Removing Box Top from US Divers 2nd Stages?

[tech3324]

I picked up a really clean US Divers SEA4 regulator that came with a SEA4 plastic 2nd stage and LPO octo. Both of those 2nds have screw-on box top (purge cover) that are frozen in place, way beyond hand tight. Any tips for getting those unscrewed without damage? I thought a strap wrench might work but the grip surface is only 3mm high and sloping.

 

[RainPilot]

Lay them face down in shallow hot water, expansion differential has usually worked for me with other things before.

 

[buddhasummer]

As RainPilot says, I've always had success soaking in hot water. Using a piece of silicone helps with grip. Good luck.

 

[runsongas]

face spanner might work also

 

[buddhasummer]

face spanner might work also

Yes, I made one for my G250s for about $4.

 

[tech3324]

face spanner might work also

Is that like a pin spanner? I'd need to drill a couple of holes?

 

[richmonddiver]

By the looks of my plastic box tops, it appears that at least one tech has placed a screwdriver through the vent holes and opened them that way. There is deformation with a radius about the size of a small screwdriver on opposite sides of the face. It seems like others have found more elegant means.

 

[Curtis C]

I picked up a really clean US Divers SEA4 regulator that came with a SEA4 plastic 2nd stage and LPO octo. Both of those 2nds have screw-on box top (purge cover) that are frozen in place, way beyond hand tight. Any tips for getting those unscrewed without damage? I thought a strap wrench might work but the grip surface is only 3mm high and sloping.

I use a medium size needle nose vice grips on my G500. Just adjust until its the right size. Works perfect. Looks like it might work on that reg.

 

[tech3324]

I use a medium size needle nose vice grips on my G500. Just adjust until its the right size. Works perfect. Looks like it might work on that reg.

That's a good idea but this reg has vent slots on only one side, so I may have to insert a large screwdriver blade and lightly tap on blade with a hammer. I have it soaking it warm water now.

 

[gfaith]

Not sure but I saw this on the Vintage Double Hose forum.

Re: Get front off SE4 2nd stage!
Wed Jul 06, 2016 4:10 am

Ok answered my own question. (Its an SEA4 2nd stage BTW)
You have to remove the Port plug opposite the hose entry - which releases a plastic ring with a tab on it - that locks the diaphram cover in place. Simple.
Might help someone else.

That may not be any help at all... Can't see that side of the 2nd.