Question about Oceanic Delta 4 Dvt Regulator

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I recently bought this from dive show but can you please tell me what the switch is on top of reg

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It changes the amount of resistance needed for the air to be released, ie if you are diving at depth you may feel that you are having to work hard to breath, if you adjust the lever it will become easier. In converse as you come to the surface if the reg starts to free flow you can adjust the lever to stop it. Happy bubble blowing :)

Posted on Nov 10, 2010

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Please make it easy on yourself.....
If you go to Autozone,NAPA etc. most have diagrams on their computers that they can show you or run off for you. You could/should take a photo of the top front and bottom front of the engine to show as much as possible. Your 454 is the same as that used on Chevy trucks... so it is not something special!!

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I have a SR1 that had the breathing resistance knob on the 2nd stage fall off during a dive. Any clue where I can get a new one without sending the reg in for service?


Not likely a dive store or the manufacturer will sell such a part due to liability concerns. That being said, the knob should NOT fall out.
You could contact the place you bought it seeking warranty repair.
Ditto with the manufacturer. If you call Sherwood and describe the problem there's a good chance they will replace the part (in house) at no charge other then postage. However, most manufacturers require annual inspection/overhaul of life support equipment to maintain warranty status.

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If this engine is a VORTEC then you may have a problem with the internal fuel system. Under the top plenum there is a fuel reg and poppet valves that inject fuel into the cylinders. Sometimes the tubes that run fuel from the reg to the valves can leak and cause your problem. This cannot be found with pressure check because this occurrs after the reg. PS fuel mileage will go down. Let me know if this helps.Moe

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1 Answer

Mares Abyss Octo, brand new, not breathing well


It's possible that the perceived free flow problem is causing a more general lack of faith with the reg?
A correctly set up reg will never be too far away from free flowing in that transition from air to water - just as you dive in. This is not uncommon and shouldn't necessarily be determined to be a fault. Some manufacturers have gotten around this issue by allowing the user to switch the 2nd stage to a less sensitive setting (small knob on side 'pre-drive' & 'dive'). This means the reg can still be set up correctly but effectively put into an incorrect (for diving) mode while you are bobbing around on the surface getting ready to go down.
The fact that the abyss doesn't have this mode doesn't mean it isn't working right. If your shop adjust the sensitivity too far, they are going to make it harder to breath with. I have a couple of Abyss and sometimes experience small free flow. Nothing to worry about. You can look it up but the reg has been down to some record breaking depths without issue.
You haven't said which is your main reg - but the poseidon system runs a much higher pressure between 1st and second stage. You absolutely should not use this octo with poseidon, unless it has been ok'd by a authorized poseidon dealership.
In summary I can't see that your two problems are linked.

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