Poseidon Cyklon Service Advice

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Erik22

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Hello divers,

A friend of mine is selling his Cyklon. It’s likely pre 1995, so probably a Cyklon 300.

I should be able to get some photos of it in a few days. Not sure if it has the GSB 1/8” ports.

Is there anything specific I should know about these regulators, such as proprietary tools required?

I work as a sherwood/aqualung reg tech part time so I am familiar with the operating principles of most regs and the assorted terminology.

Just figured I might as well ask in advance, since there have been times that I have disassembled a reg and had a spring go flying (and never be found)

Thanks in advance,

Erik
 
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Erik22

Erik22

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Also, if someone has a service manual in PDF form that would be appreciated. I have the schematics but don’t know the “step-by-step” procedure.

Erik
 

SubseaSports

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Be warned, you are about to go down a wonderful side exhaust rabbit hole.
I started with 300s and now have a passion for Jetstreams.

I don't have a poseidon specific tools, but everything I already have works.

I will send you the manual(s) I have.
 

Bigbella

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Pre-1995 could still include the Cyklon 5000, since the 2950 was available back then. Here are several manuals in PDF, which include multiple options.

There are a few tools, which make working on them convenient, of which aftermarket versions are readily available, through Scuba Clinic; and if I could offer any advice, it would to be meticulous and quite clean when rebuilding, especially, the first stages, since it takes very little detritus to damage a piston or seat . . .
 

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Erik22

Erik22

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Thank you both for your fast replies!

I believe this journey could be both interesting and fun. In my spare time I have tinkered on Royal Aqua Masters and other assorted vintage regulators before taking the plunge and moving onto newer regs. I’m especially fascinated with regulator designs like the conshelf/titan and cyklon, which have changed very little over the last 60 years.

Erik
 

Bigbella

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I’m especially fascinated with regulator designs like the conshelf/titan and cyklon, which have changed very little over the last 60 years.

Erik
Yes, very little has changed, in terms of the Cyklon -- some updated silicone / polymer materials and some added complexity to the first stages; that, and a slightly lowered IP. The 300 once allowed for a maximum pressure of 12.5 bar, which has since been lowered to 12; and the other Cyklon models, to about 11.5 (at 20 bar).

In the photo, below, that uppermost, metallic second stage valve, dates from the 1960s; and the other, with the white ejector sleeve, from the early 1990s . . .
 

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Erik22

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I have seen on the Poseidon website that the reg is only “rated” to 164 feet, the maximum limit of the EN250 test. I have never seen depth limits on other literature I have read. Surely as a diaphragm regulator it can go deeper? And if my memory serves me correctly, Nuno Gomes used a Poseidon reg for his record dives?

And if I’m correct won’t a deeper depth make it easier to breathe on Poseidon regs, similar to the D series ScubaPro regs and the Air1/Pilot?

Erik
 

tbone1004

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The Cyklon is not servo assisted like the Jetstream/Xstream, it is a standard downstream regulator.

Depth ratings are to what it can pass via the EN250 tests, not that it won't function deeper than that.
 
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Erik22

Erik22

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I must’ve gotten it confused with the Jet Stream. Thanks for the clarification.

I went through the manuals and to install the diaphragm cover retainer ring it shows a large press. I understand the need for the press, but is it absolutely necessary or is it something I can pick up down the line? I could likely machine and weld a similar apparatus, if the need arose.

Here’s the press. I’ve seen one for sale on silent explorers at $200.
 

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Bigbella

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I must’ve gotten it confused with the Jet Stream. Thanks for the clarification.

I went through the manuals and to install the diaphragm cover retainer ring it shows a large press. I understand the need for the press, but is it absolutely necessary or is it something I can pick up down the line? I could likely machine and weld a similar apparatus, if the need arose.

Here’s the press. I’ve seen one for sale on silent explorers at $200.
There's also a cheaper route, through Scuba Clinic, that was reviewed, earlier this year:


Some can also manage to use a flat screwdriver or dissecting probe to fit the ring. I was shamed into trying it again, a while back, successfully; but managed to bloody myself once or twice . . .
 
https://www.shearwater.com/products/peregrine/

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