Powered by Outside

Failed "Rebuild" of Fox Float RP3 DRCV rear shock,,, need help!

PB Forum :: Mechanics' Lounge
Failed "Rebuild" of Fox Float RP3 DRCV rear shock,,, need help!

 Post Message | Latest Comment
Author Message
flag funperro
Posted: Jul 5, 2020 at 21:46 Quote
My rear shock (Fox Float RP3 DRCV) completely stopped holding air. So I purchased the Fox Factory Rebuild Kit (part 803-00-142). After watching numerous videos, I went to work and started the rebuild. I was very meticulous, making sure to follow the suggestions in the video. I ended up replacing the "seal sandwich" in the can as well as on the piston, plus the wiper seal, for a total of 7 seals replaced. I then put the shock back on the bike and pumped it up. I was pleased to see it was apparently holding air (pumped it to 200 psi). I got on the bike and noticed it was making a "squishy" sound whenever the shock was compressed or expanded. After a quick ride around the neighborhood, I could see that the sag had increased.. and after measuring, noticed pressure had decreased. The shock was not fully holding pressure (although it was holding it better than before I did the rebuild).

Ok, so I filled it up again with air. I used some soapy water and determined the air leak was occurring where the schrader valve stem enters into the shock body.... right between the stem and body. I was able to take the internal valve out of the schrader stem, then was able to remove the stem from the shock. There is some o-ring material that appears to be extruded out. See pic. The schrader valve hole is the one I'm talking about and can be seen in the pic in roughly the lower left section of photo... it is the "shinier" threaded hole. When zooming in, see the o ring material on the top side of the hole? Any idea what this may be? I was hoping the fix would be to replace the 2 orings on the schrader stem, but this doesnt seem to be the case based on this oring material that is partially pushed out. Any ideas on how to replace this piece?

photo

Thanks!
flag el-booto
Posted: Jul 5, 2020 at 22:31 Quote
that piece of o-ring material is from a pair of rings that seal the DRCV chamber from the primary chamber. see the silver material inside the aircan? that's a separate piece of aluminium that's sealed to the black body, one of the rings has been rolled either during service or in the factory from new

you can unseat it and replace the two o-rings on there and that leak will go away.
flag funperro
Posted: Jul 6, 2020 at 8:45 Quote
el-booto wrote:
that piece of o-ring material is from a pair of rings that seal the DRCV chamber from the primary chamber. see the silver material inside the aircan? that's a separate piece of aluminium that's sealed to the black body, one of the rings has been rolled either during service or in the factory from new

you can unseat it and replace the two o-rings on there and that leak will go away.

Thanks for the response that is quite helpful! So I'm assuming the separate piece of aluminum you are referring to is the same thing as the "puck" or "disc",right? I've read a bunch of threads on other sites, and thats what some folks are referring to it as. Just wanted to make sure I completely understood your response.

Next question: how do I determine what o rings to use? Is there a part # list somewhere?

Thanks!
flag el-booto
Posted: Jul 6, 2020 at 12:45 Quote
funperro wrote:
el-booto wrote:
that piece of o-ring material is from a pair of rings that seal the DRCV chamber from the primary chamber. see the silver material inside the aircan? that's a separate piece of aluminium that's sealed to the black body, one of the rings has been rolled either during service or in the factory from new

you can unseat it and replace the two o-rings on there and that leak will go away.

Thanks for the response that is quite helpful! So I'm assuming the separate piece of aluminum you are referring to is the same thing as the "puck" or "disc",right? I've read a bunch of threads on other sites, and thats what some folks are referring to it as. Just wanted to make sure I completely understood your response.

Next question: how do I determine what o rings to use? Is there a part # list somewhere?

Thanks!
yes that's correct
if you have a set of callipers, easiest way is to measure the inner diameter of the O-ring grooves on the "puck" and the section diameter, and grab some from your local hydraulics supplier.
flag funperro
Posted: Jul 6, 2020 at 20:29 Quote
el-booto wrote:
funperro wrote:
el-booto wrote:
that piece of o-ring material is from a pair of rings that seal the DRCV chamber from the primary chamber. see the silver material inside the aircan? that's a separate piece of aluminium that's sealed to the black body, one of the rings has been rolled either during service or in the factory from new

you can unseat it and replace the two o-rings on there and that leak will go away.

Thanks for the response that is quite helpful! So I'm assuming the separate piece of aluminum you are referring to is the same thing as the "puck" or "disc",right? I've read a bunch of threads on other sites, and thats what some folks are referring to it as. Just wanted to make sure I completely understood your response.

Next question: how do I determine what o rings to use? Is there a part # list somewhere?

Thanks!
yes that's correct
if you have a set of callipers, easiest way is to measure the inner diameter of the O-ring grooves on the "puck" and the section diameter, and grab some from your local hydraulics supplier.

Awesome those are great suggestions, I'll do that. In other news, I got after it today and was able to get the puck pushed out... and can feel some damage on the upper o ring. I'm feeling pretty confident that this should solve the mystery of my shock that no longer holds air!

photo
  • Previous Page
  • Next Page

 


Copyright © 2000 - 2026. Pinkbike.com. All rights reserved.
dv65 0.014261
Mobile Version of Website