Earlier models of the D400 did not include the spring pad PN 11.015.306.
To complicate things, Scubapro changed the name of the relevant parts from
11.011.106 "Spring Pad" for the G300/350/400
to 11.015.206 "Adjustment Pad" plus 11.015.306 "Spring Pad" for the later G400. The two "Spring Pads" are completely different parts. I'll have to pull out a late G400 to compare the 11.011.106 with the 11.015.206.
I have a call into my supplier to see if Scubapro still has any 11.015.306 Spring Pads in stock so I can grab some, but here's a workaround that gives you 0.7-1.5 mm of spring compression (one or two shims).
As many of you have noted, the adjustment cap (whether you call it a Spring Pad or Adjustment Pad) is often screwed far into the reg to get a high enough cracking effort. That's one beauty of the old G400 - you could tune it to 0.4" and still not freeflow, with that beautiful coaxial diaphragm/exhaust valve. With all the evolutions in the poppet sealing surface over the years, sometimes it took all the depth of the adjustment cap to get even that, which may be why they introduced the spring pad at the end.
In any case, here's a workaround that will give you an additional 0.7-1.5 mm of spring compression and still leave enough nipple inside the adjustment cap to keep the spring centered.
A McMaster 91545A270 Nylon Plastic Washer fits perfectly. It's billed as "Lubricant-filled" and looks like there's a little graphite in the nylon. About 50 cents each (plus their shipping, of course).
BTW, the McMaster 1295N117 Viton 1mm x 4.5mm duro 70 oring is a workable replacement for the poppet shaft oring 01.050.323. The original blue oring was billed as duro 50, but this one seems to seal well without binding or changing cracking effort.
To complicate things, Scubapro changed the name of the relevant parts from
11.011.106 "Spring Pad" for the G300/350/400
to 11.015.206 "Adjustment Pad" plus 11.015.306 "Spring Pad" for the later G400. The two "Spring Pads" are completely different parts. I'll have to pull out a late G400 to compare the 11.011.106 with the 11.015.206.
I have a call into my supplier to see if Scubapro still has any 11.015.306 Spring Pads in stock so I can grab some, but here's a workaround that gives you 0.7-1.5 mm of spring compression (one or two shims).
As many of you have noted, the adjustment cap (whether you call it a Spring Pad or Adjustment Pad) is often screwed far into the reg to get a high enough cracking effort. That's one beauty of the old G400 - you could tune it to 0.4" and still not freeflow, with that beautiful coaxial diaphragm/exhaust valve. With all the evolutions in the poppet sealing surface over the years, sometimes it took all the depth of the adjustment cap to get even that, which may be why they introduced the spring pad at the end.
In any case, here's a workaround that will give you an additional 0.7-1.5 mm of spring compression and still leave enough nipple inside the adjustment cap to keep the spring centered.
A McMaster 91545A270 Nylon Plastic Washer fits perfectly. It's billed as "Lubricant-filled" and looks like there's a little graphite in the nylon. About 50 cents each (plus their shipping, of course).
BTW, the McMaster 1295N117 Viton 1mm x 4.5mm duro 70 oring is a workable replacement for the poppet shaft oring 01.050.323. The original blue oring was billed as duro 50, but this one seems to seal well without binding or changing cracking effort.
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