05-28-2013, 07:27 PM
Hi,
I have an ~12 year old Giant OCR1 with a 3 x 9 truvativ elite drivetrain that I picked up from craigslist. Recently, the bottom bracket started to creak, and when I went to investigate the situation, I found that the left (nondrive) side crank bolt was stripped. When I took it to the LBS, they gave it a shot, and then phoned me to pick it up: they couldn't get it unstuck and didn't have a solution for me.
The next best approach I could find online was to JB-weld an 8 mm allen to the bolt, and then use a breaker to remove it. Unfortunately, the JB weld did not hold under force.
Today, I bought a set of bolt extractors, and proceeded to attempt to conquer the problem with a more destructive approach. To make a long story short, I now have a set of trashed bolt extractors and a bike that still has a crankset stuck on it, except now there is an 8 mm whole drilled into the crank bolt (used to set a #5 bolt extractor unsuccessfully), so you can see straight through to the other side when the drive-side crank bolt is removed.
I'm not sure how to proceed next? does anyone have an idea? From some extensive searching, it appears possible that the person who assembled the bike could have used red loctite on this bolt since they have a slight tendency to back out with use?
I have resolved to purchasing a replacement crankset, but don't know enough about how these items come apart... can I take the drive crank arm off and then fish the stuck crank + spindle out the other side? or are the parts tapered such that they can only be removed from one side (e.g. spindle from the crank side)? Will I have to remove the bottom bracket on the drive side?
Thanks in advance!
Tim
I have an ~12 year old Giant OCR1 with a 3 x 9 truvativ elite drivetrain that I picked up from craigslist. Recently, the bottom bracket started to creak, and when I went to investigate the situation, I found that the left (nondrive) side crank bolt was stripped. When I took it to the LBS, they gave it a shot, and then phoned me to pick it up: they couldn't get it unstuck and didn't have a solution for me.
The next best approach I could find online was to JB-weld an 8 mm allen to the bolt, and then use a breaker to remove it. Unfortunately, the JB weld did not hold under force.
Today, I bought a set of bolt extractors, and proceeded to attempt to conquer the problem with a more destructive approach. To make a long story short, I now have a set of trashed bolt extractors and a bike that still has a crankset stuck on it, except now there is an 8 mm whole drilled into the crank bolt (used to set a #5 bolt extractor unsuccessfully), so you can see straight through to the other side when the drive-side crank bolt is removed.
I'm not sure how to proceed next? does anyone have an idea? From some extensive searching, it appears possible that the person who assembled the bike could have used red loctite on this bolt since they have a slight tendency to back out with use?
I have resolved to purchasing a replacement crankset, but don't know enough about how these items come apart... can I take the drive crank arm off and then fish the stuck crank + spindle out the other side? or are the parts tapered such that they can only be removed from one side (e.g. spindle from the crank side)? Will I have to remove the bottom bracket on the drive side?
Thanks in advance!
Tim