MK10 Rebuild IP Question

[smorneau]

OK I got all my tools from scubatools and Vances book. I have torn down my mk10 (1st gen) and cleaned it in vinagar and lubed and put it back together using a kit from Vintage Double Hose.

I am wondering about my IP readings. With a tank pressure at 2200psi, I get 120psi at purge/breath and it recovers to 137psi quickly, after about 30 minutes it creaps down to about 132psi and hold there.

With tank pressure at 600psi I am getting a reading of 115psi at purge/breath with a quick recovery to 127psi and it creaps down to 125psi after about 30 minutes and holds.

There apears to be 3 shims/washers, two plastic/nylon washers one on either side of the spring and a very thin (see through) shim/washer that is against the bottom of the body.

The IP at low pressure concerns me. Any help would be great.

Thanks

 

[Fishpie]

Sounds good to me.
Nothing to worry about with the 2psi drop.
I wouldn't try to increase your IP especially for your colder water, 120 is plenty.

 

[elan]

I have most of my regs set at 130 some at 125. They breath harder a bit compared to my warm water AtX100 set at 140 but it works really well in our cold water.
A couple of my zeagles move down a bit (2-3 psi) after sitting for few hours

 

[smorneau]

I also have a question on torque. What should it be at the yoke nut and the bolt that holds the torrent on. Is there any torque requirements for the body and the seat cap?

Sent from my Nexus S using Tapatalk 2

 

[redacted]

Sounds about right for a Mk10 to me. I found Mk10s to experience more IP swing as a function of tank pressure than other Scubapro BP 1sts. I decided it is due to the smaller diameter of the piston head. I now use my Mk5s mostly.

Torque spec on the yoke retainer is 22 Ft lb (266 in lb). Older spec was 275 - 325 in lb.

Swivel retainer torque spec is 35 in lb.

No torque spec on the cap or the seat retainer. Just snug them up well.

 

[lowviz]

You did say 10, not 11.

Sorry, ignore this post...

 

[Zung]

Maybe it needs a bit of breaking-in. Did you purge it 20 times or more? 120-ish psi is normal for the Trident seat.

 

[halocline]

I'm not sure what exactly you're describing. Are you saying that when you purge the reg, it drops to 120 while the purge is pressed, then springs back to 137 when you release the purge, then settles at 135? That's not creep. Creep would be if it sprung back to say 135, then started slowly creeping up over the next few seconds or minutes. When you first pressurize the reg, what does the IP gauge read?

You can probably minimize the IP drop over the supply pressure by making sure that you have a 90 duro o-ring in the HP piston location, maybe try polyurethane, (that's a bit controversial....) and make sure it's well lubed with PTFE grease. Mine still drop 7-10 PSI from 3000 to 500. Them's the breaks.

I have noticed that with new seats, the IP will drift a bit, meaning every time it locks up it's a bit different. After a dive it should get more consistent.

 

[Couv]

.......

maybe try polyurethane, (that's a bit controversial....)...​

Controversial? Nothing is controversial in the DIY forum.