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 05-06-10, 11:13 AM   #1
Carbonfiberboy 
just another gosling
Thread Starter
 
Carbonfiberboy's Avatar
 
Join Date: Feb 2007
Location: Everett, WA
Bikes: CoMo Speedster 2003, Trek 5200, CAAD 9, Fred 2004
Posts: 11,106
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 51 Post(s)
Another stem won't come out thread

It's a Modolo Race aluminum quill stem in an aluminum frame with an aluminum steerer carbon fork. I need to replace the headset. I built the bike a few years ago and am sure I used anti-seize on it, but it's my rain bike. I knocked whatever the grabber thing is down fine - I don't remember if it was a wedge or a tapered plug. The stem doesn't move, though. I'm good with destroying the stem, but don't want to damage the fork or do something that will make the stem even harder to get out.
Carbonfiberboy is offline   Reply With Quote
Old 05-06-10, 11:22 AM   #2
HillRider 
Senior Member
 
Join Date: Aug 2005
Location: Pittsburgh, PA
Bikes: '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
Posts: 28,776
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 36 Post(s)
PB blaster or similar used copiously and prepare to wait for it to work. The usual recommendation of ammonia or oven cleaner won't work here because it would attack the aluminum steerer too.
HillRider is offline   Reply With Quote
Old 05-06-10, 11:38 AM   #3
Carbonfiberboy 
just another gosling
Thread Starter
 
Carbonfiberboy's Avatar
 
Join Date: Feb 2007
Location: Everett, WA
Bikes: CoMo Speedster 2003, Trek 5200, CAAD 9, Fred 2004
Posts: 11,106
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 51 Post(s)
Have Kroil, will begin chemical attack now. After a couple of weeks of Kroil, next step in attack?
Carbonfiberboy is offline   Reply With Quote
Old 05-06-10, 12:02 PM   #4
Chombi 
Senior Member
 
Chombi's Avatar
 
Join Date: Jul 2009
Bikes: 1986 Alan Record Carbonio, 1985 Vitus Plus Carbone 7, 1984 Peugeot PSV, 1972 Line Seeker, 1986(est.) Medici Aerodynamic (Project), 1985(est.) Peugeot PY10FC
Posts: 10,812
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 5 Post(s)
I suspect that the corrosion in your case might not be as bad as with dissimilar metals as with an aluminum stem in a steel steerer tube. I've encountered some steerer tubes in forks that taper to a smaller ID towards the bottom, specially if the fork crown and blades are a different material from the steerer, as it is needed for ovelapping and bonding the two different materials together. It may be that your stem is just jammed in this tapered area and mostly just needs a little physical "persuasion" to remove. Is there a way to tap on it from the bottm upwards with a metal rod without having the wedge inside get in the way?

Chombi
Chombi is offline   Reply With Quote
Old 05-06-10, 12:21 PM   #5
Carbonfiberboy 
just another gosling
Thread Starter
 
Carbonfiberboy's Avatar
 
Join Date: Feb 2007
Location: Everett, WA
Bikes: CoMo Speedster 2003, Trek 5200, CAAD 9, Fred 2004
Posts: 11,106
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 51 Post(s)
The fork has the normal little hole in what would be the bridge. If I remove the brake, I can get something in there, but the wedge or plug will still be in there.

In looking at this option, I've come to the conclusion that the wedge didn't drop after all or maybe doesn't drop now. If I tighten the stem bolt and pour Kroil into this hole, with the bike upside down, it does not come out the top. If I loosen the bolt, it does. Bike is presently upside down with Kroil in the steer tube.
Carbonfiberboy is offline   Reply With Quote
Old 05-06-10, 01:05 PM   #6
Chombi 
Senior Member
 
Chombi's Avatar
 
Join Date: Jul 2009
Bikes: 1986 Alan Record Carbonio, 1985 Vitus Plus Carbone 7, 1984 Peugeot PSV, 1972 Line Seeker, 1986(est.) Medici Aerodynamic (Project), 1985(est.) Peugeot PY10FC
Posts: 10,812
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 5 Post(s)
Quote:
Originally Posted by Carbonfiberboy View Post
The fork has the normal little hole in what would be the bridge. If I remove the brake, I can get something in there, but the wedge or plug will still be in there.

In looking at this option, I've come to the conclusion that the wedge didn't drop after all or maybe doesn't drop now. If I tighten the stem bolt and pour Kroil into this hole, with the bike upside down, it does not come out the top. If I loosen the bolt, it does. Bike is presently upside down with Kroil in the steer tube.
If the wedge bolt is long enough, you can usually loosen it to have the wedge hang down enough to develop space where you can sneak in a thin metal Rod to use to tap the stem out from below at the seam where the stem tube end meets the steerer tube. Just make sure that the rod is seated well on to the step where the tube meets before hitting it with a mallet or hammer. Be gentle and use good judgement on the intensity of your tapping on the rod to make sure you don't end up really bashing up the stem's edge and steerer tube's interior.

Chombi
Chombi is offline   Reply With Quote
Old 05-06-10, 03:26 PM   #7
Carbonfiberboy 
just another gosling
Thread Starter
 
Carbonfiberboy's Avatar
 
Join Date: Feb 2007
Location: Everett, WA
Bikes: CoMo Speedster 2003, Trek 5200, CAAD 9, Fred 2004
Posts: 11,106
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 51 Post(s)
I've attached a photo of the stem in question. Wedge takes up most of the bottom of the stem. Kroil has not yet begun dripping from the stem/headset joint, but I'll be patient.
Attached Images
File Type: jpg modolo_Qrace..jpg (97.2 KB, 23 views)
Carbonfiberboy is offline   Reply With Quote
Old 05-14-10, 10:16 PM   #8
Yellowbeard
Senior Member
 
Yellowbeard's Avatar
 
Join Date: Mar 2009
Location: Ontario
Bikes:
Posts: 833
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Get a vise around the top of the stem and twist the sucker out.
Yellowbeard 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 09:34 PM.