what am i doing wrong?? jjbov leaks and free flows

Al Marvelli · 20th June 2009, 01:09

ok i got the jj bov for my revo micro. set it up and flew off to sunny florida. i didnt adjust anything out the box and it seemed to work ok in the garage.

anyways dropping in on the spiegel grove and it free flows at about 30fsw, i disconnected the qc < a cejn hose to the dil side> and keep going. post dive I use an allen key to back out the poppet, seems ok on surface, lever height looked ok. second dive, water and no gas on oc. ugh. pop the top and lookie here the diaphgram is cut in two spots!!! it looks like the lever arm cut the diaphgram which then rotated 180 degress and the lever cut it again!

so i get another diaphgram, undo the set screw take it out look at it- nothing obvious jumps out- re assemble and readjust, re dive and one dive goes ok. then after 1 hr si it freeflows at about 25fsw. i disconnect and resign to dive it as a dsv only for the rest of the trip-two weeks-, which the dsv part worked fine btw.

so the question is this what am i doing wrong?

**kevin stone** · 20th June 2009, 02:28

Are you using a wrench to tighten the Lp hose?
If you do the inside will spin.

Al Marvelli · 20th June 2009, 03:35

no i had seen mark chase's note about that so i was using a finger tight fitting from golem to a swivel to an ocean reef cejn fitting. when i re assembled the hose fitting the second time i held the lever in place with my finger while attaching the fitting.

i am thinking the swivel is causing enuff torque to turn the arm assembly which would cut the diapgram. but why no gas??

DS · 20th June 2009, 11:38

Hey Marv,

You need to come to the shop so's I can do your offboard anyhow, so bring the thing and we can figure it out here.

Dave

.

Scubascooby · 20th June 2009, 18:48

It doesn't sound good that the diaphragm can be cut by the lever.

I've read about not tightening the hose with a spanner but why is the lever able to rotate ?

Mark Chase · 20th June 2009, 21:37

Quote: (Originally Posted by Scubascooby)

It doesn't sound good that the diaphragm can be cut by the lever.

I've read about not tightening the hose with a spanner but why is the lever able to rotate ?

Theres no keying flat on the barrell so its just the friction of the grub screw that holds it in place.

Not a big deel so long as you know about it.

My one is put on finger tight and bearley niped up by hand at that.

ATB

Mark

deepwrecksc · 20th June 2009, 22:20

Quote: (Originally Posted by kybrt)

no i had seen mark chase's note about that so i was using a finger tight fitting from golem to a swivel to an ocean reef cejn fitting. when i re assembled the hose fitting the second time i held the lever in place with my finger while attaching the fitting.

i am thinking the swivel is causing enuff torque to turn the arm assembly which would cut the diapgram. but why no gas??

I have the exact same setup and you are spot-on. There is just enough torque on the hose that instead of swiveling, it either works the fingertight fitting loose on the spool or rotates the entire spool against the grub screw. I've gotten in the habit of checking this (grub screw tightness and lever position) every time before I jump in the water but it is unsettling to climb back on the boat and find that the omniswivel has worked loose 3 or four turns on the spool!

This could be solved with a flat machined on the outside of the spool (as has been suggested by Mark Chase earlier) but also potentially by a sharp-point grub screw that would "dig" into the spool enough to keep it from rotating.

As far as I'm concerned, the JJ-BOV is an excellent piece of equipment, but we need to figure out a solution to this particular problem.

Lee

Scubascooby · 21st June 2009, 13:46

I had a look at the JJ a few months ago but having a BOV that you can't rely on seems like a liability I can live without.

Finger tight fittings always work loose. Even ones that are nipped up too gently with a spanner work loose, I recently had one that needed 4-5 turns to tighten it!

dave t · 21st June 2009, 14:14

A regulator hose is a piston seal it doesnt rely on the tighness of the nut to make the seal, the nut just stops the piston o-ring pulling out.

the solenoid hose connection on an inspo is always done up finger tight and that never comes undone nor does the ADV connection which is also finger tight, in fact the hoses are designed so you cant put a spanner on them.

I may be wrong but I think the OP who had his diaphram split was due to the fact that he unplugged the bov underwater. the OC side of any bov is a sealed chamber and relies on the gas connection to to equalise pressure in the OC chamber while the bov is in ccr mode, you cannot dive with the gas switched off or unplugged.

my apologies if I am wrong and you didnt unplug it underwater

Al Marvelli · 22nd June 2009, 00:43

yeah i did unplug uw, the pressure against the diaphgram i didnt think of but it
does fit.

20th June 2009, 01:09	#1 (permalink)
Al Marvelli RBW Member rEvoMicro w.hybrid&dsix stand rEvoII fullsize Join Date: Jan 2007 Location: Neuw Yawk Posts: 944	what am i doing wrong?? jjbov leaks and free flows ok i got the jj bov for my revo micro. set it up and flew off to sunny florida. i didnt adjust anything out the box and it seemed to work ok in the garage. anyways dropping in on the spiegel grove and it free flows at about 30fsw, i disconnected the qc < a cejn hose to the dil side> and keep going. post dive I use an allen key to back out the poppet, seems ok on surface, lever height looked ok. second dive, water and no gas on oc. ugh. pop the top and lookie here the diaphgram is cut in two spots!!! it looks like the lever arm cut the diaphgram which then rotated 180 degress and the lever cut it again! so i get another diaphgram, undo the set screw take it out look at it- nothing obvious jumps out- re assemble and readjust, re dive and one dive goes ok. then after 1 hr si it freeflows at about 25fsw. i disconnect and resign to dive it as a dsv only for the rest of the trip-two weeks-, which the dsv part worked fine btw. so the question is this what am i doing wrong? __________________ Marv fidelis Ad Mortem
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20th June 2009, 02:28	#2 (permalink)
kevin stone Supporting Member Classic Kiss Hammerhead Sport Kiss Hammerhead Join Date: Jun 2005 Location: us ct. Posts: 649	Re: what am i doing wrong?? jjbov leaks and free flows Are you using a wrench to tighten the Lp hose? If you do the inside will spin.
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20th June 2009, 03:35	#3 (permalink)
Al Marvelli RBW Member rEvoMicro w.hybrid&dsix stand rEvoII fullsize Join Date: Jan 2007 Location: Neuw Yawk Posts: 944	Re: what am i doing wrong?? jjbov leaks and free flows no i had seen mark chase's note about that so i was using a finger tight fitting from golem to a swivel to an ocean reef cejn fitting. when i re assembled the hose fitting the second time i held the lever in place with my finger while attaching the fitting. i am thinking the swivel is causing enuff torque to turn the arm assembly which would cut the diapgram. but why no gas?? __________________ Marv fidelis Ad Mortem
(Offline)

20th June 2009, 11:38	#4 (permalink)
DS Banned Join Date: Jun 2006 Posts: 0	Re: what am i doing wrong?? jjbov leaks and free flows Hey Marv, You need to come to the shop so's I can do your offboard anyhow, so bring the thing and we can figure it out here. Dave .
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20th June 2009, 18:48	#5 (permalink)
Scubascooby Choose Freedom - UKIP Join Date: Nov 2005 Location: Great Britain Posts: 677	Re: what am i doing wrong?? jjbov leaks and free flows It doesn't sound good that the diaphragm can be cut by the lever. I've read about not tightening the hose with a spanner but why is the lever able to rotate ?
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20th June 2009, 21:37	#6 (permalink)
Mark Chase So many CCR So little etc JJ Hybrid Inspo, Hammer Head, KISS rEvo Join Date: Jan 2005 Location: Kent Posts: 4,362	Re: what am i doing wrong?? jjbov leaks and free flows Quote: (Originally Posted by Scubascooby) It doesn't sound good that the diaphragm can be cut by the lever. I've read about not tightening the hose with a spanner but why is the lever able to rotate ? Theres no keying flat on the barrell so its just the friction of the grub screw that holds it in place. Not a big deel so long as you know about it. My one is put on finger tight and bearley niped up by hand at that. ATB Mark __________________ See my "Doing It Chasey" video where I'm locked into a padded room, naked, with two ball bearings and within an Hour, I manage to lose one and break the other!!! Kevin Juergensen 16/11/08 [/QUOTE]
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20th June 2009, 22:20	#7 (permalink)
deepwrecksc Blinded with science... MK15.5 MK15 Join Date: Mar 2007 Location: Chapel Hill, NC Posts: 184	Re: what am i doing wrong?? jjbov leaks and free flows Quote: (Originally Posted by kybrt) no i had seen mark chase's note about that so i was using a finger tight fitting from golem to a swivel to an ocean reef cejn fitting. when i re assembled the hose fitting the second time i held the lever in place with my finger while attaching the fitting. i am thinking the swivel is causing enuff torque to turn the arm assembly which would cut the diapgram. but why no gas?? I have the exact same setup and you are spot-on. There is just enough torque on the hose that instead of swiveling, it either works the fingertight fitting loose on the spool or rotates the entire spool against the grub screw. I've gotten in the habit of checking this (grub screw tightness and lever position) every time before I jump in the water but it is unsettling to climb back on the boat and find that the omniswivel has worked loose 3 or four turns on the spool! This could be solved with a flat machined on the outside of the spool (as has been suggested by Mark Chase earlier) but also potentially by a sharp-point grub screw that would "dig" into the spool enough to keep it from rotating. As far as I'm concerned, the JJ-BOV is an excellent piece of equipment, but we need to figure out a solution to this particular problem. Lee
(Offline)

21st June 2009, 13:46	#8 (permalink)
Scubascooby Choose Freedom - UKIP Join Date: Nov 2005 Location: Great Britain Posts: 677	Re: what am i doing wrong?? jjbov leaks and free flows I had a look at the JJ a few months ago but having a BOV that you can't rely on seems like a liability I can live without. Finger tight fittings always work loose. Even ones that are nipped up too gently with a spanner work loose, I recently had one that needed 4-5 turns to tighten it!
(Offline)

21st June 2009, 14:14	#9 (permalink)
dave t RBW Member Join Date: May 2005 Location: UK Posts: 932	Re: what am i doing wrong?? jjbov leaks and free flows A regulator hose is a piston seal it doesnt rely on the tighness of the nut to make the seal, the nut just stops the piston o-ring pulling out. the solenoid hose connection on an inspo is always done up finger tight and that never comes undone nor does the ADV connection which is also finger tight, in fact the hoses are designed so you cant put a spanner on them. I may be wrong but I think the OP who had his diaphram split was due to the fact that he unplugged the bov underwater. the OC side of any bov is a sealed chamber and relies on the gas connection to to equalise pressure in the OC chamber while the bov is in ccr mode, you cannot dive with the gas switched off or unplugged. my apologies if I am wrong and you didnt unplug it underwater
(Offline)

22nd June 2009, 00:43	#10 (permalink)
Al Marvelli RBW Member rEvoMicro w.hybrid&dsix stand rEvoII fullsize Join Date: Jan 2007 Location: Neuw Yawk Posts: 944	Re: what am i doing wrong?? jjbov leaks and free flows yeah i did unplug uw, the pressure against the diaphgram i didnt think of but it does fit. __________________ Marv fidelis Ad Mortem
(Offline)

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