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 06-13-10, 04:20 AM   #1
lukeC
Senior Member
Thread Starter
 
Join Date: Feb 2007
Bikes:
Posts: 135
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Slightly Loose Cottered Crank Arm - Whats the easiest Remedy?

This old 70s or 80s Raliegh 3 speed I've recently bought has Cottered Cranks. After a 3-4 days of riding around town. the Left Crank has become a little loose.

You can just feel the play in the Crank as it swings over vertical. So what is the easiest / fastest Cheapest way to fix?


I"m in Central East London. should I just take it into a Cycle Shop? are they going to have the right equipment to fix?


Do I need to pull it out completely?
or can I just tighten it up with a wack of a hammer?
lukeC is offline   Reply With Quote
Old 06-13-10, 06:04 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: 28,847
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 66 Post(s)
Try driving the cotter in with a hammer but be sure to support the crank at the spindle end to avoid damaging the bottom bracket bearings. Tighten the fixing nut firmly once the cotter is reseated but don't try to reseat the cotter by just tightening the nut.
HillRider is offline   Reply With Quote
Old 06-13-10, 06:09 AM   #3
TurbineBlade
Kid A
 
TurbineBlade's Avatar
 
Join Date: Aug 2009
Location: Alexandria, VA
Bikes:
Posts: 1,778
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Whats the easiest Remedy?



Upgrade to a modern crankset honestly! No, I had a Raleigh 3-speed for a long time that I constantly battled on keeping the cotter pins tight. After I thought I had them tight once, it turns out that I had "bashed" them in too hard and the cranks were actually not completely 180 degrees from each other.

I rode my cottered cranks with absolutely NO confidence. I feared standing to pedal and eventually garaged the bike largely because of those damned pieces of crap.

Best way is just to get rid of them!
TurbineBlade is offline   Reply With Quote
Old 06-13-10, 06:22 AM   #4
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: 28,847
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 66 Post(s)
Quote:
Originally Posted by TurbineBlade View Post
Upgrade to a modern crankset honestly! Best way is just to get rid of them!
That may not be so easy if the bike has Raleigh's old style proprietary bb threading. If it's standard English threading I agree, upgrade to a new crank.
HillRider is offline   Reply With Quote
Old 06-13-10, 06:25 AM   #5
Dan Burkhart 
Senior member
 
Dan Burkhart's Avatar
 
Join Date: Oct 2004
Location: Oakville Ontario
Bikes:
Posts: 5,945
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 20 Post(s)
Quote:
Originally Posted by TurbineBlade View Post


Upgrade to a modern crankset honestly! No, I had a Raleigh 3-speed for a long time that I constantly battled on keeping the cotter pins tight. After I thought I had them tight once, it turns out that I had "bashed" them in too hard and the cranks were actually not completely 180 degrees from each other.

I rode my cottered cranks with absolutely NO confidence. I feared standing to pedal and eventually garaged the bike largely because of those damned pieces of crap.

Best way is just to get rid of them!
Were the cotters faced in opposite directions? If they are oriented with the nuts both pointed the same way, it will result in the cranks not being exactly 180 degrees.
Dan Burkhart is offline   Reply With Quote
Old 06-13-10, 06:40 AM   #6
TurbineBlade
Kid A
 
TurbineBlade's Avatar
 
Join Date: Aug 2009
Location: Alexandria, VA
Bikes:
Posts: 1,778
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Dan - Nah, I had them opposite -- I just applied so much force in driving them in that they deformed against the bb axle and were probably 1-2 degrees from 180. I tried installing new pins with a much lighter driving force, and after 20 miles they would be slightly loose (but enough to drive me nuts).

HillRider - exactly the problem with a lot of 3-speeds. Either drown a ton of $ in Phil Wood threaded bb's or garage it (like I did).
TurbineBlade is offline   Reply With Quote
Old 06-13-10, 07:31 AM   #7
JohnDThompson 
Old fart
 
JohnDThompson's Avatar
 
Join Date: Nov 2004
Location: Appleton WI
Bikes: Several, mostly not name brands.
Posts: 16,451
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 90 Post(s)
Most likely, the pin needs to be replaced. If it's been ridden to any extent while loose, the pin will suffer damage:



Remove the pin and inspect the angled face. If it has transverse grooves as pictured above, it needs to be replaced. Take the old pin in to your LBS to have them match it to a replacement; there are several diameters and angles available, but Raleighs in general will use a standard 9.5mm pin. Use a cotter press rather than a hammer to install the new pin if at all possible. And be sure to check the other side as well.
JohnDThompson 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 01:07 AM.