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Right, 2 days back i took the lowers off my coiluturn lyriks to change the oil. When i did so I took out the coil from the top of the leg. I also pumped the other shaft up and down a few times (rebound and compression leg)
When i put the fork back together the 160mm marker was on view, this is not normal iirc.
All seemed good.
15 miles in to the ride yesterday I was hopping off some lumpson a grassy downhill, teh fork started clunking (topping out) quite harshly. This developed into a pogo stick like fork, no amount of fiddling with the rebound adjustor would slow it down.
Today i stripped the fork thinking i would find more oil in the lowers tahn i should have done, but it certainly did not look like that was the case.
The rebound side had approximately 30% of the oil below the rebound damper (in the upper leg) and the remaining 70% surrounding the Mission Control cartridge.
Cleaned an dinspected all aprts, greased seals, put the rebound unit back in and 115ml of 5wt oil. Then put the MICO back in.
Fork seems fine now after a 5 minute bump upand down in the woods.
Does this sound like a seal issue that i have momentarily fixed until the next big hit forces oil past said seal?
Also the rebound adjustor is stuck in the fork leg, so stuck in fact taht the red cap came off it when i tried to pull it out!! Any suggestions?
Cheers in advance!!
Any ideas lads n ladeez?
I've never had my Lyriks apart TBH, but this bit mystifies me:
The rebound side had approximately 30% of the oil below the rebound damper (in the upper leg) and the remaining 70% surrounding the Mission Control cartridge.
Surely the oil is either in the damping cartride or has leaked into the lower leg? Needs a bit more explanation! 🙂
oil is in a space where the damping cart fits. the rebound cartridge is also in that space
Right if you look at the link:
oil was below and above the part maked "14"
Between numbers 9 and 14
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Cruzheckler,
Ok, a bit of a yarn but it might help.
Item "14" is the rebound adjuster. The chamber that it sits in (Item 10)contains the main seal, this is normally the one that fails and empties all of the damping fluid into the lowers casuing "Hydraulic Lock". The rebound unit is approx 180mm long so it sits higher in the camber
This chamber is filled with damping fluid, the rebound adjuster (Which is just an adjustable one way valve made up of shims and holes) when moving through this oil causes resistance which controls the speed of spring return. If this failed then it would be due to oil starvation or blocked ports (Dirt etc).
The MICO depends on the 1 way valve of the rebound to force the same oil through its shim and holes which controls the speed of compression.
This means that even if the one way valve failed on the rebound the net effect would be that you would loose MICO not rebound.
[b]A bit of an assumption here.[/b]
If some (Not all) of the compression / rebound oil had passed from the top to the bottom (Due to seal failure)then air would be introduced into the damping / compression circuit giving the potential symptoms you describe. I suspect that if you had over filled the compression / rebound chamber this would cause high pressure (Due to it being a sealed system)at the bottom seal. This would compromise the capabilty of the seal and empty some oil into the lowers (Maybe not enough to notice but enough to introduce air).
Greasing of the bottom seal may be the issue, this seal will rely on the oil in the damping circuit for lubrication and shouldnt be greased.
Oh another thing, dont worry about the 160mm. You can with, a little pull extend the fork passed this mark and it will stay there until you compress the fork again.
The 160mm mark was visible all ride.not just if I pulled the lowers down. I think that (as the tech docs say) oil volume is critical, so even if a few ml had passed through the seal then the rebound would stop working. In real terms can you check if the compression damping is working just by pushing down on the bars or does it need to be checked in real ride situations?
A while back I was taking my lyriks apart for a service. On trying to remove the bolt at the bottom of the lowers on the spring side it would not undo/ kept turning, which I think twisted the spring. The result being the fork felt terrible, would not lower or get much travel and seemed to knock and top out all over the place. The answer was a new spring.
Cheers but thankfully not that
i think the oil should be 60mm from top iirc
its between 112 and 115ml according to tech docs
Older versions of the Lyric damper have less oil in than the newer version, cant rememeber exact figures though.
scruff the volume is correct
Spoke with Loco tuning (simon) this morning, full seal kit for the MICO/rebound side should sort it, along with fresh oil with some luck 🙂
Just need to now remove the rebound ajustor from the leg where it appears stuck solid!! Any tips?
Kit's on it's way 😀
I usually just lever the adjuster off with a flat screw driver to get it over the internal retaining ring.
mr plow - the red cap came off and the allen key is stuck
soak with penetrating oil (gt85/wd40) for a day or two and then grip an wiggle it
in the process now.
Re the main issue - i think the seal at the top of part 10 on teh diagram may be the issue. There was/is oil between that and the inside of the stanchion (below the seal) - this is not right is it?
either that or the 'seal head' seal at the bottom of part 10 seal
sorted the rebound adjustor - 2 nuts over the allen key - mole grips to hold them in place. Gentle leverage between the nuts - done 🙂
Jolly good 😀
Kit has arrived - somebitss wapped over, just looking at the spare parts 🙂
All sorted now, quick go in the woods and all seems good 🙂
Thanks again to simaon @ Loco tuning for great advice and service
Good result !
That there Simon at LoCo is becoming quite a legend !