- Reaction score
- 13th floor of the Ivory Tower
- # of dives
- 1000 - 2499
I was about to start a new thread, but saw this one hence I am going to tell my story here.
A couple of dives ago I noticed a small leak from my Mk11 exactly from the same point (leaking diaphragm).
Compared to the one shown here mine is tiny - a couple of hair thin bubbles per second or so. Small but noticeable underwater.
Immediately after noticing the leak, I've ordered the kit to service it but it will take another couple of weeks before I get it. Since it is a pony reg and the leak is quite small I have decided to keep diving it (2 dives a week or so).
This reg was serviced by me in October 2018 and had about 150 dives as my primary reg till June 2020 when I changed it to pony reg. Between June and November 2020 it had about 30 dives as pony reg (fully charged during dives, a drill now and then but other than that not much action). Between November 2020 and April 2021 thanks to lock down I didn't dive. In September 2020 it passed a long leak and IP test (I leave it for 24+ hours pressurized but with valve closed and notice SPG and IP readings at the end). Post lock down before first use I did check it (couv's list - IP checks etc) but the leak was so small that I didn't notice it topside. So the leak probably started during the lock down or soon after it.
Scubapro gives a torque value (35Nm) for the diaphragm holder for Mk11 but I don't have a torque wrench (owning/servicing only 2 Mk11s is the excuse I give myself). The way I tightened it was to pass a long (about a foot - maybe longer) screwdriver through the holes of the holder and use the length of the screwdriver as a level to rotate it. The small vise I have at home was not strong enough to withstand the force I put to it so I had to use a bigger vice I have at work for this. I'd guess that would be pretty close to 35Nm if not (much) more. I will tell you in few weeks when I will be trying to unscrew it.
One thing I was thinking was to try to locate the leak by removing the spring and the diaphragm disk to look inside but I haven't bothered.
Hi @stepfen ,
I probably should not be butting into a "diaphragm first stage thread," but (here is where I butt in anyway) ensure the kit you install is a MK11 kit as the MK17 uses a different diaphragm (thinner) and 2 diaphragm washers as opposed to 1 found in the MK11.