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 10-15-07, 03:45 AM   #1
Sammyboy
The Legitimiser
Thread Starter
 
Sammyboy's Avatar
 
Join Date: Jul 2005
Location: Southampton, UK
Bikes: Gazelle Trim Trophy, EG Bates Track Bike, HR Bates Cantiflex bike, Nigel Dean fixed gear conversion, Raleigh Royal, Falcon Westminster.
Posts: 4,847
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Using Heat on a Stuck Pedal

Ok, I did a thorough search, and just to cover off all the bases:

I have a stuck pedal, Campy pedals, Campy cranks. I've tried penetrating oil, impact, yes I'm using a pedal wrench, yes I know that the left hand pedal is left hand threaded. Today, I tried a propane torch on it, and had a little success. I let it sit for a couple of minutes, heating, then I found I was able to turn the pedal about 1/2 a turn, before it stuck again. I tried heating it some more, but no luck. What I'm wondering is this. I know that the aluminium heats faster than the steel, but at some point, the steel is going to catch up, and of course, once you stop heating the ali will cool faster than the steel, presumably restoring or even increasing the bond. Is there a way to determine the optimum time to free a pedal?
Sammyboy is offline   Reply With Quote
Old 10-15-07, 03:48 AM   #2
Bob Dopolina 
Mr. Dopolina
 
Bob Dopolina's Avatar
 
Join Date: May 2007
Location: Taiwan
Bikes: KUUPAS, Simpson VR
Posts: 9,967
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 10 Post(s)
Can't directly aswer your question (an interesting one) but might I suggest that once you get things good and hot you quick drench the whole mess in cold water. This may held break the pedal free.

Is it both pedals or just one?
Bob Dopolina is offline   Reply With Quote
Old 10-15-07, 03:52 AM   #3
Sammyboy
The Legitimiser
Thread Starter
 
Sammyboy's Avatar
 
Join Date: Jul 2005
Location: Southampton, UK
Bikes: Gazelle Trim Trophy, EG Bates Track Bike, HR Bates Cantiflex bike, Nigel Dean fixed gear conversion, Raleigh Royal, Falcon Westminster.
Posts: 4,847
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
It's just one. Won't a drench cool the aluminium faster? I'd have thought it would be counter-productive, but I can't think of anything to be lost trying it! I cannot ride on the quill pedals currently in place, so something must be done.....
Sammyboy is offline   Reply With Quote
Old 10-15-07, 05:03 AM   #4
Sammyboy
The Legitimiser
Thread Starter
 
Sammyboy's Avatar
 
Join Date: Jul 2005
Location: Southampton, UK
Bikes: Gazelle Trim Trophy, EG Bates Track Bike, HR Bates Cantiflex bike, Nigel Dean fixed gear conversion, Raleigh Royal, Falcon Westminster.
Posts: 4,847
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Bah. I heated it til it the crank discoloured, I doused it, nothing. I am frustrated.
Sammyboy is offline   Reply With Quote
Old 10-15-07, 05:49 PM   #5
Bob Dopolina 
Mr. Dopolina
 
Bob Dopolina's Avatar
 
Join Date: May 2007
Location: Taiwan
Bikes: KUUPAS, Simpson VR
Posts: 9,967
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 10 Post(s)
Wow. That's puppy's stuck. Someone out there must have a chemical solution. Good luck.
Bob Dopolina is offline   Reply With Quote
Old 10-15-07, 07:06 PM   #6
dafydd
JRA...
 
Join Date: Oct 2003
Location: philly
Bikes: trek 520 & 736, DeRosa Professional, Fuji Professional, Raleigh International 3-speed, Saronni (any info people?), Humber 3-speed, Raleigh Sports, Carlton Grand Prix coming soon!
Posts: 839
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
i've never tried the boiling water trick, but generally when the propane torch doesn't help, you can expect buggered threads when it the pedal comes out.
dafydd is offline   Reply With Quote
Old 10-15-07, 08:04 PM   #7
AndrewP
Senior Member
 
Join Date: Sep 2001
Location: Montreal
Bikes: Peugeot Hybrid, Minelli Hybrid
Posts: 6,521
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Ammonia is the release agent for stuck al-steel. Boiling water should provide enough heat, as al expands on heating much more than steel. Get a friend to pour boiling water over the end of the crank while you lean on the pedal wrench (put a pipe over the wrench to get more leverage).
AndrewP is offline   Reply With Quote
Old 10-15-07, 08:29 PM   #8
niknak
Senior Member
 
Join Date: May 2006
Location: San Jose, CA
Bikes:
Posts: 582
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Never met a stuck pedal I couldn't free with a cheater bar on the pedal wrench. Get a strong friend to apply force to the other crank arm as you pull.
niknak is offline   Reply With Quote
Old 10-15-07, 11:12 PM   #9
HDFACTORYCERTIF
Senior Member
 
Join Date: Jun 2007
Location: mountains
Bikes: Alex Singer+ cheap mountain bike
Posts: 117
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
The chemical solution I have is actually very natural. I learned this many years ago. Carefully heat the aluminum crank, then touch the threaded area with bees Wax.
Why Bees Wax? Bees Wax has a much higher flash point then any penetrating oil. It also will kill locktite and rust.
If this fails, then the pedal shaft needs to be heated to a dull red with a small brazing tip on an acetaline torch, then touch the Wax to it, of course this will trash the pedal axle but may save the crank.

Don
HDFACTORYCERTIF is offline   Reply With Quote
Old 10-16-07, 01:01 AM   #10
vsyucla
Junior Member
 
Join Date: Sep 2007
Bikes:
Posts: 6
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Try PB Blaster. Just use a liberal amount and let it soak.

If that doesn't work, then use an extension to the pedal wrench. To get the max torque you need to extend the length of the pedal wrench. The longer you extend the wrench, the more torque is applied to the bolt/nut. To do this, find a hollow metal tube that will fit over the pedal wrench. A good 2 foot metal tube should be more than enough. You can find this at a home depot.

You can also try heating will using the extension bar.
vsyucla is offline   Reply With Quote
Old 10-16-07, 07:24 AM   #11
McDave
Senior Member
 
Join Date: Jun 2006
Bikes:
Posts: 1,404
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by HDFACTORYCERTIF View Post
The chemical solution I have is actually very natural. I learned this many years ago. Carefully heat the aluminum crank, then touch the threaded area with bees Wax.
Why Bees Wax? Bees Wax has a much higher flash point then any penetrating oil. It also will kill locktite and rust.
If this fails, then the pedal shaft needs to be heated to a dull red with a small brazing tip on an acetaline torch, then touch the Wax to it, of course this will trash the pedal axle but may save the crank.

Don
Listen to this man people. He's not your average "bike" mechanic and knows his stuff where metal is concerned.

Sammy, once you get the axle to un-screw a bit you need to reverse direction and tighten it back up. This allows the penetrant, whether PB Blaster or LPS or Bees Wax to work into the threads. Just continue working it back and forth putting a bit more pressure on the wrench on the un-screw stroke. It will eventually come out but I'm afraid one stuck this bad will probably have some aluminum crank threads come out with it.
McDave is offline   Reply With Quote
Old 10-16-07, 07:34 AM   #12
tellyho
Your mom
 
Join Date: Aug 2006
Bikes:
Posts: 2,541
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Whenever you get it off, you're going to need a new crank - Al is not fond of being heated like that.
tellyho is offline   Reply With Quote
Old 10-16-07, 10:15 AM   #13
nick burns
Senior Member
 
nick burns's Avatar
 
Join Date: Oct 2004
Location: Absecon, NJ
Bikes: Puch Luzern, Puch Mistral SLE, Bianchi Pista, Motobecane Grand Touring, Austro-Daimler Ultima, Legnano, Raleigh MountainTour, Cannondale SM600
Posts: 2,943
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
You may want to try working with the crank off the bike. A cheater bar and the floor can sometimes convince a stuck pedal that it's time to come off.
nick burns is offline   Reply With Quote
Old 10-16-07, 12:08 PM   #14
Sammyboy
The Legitimiser
Thread Starter
 
Sammyboy's Avatar
 
Join Date: Jul 2005
Location: Southampton, UK
Bikes: Gazelle Trim Trophy, EG Bates Track Bike, HR Bates Cantiflex bike, Nigel Dean fixed gear conversion, Raleigh Royal, Falcon Westminster.
Posts: 4,847
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
If I need a new crank, I might as well give up on the job and just buy a new crank!
Sammyboy 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 11:30 PM.