Ohlins breakdown

[HenrikSchmidt]

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had this happen to my shock
does anyone of you know how much material it have from the bottom of the "fork" to where the rebound adjustment valve start?
Or does anyone have a exploted weiw of the rebound adjustment valve?
I'm thinking to repair this shock but don't know how the valve is working.

 

[mrkartoom]

Sorry no help to offer, but curious how did this happen?

 

[HenrikSchmidt]

Sorry no help to offer, but curious how did this happen?

Good question.. I would like to know that as well..
I checked and lubed the linkage when I got the bike about 3 months ago, the bearings was not new, but in good condition.

I have been riding some enduro practice, 1 enduro race and some mx tracks since I got the bike, around 30 hours total. and that tells me, It's not a sized bearing causing that, but the damper rod bearing is totally crushed now and the linkage arm looks like this..

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Off course when the shock rod breaks in one side, the bolt have free sideways play and the bearing is crushed within minutes on the track.

I think I can praise myself lucky for getting a flat rear tyre that day, don't even want to think what would happen if I kept riding and the other side, or the bolt also broke.
going in the air on a mx jump with the rear tyre suddenly hanging in the swingarm below the bike, is not something I would like to try

 

[iancp5]

Hmm hard to tell. Could be just a fault in the shock mount and the damage was done from the assymetric force after it had broken. When you fix it make sure the mount isn't clamping the linkage just in case.

 

[mrkartoom]

I saw a lower bolt snap after the linkage hole was already gouged out like that with lots of slop, but not seen the shock break. It would make sense if that was there first, but you said you inspected the bearings. Hard to say. Maybe a stress crack there before and just needed some proper pounding.

 

[HenrikSchmidt]

I was thinking, does all ohlins shock's all have a helicoil reinforced thread in the sub mount?

 

[iancp5]

I was thinking, does all ohlins shock's all have a helicoil reinforced thread in the sub mount?

Thought that was just damage but if it is a helicoil badly fitted it could account for the problem if it caused it to seize up on the linkage.

 

[elemetal]

I have seen this exact same failure point on 88-91 KTM's. The upper and lower shock pivot were not directly over eachother (off by 1/4" or so) but the lower pivot was only rotational (not like a Hiem joint). In MX or any other endeavor that would cause the rear to compress almost completely the lower shock mount would take a NASTY side load, leading to it's eventual failure. Fix was to use a lower bearing in the linkage that would allow for axial rotation as well as radial....delrin sleeves worked too.

This isn't a typical GG failure (not like the KTMs) but I'm guessing that some type of upper/lower mount mis-alignment lead to this shock failure. Ohlins USA is great for customer service, I'd send it to them (if in USA) in a heartbeat. Since you're on the other side of the pond I'll bet you could get great service from Ohlins direct....looks like you'll need another rocker and likely links as well.

Look at the swingarm bearings for radial play (allowing the swingarm to move side to side) or a bent mount where the links attach to the frame (causing skewed linkage movement). It'd be good to find the culprit and fix it before getting it back together.