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I serviced by Fox 36 Debonair 150mm for the first time from new (It had previously gone back to Fox for a warranty part, they did a basic service lower leg service at the time). Dropped the lowers and the oil flowing out the air side was about right (honey colour and around 15ml), the oil coming out the dampner side was a white colour and seemed excessive. Looking at the charts this side should have around 5ml, but I would guess a good 30ml flowed out. Have I damaged the oil bath without realising ? or could the Fox technician have just overfilled it ?
Double check which fork you have 😉
A number of modern dampers are designed to ingest oil from the lowers. It means less seal friction and a damper that self bleeds. On these forks you would expect to see more oil and a lighter, different type from the spring leg.
A grip dampered 36 takes 40cc of "white" Teflon 4wt.
You can't buy the Teflon any more, do now you're going to have to move over to red 4wt unless you can find the 5wt anywhere.
Same thing happened to me.
https://singletrackmag.com/forum/bike-forum/fox-36-factory-service-disaster/
I don't think the same happened you you davros. Reading your post, you actively purged the 5wt from the damper then reassembled it mostly empty removing it's ability to self bleed. You need oil behind air to push the air out of the cartridge. You emptied that out.
Coconut, read the correct oil volume tables for your fork and put back the same amount/spec of fluid you lost, or fully purge and replace with 4wt.
Thanks - The fork is a 2021: Fox 36 Float Rhythm, 150mm, GRIP damper.
The Fox chart gives 5wt - 40cc in the dampener side, thanks all. I will top this up more.
So I need:
Damper side: 40cc of 5wt Teflon Oil (ordered Fox red 4wt)
Air Chamber underside: 10cc of 20wt Fox oil (injected in through the lower leg)
Upper Air Chamber: 3cc of 20wt Fox oil - I assume I remove the air filling valve from the crown and drip in 3cc into the air chamber from above ?
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Yes,
Air side upper, technically you should remove and add via the top cap, but adding via the schrader valve with the core removed would work, or you could add before installing the air spring if you remove it, which you must have done if you want to add it again.Â