Scubapro G250 can't be serviced??

[Centrals]

This is going to turn something like car modification! No ending!
Keep going and have fun.

Hobby is priceless.

 

[Couv]

There is nothing wrong with using a shim on the spring/balance chamber.

 

[rsingler]

Even with the longer BC with IP135 both my G250V crack at .7, .8” can’t tune them to 1” without a spring shim.

But if you can get 0.7", just turn the knob in a turn. Or, like @couv said, throw in a shim.

If 0.7" is the max you can get, well, that's a problem.

 

[buddhasummer]

Yes I have, maybe I just need to find that magical spring. I disorder checked calibration on my mag.

Make sure you're looking right but that your tongue is on the left side of your mouth, I've had good success doing this.

I often end up with .8" especially on converted G250s, in water no issue. Interestingly I often struggle to get lower than 1.1" on G250Vs, depends how much wiggle room I want it to have, can get down to .9-1" if I'm patient.

 

[buddhasummer]

But if you can get 0.7", just turn the knob in a turn. Or, like @couv said, throw in a shim.

If 0.7" is the max you can get, well, that's a problem.

I encounterd this super low cracking .6-.7" after using some damaged orifices which I tried to tidy up using a lathe, which only flattened out edge and increased seat surface contact. It was a fail.

 

[buddhasummer]

My point, is orifice unmolested?

 

[Open Ocean Diver]

But if you can get 0.7", just turn the knob in a turn. Or, like @couv said, throw in a shim.

If 0.7" is the max you can get, well, that's a problem.

If I turn the knob in yes I can get over 1.5, I just wanted to see factory spec with knob out and no shim, like yours. Unless your testing with a lowering IP. With the shim I’m at 1 with knob all the way out.

 

[buddhasummer]

There is nothing wrong with using a shim on the spring/balance chamber.

Where can I get these "shims" ? I'm interested in having a play.

 

[Open Ocean Diver]

Where can I get these "shims" ? I'm interested in having a play.

I got them from Rob, I believe the ones I have are spring pads from a G500.

 

[Open Ocean Diver]

My point, is orifice unmolested?

They are the original orifices when I purchased the regulators, they look to be in good condition, unmolested. Maybe I’ll swap one for a new orifice I have a few. I figured since they seal with such light spring pressure the orifice would be fine.