo of the actual BB, but here is a photo from Velobase.

ColonelJLloyd is offline   Reply With Quote
Old 11-15-10, 10:36 AM   #2
fietsbob 
coprolite
 
fietsbob's Avatar
 
Join Date: Jun 2010
Location: NW,Oregon Coast
Bikes: 7
Posts: 18,789
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 214 Post(s)
Do you have access to an Arbor Press, its a Machine Shop standard tool.

not a hand tool.. big, & heavy but simple ... arch of heavy steel and a hydraulic jack
kind of force applicator.
fietsbob is online now   Reply With Quote
Old 11-15-10, 10:52 AM   #3
ColonelJLloyd 
Senior Member
Thread Starter
 
ColonelJLloyd's Avatar
 
Join Date: Dec 2009
Location: Louisville
Bikes:
Posts: 8,211
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Quote:
Originally Posted by fietsbob View Post
Do you have access to an Arbor Press, its a Machine Shop standard tool.

not a hand tool.. big, & heavy but simple ... arch of heavy steel and a hydraulic jack
kind of force applicator.
No. Is that what is needed to service this BB? Should I take it to a machine shop?

Once the old bearing units are off, will I need this tool again to install the replacements?
ColonelJLloyd is offline   Reply With Quote
Old 11-15-10, 10:58 AM   #4
canopus 
Senior Member
 
canopus's Avatar
 
Join Date: Mar 2009
Location: Kingwood, TX
Bikes: 1985 Cannondale SR300, 1985 Cannondale ST400, 1984 Trek 760, 1984 Trek 610, 1984 Trek 720, 1981 Trek 710, 1979 Trek 710, Gary Littlejohn Cruiser, BMX
Posts: 1,218
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Yes you will, assuming everything comes apart and nothing breaks. That is why they just replace these bottom brackets and not repair them. For the time and money involved its cheaper to replace it, or buy Phil Wood for easy bearing replacement in 10 to 20 years...
__________________
1984 Cannondale ST
1985 Cannondale SR300
1980 Gary Littlejohn Cruiser
1984 Trek 760
1981 Trek 710
Pics
canopus is offline   Reply With Quote
Old 11-15-10, 11:10 AM   #5
badamsjr
17yrold in 64yrold body
 
Join Date: May 2010
Location: Northern CA
Bikes:
Posts: 922
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I have replaced the bearings on a few Chorus and Record BB's with no problem. I chose to use ceramics, but G5 steel are available at very reasonable prices. On the Record and Chorus, there is a snap ring on the non-drive side that needs to be removed before pressing off the non-drive side 6903 bearing. then the center section comes right off, and the two 6803 bearings on the drive side can be pressed off. Reverse order to reassemble. On the ones I have renewed, it seems like the 6803 drive side bearings are the ones to go out first. I guess they take more stress on that side. I have access to a hydraulic press, and it works very well for this, and the only problem I have had was trying to install full ceramic 6803's--the races broke, so I went back to hybrid G5 ceramic. Good luck.
badamsjr is offline   Reply With Quote
Old 11-15-10, 11:35 AM   #6
ColonelJLloyd 
Senior Member
Thread Starter
 
ColonelJLloyd's Avatar
 
Join Date: Dec 2009
Location: Louisville
Bikes:
Posts: 8,211
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Quote:
Originally Posted by canopus View Post
Yes you will, assuming everything comes apart and nothing breaks. That is why they just replace these bottom brackets and not repair them. For the time and money involved its cheaper to replace it, or buy Phil Wood for easy bearing replacement in 10 to 20 years...
This article seems to indicate that the Campagnolo BBs are designed to be serviced. The bearings are relatively inexpensive, right? I don't expect my local machine shop to charge much remove and install the bearings. My LBS has sourced cartridge bearings from a local company.

Here's a thread I found that discusses this subject, but unfortunately it ends with the question I'm asking unanswered.

Badamsjr, can you tell me how to do it or what to tell the machine shop to do?

Last edited by ColonelJLloyd; 11-15-10 at 11:40 AM.
ColonelJLloyd is offline   Reply With Quote
Old 11-15-10, 11:54 AM   #7
badamsjr
17yrold in 64yrold body
 
Join Date: May 2010
Location: Northern CA
Bikes:
Posts: 922
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
As I said in my previous post, I have not done this to Athens BB, but on Chorus and Record, the only trick to watch out for is to remove the snap ring (after removing the left cup) from the non-drive side of the BB. Then you just need to figure out how to get a sturdy 'purchase' on the non-drive side 6903, and press the spindle out of the non-drive side 6903. The rest is pretty much self-explanatory. I usually wipe everything clean before I start reassembly, and put a thin coating of lube on the spindle to help with pressing the bearings back on. Hope this helps.
badamsjr is offline   Reply With Quote
Old 11-15-10, 11:56 AM   #8
zebede
Hello
 
zebede's Avatar
 
Join Date: Aug 2007
Location: Suncoast, Florida
Bikes: BF Tikit, Dahon Speed TR, Mezzo I4, Miyata 610, Gitane Criterium, Dahon Helios XL
Posts: 593
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
I am not familiar with your bottom bracket but have put quite a few cartridge bearings on electric motors and rebuilt gear boxes, I do not consider my self an expert.

1, You should only push on the inner race, (Unless you want to destructively remove the cartdige bearing in pieces).

If you don't have access to a press.

2. Get some metal tubing of the same diameter as the inner race and tap them on.

To aide installation:

-Clean spindle with emery cloth and then lube
-Put the spindle in freezer to shrink it slightly.
-You can warm t-he bearing in a oven to expand it slightly (keep below it's specified max operational temperature.
zebede is offline   Reply With Quote
Old 11-15-10, 12:04 PM   #9
ColonelJLloyd 
Senior Member
Thread Starter
 
ColonelJLloyd's Avatar
 
Join Date: Dec 2009
Location: Louisville
Bikes:
Posts: 8,211
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Thanks!
ColonelJLloyd is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -6. The time now is 10:24 AM.