Farallon SPG overhaul...

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Discussion of diving methods and equipment available prior to the development of BCDs beyond the horse collar. This forum is dedicated to the pre-1970 diving.
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Fibonacci
Lung Diver
 
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Location: Melbourne, Australia

Farallon SPG overhaul...

Fri Nov 18, 2016 6:30 pm

I have a vintage 1970's Farallon SPG (in psi) that I originally started diving with... while it still seems to work perfectly the o-rings are old now and I'd like to restore it as part of a classic DH set up.

It uses an early integral form of SPG spigot, but takes the usual o-ring... no problems there.

However the flanged connector uses two o-rings one in compression at the end, and the other around the shaft of the connector.

Anyone familiar with these old gauges and know what size o-rings to get?

Not sure whether these were just rebranded gauges made in Italy or they really were made in USA... and so Metric or Imperial o-ring sizes.

Also the HP hose is 3/8" UNF vs modern HP hoses which are 7/16" UNF.
I could just use an adaptor but I'd like to keep it looking original... however cannot find a source of HP 3/8" UNF hoses or HP 90 Duro o-rings to suit, most are 70 Duro.

Image

Any advice gratefully received :)

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Bryan
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Location: Wesley Chapel Florida

Re: Farallon SPG overhaul...

Fri Nov 18, 2016 7:33 pm

Fibonacci wrote:Anyone familiar with these old gauges and know what size o-rings to get?

Not sure whether these were just rebranded gauges made in Italy or they really were made in USA... and so Metric or Imperial o-ring sizes.

Trident has an O-ring chart that downloads as a PDF and you can size them from there. I'll bet they are standard imperial size.

Also the HP hose is 3/8" UNF vs modern HP hoses which are 7/16" UNF.
I could just use an adaptor but I'd like to keep it looking original... however cannot find a source of HP 3/8" UNF hoses or HP 90 Duro o-rings to suit, most are 70 Duro.

I have been selling 3/8" HP hoses in the website store for 8 years now. .

Image

Any advice gratefully received :)
Doing it right should include some common sense, not just blindly following specs and instructions. .Gary D, AWAP on SB

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Fibonacci
Lung Diver
 
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Location: Melbourne, Australia

Re: Farallon SPG overhaul...

Fri Nov 18, 2016 10:11 pm

Aha... right under my nose :oops:
http://vintagedoublehose.com/store/#!/H ... ry=8331915

Trident chart here:
http://www.tridentdive.com/achart.pdf

O-rings appear to be R013 for the barrel and R012 for the end

Thanks Bryan!

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couv
Master Diver
 
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Re: Farallon SPG overhaul...

Mon Nov 21, 2016 6:33 pm

I am interested to know if that gauge has a blow out plug. I had a Farallon SPG very similar to that one blow the face plate out zinging past my favorite ear. Later, I looked at the back and found no blow out plug and have been wondering if it was designed that way or if it was just an oddball manufacturing defect.

I believe I have some duro 90 -003 o-rings; send me your snail mail address and I get some out to you.

Here is my o-ring "size matters" cut and paste info:

If the old o-ring appears to be a standard size, i.e. 1/16 inch cross section, measure the outside diameter of the stem the o-ring fits on and multiply by .98 to give you the inside diameter of the o-ring you need. Go to an O-ring Sizing Chart http://www.marcorubber.com/sizingchart-oring-usa.htm and find a seal with those dimensions. For instance, you measure the stem and it's 0.244 inches. X .98 = 0.239 Find the o-ring on the chart with that i.d. (or slightly smaller) and you'll see a -010 is the correct size. As cheap as o-rings are, buy the next size larger and smaller and you should be all set. Alternatively, take the parts to the hardware store, find the correct size then order a Viton or EPDM seal.
A sincere THANK YOU to all at VDH who make this wonderful resource available and to all the thoughtful contributors.

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Fibonacci
Lung Diver
 
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Joined: Wed Oct 19, 2016 5:08 pm
Location: Melbourne, Australia

Re: Farallon SPG overhaul...

Wed Nov 23, 2016 2:50 am

Hi Couv
Thanks for your reply... I will check the back of the SPG to see if there is a blow out plug but I don't recall one.
I already have a good supply of the 003 spool o-rings thanks just chasing the others.
Great tip... will remeasure them and report back in case other VDH members need the info...

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Fibonacci
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Location: Melbourne, Australia

Farallon SPG overhaul...

Mon Nov 28, 2016 5:31 am

Fibonacci wrote:Hi Couv
Thanks for your reply... I will check the back of the SPG to see if there is a blow out plug but I don't recall one.


Flipped the gauge and there it is... black rubber plug!

Image

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couv
Master Diver
 
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Location: Houston, TX

Re: Farallon SPG overhaul...

Mon Nov 28, 2016 8:41 pm

Fibonacci wrote:
Fibonacci wrote:Hi Couv
Thanks for your reply... I will check the back of the SPG to see if there is a blow out plug but I don't recall one.


Flipped the gauge and there it is... black rubber plug!

Image


Thanks Fibonacci,

I must have had an oddball gauge. It's the only one I've seen without a blowout plug.
A sincere THANK YOU to all at VDH who make this wonderful resource available and to all the thoughtful contributors.

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