45mm marzocchi's OC leaking oil from rebound adjuster

Recently my 01 cr125 decided to cover me in fork oil without me knowing. It was spurting out around the rebound adjustment screw while i was riding. I have pulled the forks down and removed the rebound needle as i guessed this was where the problem was (i thought the O ring would be split allowing oil up the damper rod).

Turns out the O ring is intact but a loose fit in the damper rod. I also noticed there was no spring to push the rebound needle back down as in other open chamber forks.

So three questions:

1: Would that O ring be what could be causing the oil to come out around the rebound adjuster?

2: What size is the O ring that goes on the rebound needle?

3: Should there be a spring pushing the rebound needle back down?

Appreciate any help.

Usually, the o ring goes bad or got dirt down in it.

I usually clean them with wd 40 then clean the areas they seal against with carb/parts cleaner. Then grease them/re assemble.

Always after washing bike kinda spray around them to flush water/dirt out with wd40.

Probably WE'RE or LTR will have an oring in stock for you.

Or you can measure it and order from online @ Oring Store. They give specs orings that are around oil etc....

For future reference i ended up using a metric O ring number 007. Rode the bike today no leaks.

Keep in mind that most hydraulic shops have a bulk metric o-ring kit and will sell you single o-rings for pennies. Cam.

Hello! Can you advise me how to remove copper washer from rebound valve, it locked by ring spring which rotates and i cant hook it.
Have same problem - leakage from foot.