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Author Topic: Pressed fittings?  (Read 6359 times)

spikebender

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Pressed fittings?
« on: December 10, 2015, 12:30:05 am »
Hello Group, have any of you had this problem in the passed. On my 855 the mount on the piece that is the rear of the triangle (up to the shock) has loosened. It seems to be pressed in Im not sure. I have no idea what the yellow stuff is around the joint maybe a sealant. It has been on there for 12 years I know of. SOOOOO can it be repaired. re welded, re pressed, epoxy, couple of rivets? Any input would be great.  Thanks, Tracy
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kiwi

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Re: Pressed fittings?
« Reply #1 on: December 10, 2015, 01:53:12 am »
that strut has been broken at some point and someone has tried to fix it with an epoxy.A good aluminium welder should be able to fix it.
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Spokes

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Re: Pressed fittings?
« Reply #2 on: December 10, 2015, 03:43:16 am »
It's my understanding that those joints were not welded from new. The top and bottom joints on the strut were a press fit and secured with an epoxy type resin. You always see a line where they join on all struts. I'm sure when Shovelon welded his strut to convert it to a modern shock fitting the heat melted the epoxy and loosens the top joints. From memory he welded them but I don't think there's any reason why you couldn't just re-epoxy it.

Chris
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spikebender

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Re: Pressed fittings?
« Reply #3 on: December 11, 2015, 12:40:05 am »
Right on. Thanks guys, epoxy it is. That I have, a Tig welder I dont.
                                                                  Thanks, Tracy
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kiwi

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Re: Pressed fittings?
« Reply #4 on: December 11, 2015, 02:04:28 am »
well i didnt know that,still learning about these bikes after all this time!
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Colin

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Re: Pressed fittings?
« Reply #5 on: December 11, 2015, 04:24:57 am »
Yes, epoxy or similar from new was my understanding, and heating the strut would cause the tubes to fire off like torpedoes from the internal air pressure apparently!

I'm actually considering doing this on an x57 (aiming at something soft and not living!) and replacing the tubes with very slightly longer ones to ensure adequate clearance for a 700c cyclocross wheel, tire and mudguard. So if anyone knows what gauge and type of Aluminium they're made from that would be great info!

Col.
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timber 2114

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Re: Pressed fittings?
« Reply #6 on: December 11, 2015, 10:36:46 am »
hi you could try aluminium brazing rods, the 300c see ones on ebay ,all you need is a blow torch heat it up than add the rod no flux needed (you can watch how to do it an you tube )cheers dave.
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kiwi

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Re: Pressed fittings?
« Reply #7 on: December 11, 2015, 02:06:36 pm »
well you could heat it gently and take the existing ones off and see what they are.May be a hot air gun would do the trick(for paint removal)
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spikebender

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Re: Pressed fittings?
« Reply #8 on: December 12, 2015, 12:15:26 am »
The one side should come off easy once i remove the bolt it has a little play I might mess with it this weekend. When I do remove it I'll check what gauge the tubing is and post it

                                                                             Tracy
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spikebender

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Re: Pressed fittings?
« Reply #9 on: January 02, 2016, 06:29:20 pm »
 Well I finally got around to repairing my 855. Once I removed the bolts and pulled the strut away the one piece almost fell off in my hand the other side had worked loose also, but it was a pain removing the other piece while not trying to booger it up. With that being said I found a crack in my chain stay (swing arm) right above the pivot bushing. It almost looks like an imperfection in the cast but after cleaning the grime off I can see a hairline crack  >:(  On the bright side I went for a ride and my epoxy repair seems to be OK. I had left my tools at work over the Holidays and was not able to check what gauge the tubing is, Sorry Colin   
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Spokes

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Re: Pressed fittings?
« Reply #10 on: January 04, 2016, 03:06:54 pm »
Yes the 855 swing arm were prone to cracking at that point so on the 856 they added a fillet to strengthen it. 856 swing arms don't crack.

Chris
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spikebender

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Re: Pressed fittings?
« Reply #11 on: January 04, 2016, 08:58:22 pm »
Will the swing arm off 856 fit an 855?
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Spokes

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Re: Pressed fittings?
« Reply #12 on: January 05, 2016, 02:00:52 pm »
Yes as far as I know. The 856 was basically a 855 with all the faults sorted. Only the strut top is different, everything else is interchangeable.

Chris
« Last Edit: January 05, 2016, 02:09:45 pm by Spokes »
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4000
857
856's
OZx modern build
757
4500
957
955
5000
no room in big shed but always room for one more!
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