I pulled apart two MK25 last night and found they had a hard putty like substance on the IP adjustment set screw. The other I've seen didn't have this. Any ideas?
Phil
Phil
Putty on SP MK25 IP Set Screw
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halocline
Contributor
It's possible that it was ptfe grease (cristolube) that dried up and separated.
Scubapro specifies a separate grease for the IP adjustment set screw. It's VERY expensive for the amount used. The reason for it is to minimize set screw drift after service. It is much thicker than Christolube MCG-111.
But since my shop is in boxes with my references from the SP Clinic, I can't remember the part number or brand.
If you wanted to DIY, it doesn't have to be oxygen safe, but I haven't got a suggestion for you.
Using Christolube or Tribolube 77 will make you more prone to IP drift. And if somebody touches that hex fitting with a wrench, it takes about half an inch-pound of torque to screw things up completely if you've used Christolube (from experience).
My rec is to NOT disassemble that screw, nor clean it off when you service your reg. If you've done both, then don't lube it at all.
Rob
But since my shop is in boxes with my references from the SP Clinic, I can't remember the part number or brand.
If you wanted to DIY, it doesn't have to be oxygen safe, but I haven't got a suggestion for you.
Using Christolube or Tribolube 77 will make you more prone to IP drift. And if somebody touches that hex fitting with a wrench, it takes about half an inch-pound of torque to screw things up completely if you've used Christolube (from experience).
My rec is to NOT disassemble that screw, nor clean it off when you service your reg. If you've done both, then don't lube it at all.
Rob
axxel57
Contributor
I got myself for that applications the Chesterton Goldend Paste, a bit expensive, but lasts endless............
View attachment MK25 ADJUSTMENT SET-SCREW PASTE.pdf
View attachment MK25 ADJUSTMENT SET-SCREW PASTE.pdf
Just use whatever you are using on the orings....says right in the manual Crystolube or silicone are acceptable alternatives, odds are you are using one of those. See axxels PDF.
OP
I'm no regulator engineer (obviously) but this set screw is outside the clean air part of the reg and there is no chance of the thread sealant leaking into a 3000 psi system so why didn't they recommend something more common/off the shelf.
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