OP
Rusty Shackleford
Contributor
This reg set is cursed. I said the other day I was overdue.
ScubaPro G-500
- Thread starter Rusty Shackleford
- Start date
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OP
Rusty Shackleford
Contributor
I pulled the MK-20. I can't find a problem. O-ring looks fine.
OP
Rusty Shackleford
Contributor
I looked again with my glasses. The O-Ring would have been fantastic if the tech hand't put the bottom bushing on up-side down.
You can see where the O-ring extruded over the bushing and there is a quasi-imprint on it. I can see the mold marks.
What was funny is when I pressurized it after the problem manifest, it took a couple seconds before the leak started. Took that long for the o-ring to creep. And the reg slightly hissed when I took it off the bottle, it was holding back a tiny bit of pressure on the HP side.
Creepy IP was a symptom of the problem. I knew it didn't look right when I was struggling with the G-500. I know good IP response when I see it. The needle on the gauge should snap to attention in a military manner. This was more inebriated.
What is ironic is if I hadn't left that bottle on all night with the leaky G-500 by mistake, it likely would have let go during a dive. I carry a 30cu/ft pony with a R-190/MK-2 as a bail-out when diving solo like today but still, this counts as my worst equipment failure.
I have the bench sheet from the shop with the date and the test results pre and post rebuild. Should I let the owner know?
Hell, I want my O-ring back!
PS THIS IS WHY YOU NEED TO PAY ATTENTION WHEN REBUILDING A MK-20/25. IF YOU HALF-ASS IT, IT WILL BITE YOU IN THE ASS!
Like , I said, you learn far more from your problem children than your successes.
You can see where the O-ring extruded over the bushing and there is a quasi-imprint on it. I can see the mold marks.
What was funny is when I pressurized it after the problem manifest, it took a couple seconds before the leak started. Took that long for the o-ring to creep. And the reg slightly hissed when I took it off the bottle, it was holding back a tiny bit of pressure on the HP side.
Creepy IP was a symptom of the problem. I knew it didn't look right when I was struggling with the G-500. I know good IP response when I see it. The needle on the gauge should snap to attention in a military manner. This was more inebriated.
What is ironic is if I hadn't left that bottle on all night with the leaky G-500 by mistake, it likely would have let go during a dive. I carry a 30cu/ft pony with a R-190/MK-2 as a bail-out when diving solo like today but still, this counts as my worst equipment failure.
I have the bench sheet from the shop with the date and the test results pre and post rebuild. Should I let the owner know?
Hell, I want my O-ring back!
PS THIS IS WHY YOU NEED TO PAY ATTENTION WHEN REBUILDING A MK-20/25. IF YOU HALF-ASS IT, IT WILL BITE YOU IN THE ASS!
Like , I said, you learn far more from your problem children than your successes.
Last edited:
OP
Rusty Shackleford
Contributor
Like , I said, you learn far more from your problem children than your successes.
I robbed an O-Ring out of an old MK-20 kit. I need to replace it.
I lubed and re-assembled it. It seems to be working ok. Ran out of time, will check the IP tomorrow.
Does anyone know the Mcmaster-Carr part number for that o-ring?
I robbed an O-Ring out of an old MK-20 kit. I need to replace it.
I lubed and re-assembled it. It seems to be working ok. Ran out of time, will check the IP tomorrow.
Does anyone know the Mcmaster-Carr part number for that o-ring?
What is the SP p/n?
That is an EPDM -010 duro 85 seal. McMaster does not have it; however they have a Viton -010 duro 90 seal McMaster-Carr
Scubagaskets
Contributor
You can find EPDM 010 at www.scubagaskets.com
In Duro 85-90??
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