Hi all,
Small background. Mk10 was working great, checked IP every month or so, one month I noticed it had a slow creep. This was after perhaps 18mo since the last service, perhaps 100 dives. Care was probably pretty average -- usually soaked after each dive, but a few times it got the 5min hose-down or worse.
So, I got a Mk10 kit and replaced the seat and all the orings provided in the kit (but none of the orings not provided, didn't think to buy those in advance). Gave everything a good teardown and clean in a sonicator with 50% vinegar, soft toothbrush for anything that looked a bit iffy (one of the shims looked to have iron rust on it) but mostly the ultrasonicator took care of almost everything. Was super careful with the piston the whole time -- didn't drop it, knife edge never touched anything other than water/vinegar mix.
Put it back together, with two shims was in the low 140s, but it was creeping still. Slower than before, perhaps 1psi/10s, but definitely creeping. I gave it about ten purges when I set it up before measuring to try to let stuff settle (is that enough?).
From what I can guess, it seems that creeping IP means damage in either the piston or the seat, which were the things I was super careful with. I spent some time dicking around with the stem oring, and I didn't replace some of the static orings, but I don't see how either of these could be related.
Could I have suffered piston damage while it was installed? From poor rinsing perhaps?
Cheers,
Andrew
Small background. Mk10 was working great, checked IP every month or so, one month I noticed it had a slow creep. This was after perhaps 18mo since the last service, perhaps 100 dives. Care was probably pretty average -- usually soaked after each dive, but a few times it got the 5min hose-down or worse.
So, I got a Mk10 kit and replaced the seat and all the orings provided in the kit (but none of the orings not provided, didn't think to buy those in advance). Gave everything a good teardown and clean in a sonicator with 50% vinegar, soft toothbrush for anything that looked a bit iffy (one of the shims looked to have iron rust on it) but mostly the ultrasonicator took care of almost everything. Was super careful with the piston the whole time -- didn't drop it, knife edge never touched anything other than water/vinegar mix.
Put it back together, with two shims was in the low 140s, but it was creeping still. Slower than before, perhaps 1psi/10s, but definitely creeping. I gave it about ten purges when I set it up before measuring to try to let stuff settle (is that enough?).
From what I can guess, it seems that creeping IP means damage in either the piston or the seat, which were the things I was super careful with. I spent some time dicking around with the stem oring, and I didn't replace some of the static orings, but I don't see how either of these could be related.
Could I have suffered piston damage while it was installed? From poor rinsing perhaps?
Cheers,
Andrew