Author Topic: Oh no...the bottom bracket (Read 5938 times)

Thunderchild · « **on:** September 27, 2009, 11:20:43 pm »

Recently, I thought my chain line was moving lateral a bit when I would crank on my Oz. With the Oz in the work stand, I tried pushing the crank in and pulling away from the bike. Sure enough a little extra play.

I removed the cranks and inspected the BB shell. The drive side of the BB shell has separated from the body a tad

. I think it just started raining outside too; surely not a harbinger...

Now that you have all gone and checked your Ozzies, anyone ever have this problem and know if this is fixable? A job for epoxy man? The non drive side looks intact. How would I remove the shell??? I have been riding my Oz since 2003 and she has 11300+ miles on her. She is too young to mount above the fire place!!

Thunderchild

rapiddescent · « **Reply #1 on:** September 28, 2009, 09:49:31 am »

mine is exactly the same - it made an ear-wretching squeel as I pedalled in the SingleSpeed UK champs this year - so much so that riders were letting me past and letting me get ahead a bit !!

of course, in singlespeed - one puts a massive torque through the BB. Although, as an aside I had been jumping the bike pissed the night before and had also ridden across a dance floor...

I haven't looked at it in detail to see how to fix it. so any ideas welcome. I can actually see a gap between the BB shell and the frame.

shovelon · « **Reply #2 on:** September 28, 2009, 12:39:23 pm »

I had that happen too. I creaked like rusty door hinge every time I pedaled on the drive side. Turned out the epoxy broke loose from the threaded pivot face insert. I ended up JBwelding it back in.

See if you can unthread it some more after taking off the swingarm. I think it was spokes that had pictures of his frame without the inserts, and the threads were colored red. That is when I agreed to take a look at mine and dicovered the loose insert

Terry

shovelon · « **Reply #3 on:** September 28, 2009, 12:43:22 pm »

Quote from: rapiddescent on September 28, 2009, 09:49:31 am

made an ear-wretching squeel as I pedalled in the SingleSpeed UK champs this year - so much so that riders were letting me past and letting me get ahead a bit !!

Thunderchild · « **Reply #4 on:** September 28, 2009, 09:52:17 pm »

Quote from: shovelon on September 28, 2009, 12:39:23 pm

I had that happen too. I creaked like rusty door hinge every time I pedaled on the drive side. Turned out the epoxy broke loose from the threaded pivot face insert. I ended up JBwelding it back in.

See if you can unthread it some more after taking off the swingarm. I think it was spokes that had pictures of his frame without the inserts, and the threads were colored red. That is when I agreed to take a look at mine and dicovered the loose insert

Terry

Terry are you just talking about the swingarm pivot or are you saying the BB shell is threaded into the frame? I am thinking that I have to get the BB shell out in order to try and use epoxy to secure it back into the frame. Maybe I could try and force the JB weld into the BB-frame separation with a flexible flat blade... Any other ideas...anyone?

Thunderchild

shovelon · « **Reply #5 on:** September 29, 2009, 08:17:02 am »

It is not the pivot, but the pivot face insert holder that threads into the BB shell. There should be 2 spanner holes in it.

shovelon · « **Reply #6 on:** September 29, 2009, 08:20:59 am »

Skoddy was the one with the problems.

See here.
http://idriders.com/proflex/smf/index.php?topic=2905.0

Spokes · « **Reply #7 on:** October 01, 2009, 02:18:06 pm »

No it wasnt me with the problem, thankfully!

Chris

Thunderchild · « **Reply #8 on:** October 02, 2009, 11:17:23 am »

The separation between the bottom bracket shell and the frame body is so small that I am not sure I can push enough epoxy into it to make a difference. Anyone remember if that old list member who split his Oz frame a few years ago, to make a mold or something, revealed how the bottom bracket shell is secured in the frame? Could it be a sleeve in a sleeve like the seatpost tube?

Thunderchild

shovelon · « **Reply #9 on:** October 02, 2009, 01:24:14 pm »

Quote from: Thunderchild on October 02, 2009, 11:17:23 am

The separation between the bottom bracket shell and the frame body is so small that I am not sure I can push enough epoxy into it to make a difference. Anyone remember if that old list member who split his Oz frame a few years ago, to make a mold or something, revealed how the bottom bracket shell is secured in the frame? Could it be a sleeve in a sleeve like the seatpost tube?

Thunderchild

That would be Dominic.

If you unscrew the part out, lather it up with goo, you can rethread it in and it should be tight.

Thunderchild · « **Reply #10 on:** October 02, 2009, 04:42:06 pm »

Quote from: shovelon on October 02, 2009, 01:24:14 pm

If you unscrew the part out, lather it up with goo, you can rethread it in and it should be tight.

As in your pictures, you are talking about the swing arm pivot. I am talking about the bottom bracket shell. I don't think it is threaded on its outside and screwed into the frame. I will post a picture soon.

Thunderchild

shovelon · « **Reply #11 on:** October 02, 2009, 05:25:35 pm »

Quote from: Thunderchild on October 02, 2009, 04:42:06 pm

Quote from: shovelon on October 02, 2009, 01:24:14 pm
If you unscrew the part out, lather it up with goo, you can rethread it in and it should be tight.

As in your pictures, you are talking about the swing arm pivot. I am talking about the bottom bracket shell. I don't think it is threaded on its outside and screwed into the frame. I will post a picture soon.

Thunderchild

Doh! Right you are.

Luke · « **Reply #12 on:** October 05, 2009, 12:58:13 am »

Haha! funnily enough I was about to post something about a surprising gain in BB rigidity.
My BB shell started really drifting around recently, I was convinced I'd have to get a new frame.
Then I thought what the hell! If it's dead I've nothing to lose.
The play was so bad you could see the gap moving when pushing the cranks side to side by hand.
So off came the drive side crank, I put the bike on its side and working the left crank to "flex" the play, I poured in about half a tube of good old fashioned SUPER GLUE.
It was the only glue that I could think of that was runny enough for such a small gap, and it penetrated brilliantly.

Now that was last week and I've only done about 300km on it since then but it feels like a whole new bike.
Amazing stiffness down at the cranks (well, for a 5500 anyway)
So yes, super glue runny, NOT the gel.

Happy gluing, just watch your fingers, I have a perfect thumbprint glued next to the BB now
L

Now I have to find the dicky cell in my battery pack, my NR Blowtorch went out at full tilt down a really exciting singletrack last noght...

Colin · « **Reply #13 on:** October 05, 2009, 06:59:49 am »

Quote from: Thunderchild on October 02, 2009, 11:17:23 am

The separation between the bottom bracket shell and the frame body is so small that I am not sure I can push enough epoxy into it to make a difference. Anyone remember if that old list member who split his Oz frame a few years ago, to make a mold or something, revealed how the bottom bracket shell is secured in the frame? Could it be a sleeve in a sleeve like the seatpost tube?

Thunderchild

Here's a diagram of the carbon frame guts!

http://idriders.com/proflex/resources/carbon_tech_sheet.pdf

Col.

rapiddescent · « **Reply #14 on:** October 05, 2009, 07:13:45 am »

I'm going to try this on my Oz and see if I can get it back on the road. Will let you know the results.

callum
rds

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Author Topic: Oh no...the bottom bracket (Read 5938 times)