How to restore a Scubapro D300, D350 & D400: Theory and Practice
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scrane
Contributor
Similar idea. Marked ITALY and SCUBAPRO and PAT. PEND.
That’s kind of funny, the D’s being discussed are a long way from being “modern” the only modern D is the 420 and it’s performance is so good that I’ve all but given up on inline designs except as safe seconds. The 420 is very easy to service but it is more complicated than the things developed in the 60’s
I was also in the inline balanced camp for years and sat out the center balance poppet era, until now. The D420 is my preferred second stage it’s not dead simple but neither is it’s performance, the D400 et-al are pretty amazing performers and my main gripe with them (other than general parts availability) is the “rubber” diaphragm cover, I bet @James79 could print out a two piece cover that would/could get a lot of these old beasts back in service.
Anyone who has D420 for sale I would be interested in buying.
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Unbelievable!
Who does this
Unbelievable!
OP
Well, learned something new (duh!).
When expecting to struggle with pulling the case off a gnarly old D, I'd left the hose on while I took a preliminary look at the condition of the valve inside.
To my surprise, the stiff case came off easily, because the hose acted as a handle against which I could pull. My new plan? Always leave the hose on until the case is gone. I'll edit the post above.
When expecting to struggle with pulling the case off a gnarly old D, I'd left the hose on while I took a preliminary look at the condition of the valve inside.
To my surprise, the stiff case came off easily, because the hose acted as a handle against which I could pull. My new plan? Always leave the hose on until the case is gone. I'll edit the post above.
scrane
Contributor
More than one way to skin a cat.
scrane
Contributor
I work on all my regulators except the D400. When it comes time for servicing my D400 off it goes to @rsingler for his special treatment. He has parts and is meticulous in his work. If you have an active D series regulator or one that has been gathering dust for years I would urge anyone to take advantage of his skills. The D300, D350, and D400 are still some of the easiest breathing regulators ever made.
Here's mine a few days ago!
Here's mine a few days ago!
halocline
Contributor
I have several D300s and they are fantastic breathers. I don’t find them difficult to work on, unless you have to remove/replace the pre-dive spring, then it becomes an entirely different experience!
Once again, a great thread, just excellent work by Rob to share this detailed information.
Once again, a great thread, just excellent work by Rob to share this detailed information.
Redbeard04
Registered
I recently bought and restored a mk20/D400 combo and have it cracking at .8 inches of water. I am looking forward to diving it but it came with a cracked rubber diaphragm cover. Does anyone have a spare in good shape they are willing to part with?
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