Leak between loop and counterlung

stephenk · 10th February 2007, 19:04

I have a small stream of bubbles coming out between the hose and the inhale counterlung where the hose screws into the counterlung. I've cleaned the two o rings and where they fit into the counterlung and when this didn't work replaced the o rings, but still have the problem. It is a small leak and after an hours dive there is only a small amount of water in the inhale counterlung, less than I normally have in my exhale lung. I've had a good look at the leak in the bath and I can see exactly where the leak is, just don't seem to be able to stop it.

Any ideas of what to try next?

I don't have a spare hose but I guess this is the next thing to try. I had a few bubbles on my course so think I've had the problem on an off since I bought the unit. Anyone else had this problem?

Silent · 10th February 2007, 20:03

Hi Stephen,

If you've already changed the O'rings on the counterlung T fitting, the next thing I would check is the jubilee clips/clamps on the hoses.

I've had one that had loosened up slightly and produced a small bubble leak.

I would be surprised if the T fitting itself had a leak.

It could also be worth checking the inner sealing surface of the fitting on the counterlung for any damage, although I think that would be unlikely as well.

HTH

Neil

***Decodiver*** · 10th February 2007, 20:11

You need also to clean the inner fitting on the t-piece hole and remember to slowly engage the hose assembly into the hole before screwing down slowly.

If you are doing quickly or slightly lob-sided you may be dislodging one of the O-rings.

If you know a nother Meg user, borrow a lung for half an hour, set it up and give it a dunk, likewise, if that doesn't work use his loop, you should be able to identify the root of the problem.

Cheers,

Dave.

PS, Neil on the other thing we discussed, I will call you Monday about the books.

stephenk · 10th February 2007, 20:24

thanks for your responses. i already tightened the jubilee clips, I can see that the bubbles are coming from the hose connector rather than where the clips attach the hose. i'll try pushing the hose in slowly. i've cleaned the surfaces that are making the seal.

it is a very small leak btw, my positive pressure and negative checks are fine after 5 mins.

CharlieT · 11th February 2007, 11:16

Quote: (Originally Posted by stephenk)

I have a small stream of bubbles coming out between the hose and the inhale counterlung where the hose screws into the counterlung. I've cleaned the two o rings and where they fit into the counterlung and when this didn't work replaced the o rings, but still have the problem. It is a small leak and after an hours dive there is only a small amount of water in the inhale counterlung, less than I normally have in my exhale lung. I've had a good look at the leak in the bath and I can see exactly where the leak is, just don't seem to be able to stop it.

Any ideas of what to try next?

I don't have a spare hose but I guess this is the next thing to try. I had a few bubbles on my course so think I've had the problem on an off since I bought the unit. Anyone else had this problem?

What does your instructor suggest?

Charlie

PacketSniffer · 11th February 2007, 11:39

Quote: (Originally Posted by Silent)

<snip>If you've already changed the O'rings on the counterlung T fitting, the next thing I would check is the jubilee clips/clamps on the hoses.

This is a good suggestion and a word of caution for everyone receiving a new Meg. The hose clamps (jubilee clips) on the DSV side of the T fittings arrive loose so that the user can rotate the hoses to appropriately place the DSV at a comfortable angle for the diver.

stephenk · 11th February 2007, 11:44

Found the problem in what I thought was reasonably cunning way. I took off the threads for each T piece and swapped them over so i could screw the inhale hose t piece into the exhale counterlung and vice versa.

When i screw the inhale t piece into the exhale counterlung it still leaks, so it isn't related to the counterlung. To confirm I attached the exhale t piece that was working fine on the exhale counterlung into the inhale counterlung and this was fine so my counterlungs appear to be sound (in some ways a shame since would have been good excuse to get some neoprene ones). Also think this should rule out me fitting the t piece incorrectly into the counterlung since I've done this a number of times and only ever had the inhale T piece leak.

Thanks for your help everyone.

Charlie, haven't spoken to rich yet I'll try him tomorrow to see if he has a spare hose. I think it is hard for any instructor to compete with the combined knowledge of the rebreather world users, so I tend to come here first.

stephenk · 11th February 2007, 11:49

On the jubilee clip, if the leak is caused by the jubilee clip the leak should come from where the hose and the t piece meet. my leak is coming from between the t piece and the ring that screws it into the counterlung which I think can only come from where the t piece pushes into the counterlung. I've checked my leak in the sink so I'm sure of exactly where it is coming from.

When I wasn't sure where the leak was I did tighten the jubulee clips and one of them was looser than I'd have liked, so it is a good point to check regularly.

***jradomski*** · 11th February 2007, 18:25

Quote: (Originally Posted by stephenk)

I have a small stream of bubbles coming out between the hose and the inhale counterlung where the hose screws into the counterlung. I've cleaned the two o rings and where they fit into the counterlung and when this didn't work replaced the o rings, but still have the problem. It is a small leak and after an hours dive there is only a small amount of water in the inhale counterlung, less than I normally have in my exhale lung. I've had a good look at the leak in the bath and I can see exactly where the leak is, just don't seem to be able to stop it.

Any ideas of what to try next?

I don't have a spare hose but I guess this is the next thing to try. I had a few bubbles on my course so think I've had the problem on an off since I bought the unit. Anyone else had this problem?

Take of the o-rings from the t-piece and inspect for ridges.. I'm not sure if its still true, but the t-pieces from early last year required hand clean up of the t-pieces to remove the ridges left by the mold..

You can clean up the o-ring grooves with some sand paper if necessary..

stephenk · 11th February 2007, 23:12

Quote: (Originally Posted by jradomski)

Take of the o-rings from the t-piece and inspect for ridges.. I'm not sure if its still true, but the t-pieces from early last year required hand clean up of the t-pieces to remove the ridges left by the mold..

You can clean up the o-ring grooves with some sand paper if necessary..

thanks joe I'll give that a go. My meg is from about feb last year, so that could be the problem.

10th February 2007, 19:04	#1 (permalink)
stephenk New Member Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Feb 2006 Location: London Posts: 28	Leak between loop and counterlung I have a small stream of bubbles coming out between the hose and the inhale counterlung where the hose screws into the counterlung. I've cleaned the two o rings and where they fit into the counterlung and when this didn't work replaced the o rings, but still have the problem. It is a small leak and after an hours dive there is only a small amount of water in the inhale counterlung, less than I normally have in my exhale lung. I've had a good look at the leak in the bath and I can see exactly where the leak is, just don't seem to be able to stop it. Any ideas of what to try next? I don't have a spare hose but I guess this is the next thing to try. I had a few bubbles on my course so think I've had the problem on an off since I bought the unit. Anyone else had this problem?
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10th February 2007, 20:03	#2 (permalink)
Silent Staying Silent! Mostly... Current Rebreather/s: Other CCR Other Rebreather/s: Megalodon Ouroboros Other CCR Join Date: Jun 2005 Location: Northants, UK Posts: 383	Re: Leak between loop and counterlung Hi Stephen, If you've already changed the O'rings on the counterlung T fitting, the next thing I would check is the jubilee clips/clamps on the hoses. I've had one that had loosened up slightly and produced a small bubble leak. I would be surprised if the T fitting itself had a leak. It could also be worth checking the inner sealing surface of the fitting on the counterlung for any damage, although I think that would be unlikely as well. HTH Neil
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10th February 2007, 20:11	#3 (permalink)
*Decodiver* Administrator Current Rebreather/s: Other CCR Other Rebreather/s: Other CCR Join Date: Jan 2005 Location: Geneva Posts: 2,194	Re: Leak between loop and counterlung You need also to clean the inner fitting on the t-piece hole and remember to slowly engage the hose assembly into the hole before screwing down slowly. If you are doing quickly or slightly lob-sided you may be dislodging one of the O-rings. If you know a nother Meg user, borrow a lung for half an hour, set it up and give it a dunk, likewise, if that doesn't work use his loop, you should be able to identify the root of the problem. Cheers, Dave. PS, Neil on the other thing we discussed, I will call you Monday about the books. __________________ CCR/OC Trimix Instructor Trainer CCR Training to Mixed Gas in Switzerland, France, UK & Germany on Megalodon/COPIS-Megalodon/KISS/Sport KISS/Ouroboros/rEvo/Inspiration/Evolution/Sentinel www.zerogravitydiving.com Rebreather World Terms & Conditions
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10th February 2007, 20:24	#4 (permalink)
stephenk New Member Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Feb 2006 Location: London Posts: 28	Re: Leak between loop and counterlung thanks for your responses. i already tightened the jubilee clips, I can see that the bubbles are coming from the hose connector rather than where the clips attach the hose. i'll try pushing the hose in slowly. i've cleaned the surfaces that are making the seal. it is a very small leak btw, my positive pressure and negative checks are fine after 5 mins.
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11th February 2007, 11:16	#5 (permalink)
CharlieT Custom Title Allowed! Current Rebreather/s: Inspiration Vision Other Rebreather/s: Join Date: Nov 2005 Location: London Posts: 449	Re: Leak between loop and counterlung Quote: (Originally Posted by stephenk) I have a small stream of bubbles coming out between the hose and the inhale counterlung where the hose screws into the counterlung. I've cleaned the two o rings and where they fit into the counterlung and when this didn't work replaced the o rings, but still have the problem. It is a small leak and after an hours dive there is only a small amount of water in the inhale counterlung, less than I normally have in my exhale lung. I've had a good look at the leak in the bath and I can see exactly where the leak is, just don't seem to be able to stop it. Any ideas of what to try next? I don't have a spare hose but I guess this is the next thing to try. I had a few bubbles on my course so think I've had the problem on an off since I bought the unit. Anyone else had this problem? What does your instructor suggest? Charlie
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11th February 2007, 11:39	#6 (permalink)
PacketSniffer ~~~~~ #417 ~~~~~ Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Jun 2006 Location: Houston Posts: 437	Re: Leak between loop and counterlung Quote: (Originally Posted by Silent) <snip>If you've already changed the O'rings on the counterlung T fitting, the next thing I would check is the jubilee clips/clamps on the hoses. This is a good suggestion and a word of caution for everyone receiving a new Meg. The hose clamps (jubilee clips) on the DSV side of the T fittings arrive loose so that the user can rotate the hoses to appropriately place the DSV at a comfortable angle for the diver. __________________ Far better it is to dare mighty things, to win glorious triumphs, even though checked by failure, than to take rank with those poor spirits who neither enjoy much nor suffer much, because they live in the gray twilight that knows not victory or defeat.
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11th February 2007, 11:44	#7 (permalink)
stephenk New Member Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Feb 2006 Location: London Posts: 28	Re: Leak between loop and counterlung Found the problem in what I thought was reasonably cunning way. I took off the threads for each T piece and swapped them over so i could screw the inhale hose t piece into the exhale counterlung and vice versa. When i screw the inhale t piece into the exhale counterlung it still leaks, so it isn't related to the counterlung. To confirm I attached the exhale t piece that was working fine on the exhale counterlung into the inhale counterlung and this was fine so my counterlungs appear to be sound (in some ways a shame since would have been good excuse to get some neoprene ones). Also think this should rule out me fitting the t piece incorrectly into the counterlung since I've done this a number of times and only ever had the inhale T piece leak. Thanks for your help everyone. Charlie, haven't spoken to rich yet I'll try him tomorrow to see if he has a spare hose. I think it is hard for any instructor to compete with the combined knowledge of the rebreather world users, so I tend to come here first.
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11th February 2007, 11:49	#8 (permalink)
stephenk New Member Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Feb 2006 Location: London Posts: 28	Re: Leak between loop and counterlung On the jubilee clip, if the leak is caused by the jubilee clip the leak should come from where the hose and the t piece meet. my leak is coming from between the t piece and the ring that screws it into the counterlung which I think can only come from where the t piece pushes into the counterlung. I've checked my leak in the sink so I'm sure of exactly where it is coming from. When I wasn't sure where the leak was I did tighten the jubulee clips and one of them was looser than I'd have liked, so it is a good point to check regularly.
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11th February 2007, 18:25	#9 (permalink)
*jradomski* Moderator Current Rebreather/s: Inspiration Classic Sport Kiss Optima rEvo Other CCR Other Rebreather/s: Inspiration Vision Evolution Megalodon Classic Kiss rEvo Other CCR Join Date: Mar 2005 Location: "Da" Bronx Posts: 3,113	Re: Leak between loop and counterlung Quote: (Originally Posted by stephenk) I have a small stream of bubbles coming out between the hose and the inhale counterlung where the hose screws into the counterlung. I've cleaned the two o rings and where they fit into the counterlung and when this didn't work replaced the o rings, but still have the problem. It is a small leak and after an hours dive there is only a small amount of water in the inhale counterlung, less than I normally have in my exhale lung. I've had a good look at the leak in the bath and I can see exactly where the leak is, just don't seem to be able to stop it. Any ideas of what to try next? I don't have a spare hose but I guess this is the next thing to try. I had a few bubbles on my course so think I've had the problem on an off since I bought the unit. Anyone else had this problem? Take of the o-rings from the t-piece and inspect for ridges.. I'm not sure if its still true, but the t-pieces from early last year required hand clean up of the t-pieces to remove the ridges left by the mold.. You can clean up the o-ring grooves with some sand paper if necessary.. __________________ Joe Radomski CCR Trimix Instructor Trainer ANDI Instructor Trainer Director #10 All posts are personal opinions and DO NOT reflect any affiliated agency unless specifically stated.
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11th February 2007, 23:12	#10 (permalink)
stephenk New Member Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Feb 2006 Location: London Posts: 28	Re: Leak between loop and counterlung Quote: (Originally Posted by jradomski) Take of the o-rings from the t-piece and inspect for ridges.. I'm not sure if its still true, but the t-pieces from early last year required hand clean up of the t-pieces to remove the ridges left by the mold.. You can clean up the o-ring grooves with some sand paper if necessary.. thanks joe I'll give that a go. My meg is from about feb last year, so that could be the problem.
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