Armageddon Reg Orings

[Cyco-Dude]

This is definitely wrong, just got the orings in and they are too small.

larger would be too loose. 70 duro would stretch over easier. really, 90 can fit, you just need to make a tool to stretch the o-ring onto the shaft....like a cone, or something. these are probably all machine-installed. i said it would be a pain in the ass...

[luke]

I'm only referring to the 006 90D. Comparing the new to the old there's a visual difference in size.

You can even see it in the picture (Not running the black Buna)>


However, I just measured the shaft and the bore it fits in, and the 006 would be the correct fit with stretch and compression. I guess I'll stretch the piss out of it and install it. I'm just unsure how to explain the old oring unless it retained the stretch when it got old, originally I was thinking it might be a metric oring...

[Cyco-Dude]

I'm only referring to the 006 90D. Comparing the new to the old there's a visual difference in size.

yeah i know what you're talking about...it likely got stretched out. i seriously doubt air america would use a metric anything! 'MERICA!!11

but i was thinking of getting a small cone to help stretch the o-ring onto the shaft. i was looking at all of my pen tips to see if i could use those, but they were all too big. if you got a pencil, you can see the o-ring can stretch to 1/4" ID easy. imagine if it was made of polished ss, and lubed, it would be no problem. you can try other o-rings...yours might be old and hard. they are the same o-rings as the rtp on/off top / reg pin assy o-rings. you could boil them to make them softer too.

[luke]

I hate metric anything too (lol) but the good thing about metric orings are they give you in between sizes that come in handy in designing parts.

I already have an idea for installing these, making an install tool should be easy...

[Laku]

I hate metric anything too

Little off topic, sorry.

This is one thing that stumps me. I can't figure out what's not to love in the metric system. It makes the calculations so much easier. (This always reminds me of the episode in American Choppers where they try to figure out the correct measure in fractions of inch. )
I do understand that of course you get used to the system you're grown with.

[athomas]

I was caught in the middle of the metric change-over here in Canada years ago, so I still use both. I prefer the metric system because everything is base 10. It is so easy to take measurements and make minor adjustments.

I suspect the orings in the Air America products are indeed inch sized and not metric. These are the most common sizes off the shelf.

I would use 90 durometer orings in any high pressure regulator. The 70 will stretch to fit better, but the stretch also causes the orings to deform and get pushed out of place in high pressure situations. Unless you want to pick your orings out of any tiny crevises and vent holes in your regulator, stick with the stiffer orings.

[luke]

Got the orings installed.
I tapered a piece of 1/4" brass using a drill
soaked the orings in hot water for about a minute or so
installed orings on the brass piece
put in vice
oiled with silicon oil and slide into place on shaft.

[Cyco-Dude]

Got the orings installed.
I tapered a piece of 1/4" brass using a drill
soaked the orings in hot water for about a minute or so
installed orings on the brass piece
put in vice
oiled with silicon oil and slide into place on shaft.]

there you go; exactly how i would've done it!