i have found a fracture crack at the shock linkage pivot on the swing arm, is this a common fault, will it weld??

where are you located mate, if your not too far pop it round and ill do it for you

where are you located mate, if your not too far pop it round and ill do it for you

that would be great but iam in ayrshire, quite a distence form you, will it be ok if i get it alloy welded

Aslong as it's done properly it should be fine.

that would be great but iam in ayrshire, quite a distence form you, will it be ok if i get it alloy welded

yeah, just make sure they vee it out well and it will be fine mate

yeah, just make sure they vee it out well and it will be fine mate

yeah, well heres hoping, just bought bike and needs loads of parts.

Hi, I have a similar issue, 2000, Montesa Cota 315R, I have found a crack at one side of the swinging arm pivot point (where the long bolt goes through). The crack runs the length of the bush (aluminium surrounding the bearing). Can this be Veed out and welded? Or? :-(

yeah, just make sure they vee it out well and it will be fine mate http://www.trialscentral.com/forums/public/style_emoticons/#EMO_DIR#/thumbup.gif

Also find the end of the crack and drill a hole to stop it from traveling any further, the place that did the one on my Suzuki PE did this and that's been fine for years

Thanks, it's cracked across the full width of one side of the swing arm.

Photos of the crack.

Can anyone recommend a good welder/repair shop. I am Midlands based.

 

be

 

Thanks !

You should find plenty of welders in the midlands - search alloy welding, aluminium frame repairs, and similar phrases.

 

The reason it has cracked is probably because of bearing corrosion or corrosion between the outer bearing housing and the aluminium.

 

Before it is welded it needs the bearing removing and a solid steel form, with the same OD as the bearing pressing in. If it is welded without support it will shrink and IF you can get the new bearing in it will wear rapidly.

Sorry missed that part

Edited March 4, 201610 yr by hulmie

It has been welded, V cut and welded nearly all the way down, but not to the bottom, one end slightly damaged and built up, so I need to file down. I can feel the original fracture line lip inside, so may try to smooth that lip with a file. Internal diameter seems comparable to other side of arm (as measured with vernier). Will report back.

So assembled, and bearing is uncomfortably tight when inserting bush, bore is slightly out of true after weld repair. Question is how to get it back in true. Machine (how, milling?), file, sand with drill rotary sand attachment?

You could do it with a small hone and drill, the type they use on car wheel cylinders  

 

Aluminium isn’t the best material to hone but it should do it

 

The only problem you may have is the crack on the inside may act as a stress riser, and it will probably crack the weld (just keep an eye on it)

Edited March 12, 201610 yr by suzuki250