G250 breathes great no purge????

[tbone1004]

do you have an inline adjusting tool? If not, then it's slow trial and error.
Get the adjustment knob all the way out, and get the lever height flush with the top of the case. Put it on the first stage and if it doesn't freeflow, raise the lever. Do this slowly until there is a slight freeflow. If you can stop the freeflow with a full rotation of the adjustment knob, you can leave it there. If not, then lower the lever a bit. Once it starts freeflowing, we are talking quarter turn or less with adjustments

 

[guruboy]

....well if we're guessing.
Over engraved seat leading to excess orifice adjustment resulting in low lever height.

My vote as well.

 

[Couv]

I took everything apart and cleaned it all and replaced the o-rings.

Have you replaced the seat? If you've replaced all of the o-rings that means you removed the orifice. If you removed it with the poppet in place, then the seat was probably engraved.

I know others differ, but one step not mentioned in the video or in some of the materials is to depress the purge button ANYTIME you make an adjustment of the orifice. I know some think rotating the orifice is not harmful to the seat-some say it's helpful. Some say adjusting the orifice using an in line adjuster relieves the pressure off the soft seat enough so that the seat is not engraved. Most of the time that may be true, but for the little amount of effort it takes to press the purge button while adjusting the orifice, it's more than worth it and you can be sure you did not mess up a new seat.

Keep in mind that the lever height may change slightly as you adjust the orifice but what you are actually trying to adjust is the spring tension and cracking pressure. If you find you're adjusting orifice so much that the lever is dropping more than a very small amount, then something is wrong. Most likely the seat or the orifice is bad.

If you don't have an inline adjuster.....fear not. You can save a lot of trial and error by first installing the orifice all the way and back it out 1 1/2 to 1 3/4 turns. After you have the lever, poppet etc installed and are ready to start adjusting-but before you throw air to it, suck as hard as you can on the barrel inlet. Can you make a strong vacuum? If not, adjust the orifice in (remember to depress the purge) a quarter turn and try again. Repeat until successful. You'll be very close to the correct orifice position at that point and will only need to fine tune the rest.

BTW if the honking you hear on inhalation is coming from the second stage, you may have too much clearance between the lever and diaphragm......or you have one of the new fangled diaphragms.

 

[KeithG]

There is something here I do not understand (or is way different on my Sherwood regs)? Seems your problem is outside of the diaghram?

If it breathes okay, then that means the diaghram and lever adjustment are okay. When you inhale you pull the diaghram inwards which presses the lever which lifts the stem to open the valve. Things "inside" the diaghram appear to be working fine since it breathes properly.

The purge is simply a mechanical button that presses on the outside of the diaghram.

If it breathes okay i would not be looking at seat / lever adjustments. If it breathes okay but does not purge, i would be looking for something that is preventing the purge from pushing on the diaghram.

Is there something fundamentaly different between a Sherwood and a Scubaoro? Or is my understanding badly flawed?

 

[buddhasummer]

No offense to the OP but one of my friends thought his HOGs breathed really nicely, I thought otherwise. I put it on a gauge, the second was cracking at 1.8" with knob all the way out and he uses it screwed in. I thought it breathed terribly. I guess "breathing well" is subjective.

As has already been mentioned above if the purge button is functioning as it should then it's the lever, likely caused by worn seat or damaged orifice requiring the orifice to be screwed in too far to stop the leak dropping the lever too far. The spring could be worn but usually over time they get stiffer not softer. If you shake the second stage can you hear a rattle?

Good luck. Do keep us posted. Cheers.

 

[Couv]

Seems your problem is outside of the diaghram?

It could be, but the G250 has a pretty simple purge button assembly. I'm not familiar with the Sherwood.

 

[KeithG]

It could be, but the G250 has a pretty simple purge button assembly. I'm not familiar with the Sherwood.

If it breathes okay, how could it be a lever / orifice issue?

If the lever is adjusted wrong, then it will either free flow or not breathe. The lever is adjusted so that a slight inhale on the diagharm will deliver air.

 

[guruboy]

If the lever is adjusted wrong, then it will either free flow or not breathe. The lever is adjusted so that a slight inhale on the diagharm will deliver air.

Not exactly. With a worn seat, sometimes you will have to turn it in so much that the lever is almost all the way down.

I believe an earlier post by buddhasummer covered this already.

 

[KeithG]

Not exactly. With a worn seat, sometimes you will have to turn it in so much that the lever is almost all the way down.

I believe an earlier post by buddhasummer covered this already.

Mine will not breathe properly in this case. The diaghram is too far away from the lever. It will still purge just fine.

 

[guruboy]

Maybe your diaphragm is stiffer. The silicon ones can be sucked all the way down until it engages the lever.