Reba fork losing air from + into - chamber

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stubs
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Reba fork losing air from + into - chamber

Postby stubs » Thu Jun 13, 2013 19:09 pm

Got a 2011 Reba Dual Air fork 120mm the one with the power bulges. It keeps losing air from the positive chamber which leaks into the negative chamber and pulls the fork down into the travel. I am assuming that one of the seals has gone on the Dual Air piston.

Thinking of stripping fork and getting the full Rockshox service kit from TfTuned anything else I need to look for when I strip the fork.
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supersonic
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Re: Reba fork losing air from + into - chamber

Postby supersonic » Thu Jun 13, 2013 22:53 pm

Examine the air shafts and make sure there are no scratches or dents. But apart from that, just a seal change. Some well priced kits on ebay.

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stubs
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Re: Reba fork losing air from + into - chamber

Postby stubs » Thu Jun 13, 2013 23:05 pm

Spotted the full service kit on ebay for £29

http://www.ebay.co.uk/itm/221239612116
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stubs
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Re: Reba fork losing air from + into - chamber

Postby stubs » Fri Jun 14, 2013 10:21 am

Think I have found the problem one of the seals on the Dual Air piston was twisted and not seated properly. It must have been like this since new. Think I got me a bargain took a punt and paid £30 for the forks thinking if I cant fix them they can be sold for spares, seal kit for £29 and I have a virtually new set of spare forks Happy Days :D
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stubs
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Re: Reba fork losing air from + into - chamber

Postby stubs » Mon Jun 17, 2013 09:19 am

All sorted now I found the problem this is the foam oil ring on the Negative piston it is an ex foam ring it is dead. Bits of it were all round the inside of the fork clogging up the seals. I cleaned everything out with IPA and an air line and lots of tiny bits of hard foam came out.

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P1020496 by fastmongrel, on Flickr
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cooldad
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Re: Reba fork losing air from + into - chamber

Postby cooldad » Mon Jun 17, 2013 09:24 am

A crusty ring is a terrible thing.
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benpinnick
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Re: Reba fork losing air from + into - chamber

Postby benpinnick » Mon Jun 17, 2013 09:58 am

Wow, nothing says 'we forgot to add some oil to the lowers like a crusty dried out o-ring!
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stubs
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Re: Reba fork losing air from + into - chamber

Postby stubs » Mon Jun 17, 2013 10:18 am

Plenty of oil in there I should know I had to clean it up when it missed the drip tray :lol:

It was most likely wrongly fitted all its supposed to do is keep the piston shaft lubed with oil from the oil bath at the bottom it doesnt do any sealing. I bet it was fitted twisted or was damaged before it was fitted probably a Friday afternoon special. Just waiting for the postie to deliver some 5wt oil for the damper and I will give it a test ride on the hardtail.
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