Seat and shims MK10 ?

[buddhasummer]

I left the MK10 pressurized overnight and noticed this morning a slight drop in psi, looks to be around 4psi. I've read here that this could be either a slight imperfection on the piston edge or seat or some foreign object, hair/dust. Is this anything to be concerned about? And/or should I pull it apart to investigate? Or is there a chance this might settle after a dive? I tried to expedite seating as per a post by Halocline by breathing/purging/leaving it pressurized overnight etc. It took a while to drop as after 3 hours, my last check before going to bed, ip hadn't changed. Thank you.

 

[buddhasummer]

When I purged it a few times it initially went back to the lower value but then suddenly, like a turbo, went quickly to the original reading, not sure if this is important information or not.

 

[redacted]

It takes quite a number of cycles to break a new seat in. I usually thinking terms of 50 to 100 cycles which can be done in just a few minutes by tapping the purge rapidly.

 

[buddhasummer]

I will try that, thank you.

 

[buddhasummer]

It takes quite a number of cycles to break a new seat in. I usually thinking terms of 50 to 100 cycles which can be done in just a few minutes by tapping the purge rapidly.

Would the seat settling account for a drop in ip?

 

[redacted]

Would the seat settling account for a drop in ip?

I think it can. I know IP will be erratic until the new seat is broken in. During break-in, it may go off a bit in either direction. I usually do not pay much attention to it until 2 or 3 minutes of very rapid cycling.

 

[halocline]

I wouldn't take it apart (you'll probably have some creep if you do) and I wouldn't worry about it. Just use it for a few dives and then see how stable it is. I've had them drop a few PSI while pressurized over several hours, it's nothing to be concerned about. It could be a tiny bit of air leaking out the 2nd stage, hose, ambient chamber. It means the HP seal is working right.

Due to the smaller piston size, MK10s seem to be a bit less stable than MK5s or MK15s in terms of IP. Big deal, they all work extremely well.

 

[buddhasummer]

Thank you Halocline. I've hooked it up to my D300s and will hopefully get a dive in on Sunday, pretty keen to see how they function in water as a set. The D300s seem stable, pretty sure I've got them as they should be.

 

[buddhasummer]

This is a problem with only a little knowledge (and being OCD), not sure when something is to be concerned about or ignored, thank god for SB and it's helpful gurus. I for one would never have been able to do, or even attempt, any of this without their help and guidance. I know I've said thanks before, but I'll say it again, thank you.

 

[halocline]

Thank you Halocline. I've hooked it up to my D300s and will hopefully get a dive in on Sunday, pretty keen to see how they function in water as a set. The D300s seem stable, pretty sure I've got them as they should be.

MK10/D300 is my primary cave set. I think you'll enjoy diving with it.