Sp 108

[redacted]

I put one of the Scubapro Universal DIN kits on a MK2 and it works fine. I think the only Scubpro model they won't fit is the MK5. If I had the use of a metal lathe for a few minutes I believe I could make them fit the MK5 also.

You just need to slip a brass washer or two to shim the retainer to make it bottom out before it damages the retainer o-ring. Then a little trimming of some excess plastic on a mk20/25 saddle and the din wheel will not bind.

Older Mk3s (and Mk2s I believe) have nut (female) style retainer so no din for them.

 

[NotSure]

You just need to slip a brass washer or two to shim the retainer to make it bottom out before it damages the retainer o-ring. Then a little trimming of some excess plastic on a mk20/25 saddle and the din wheel will not bind.

Older Mk3s (and Mk2s I believe) have nut (female) style retainer so no din for them.

If you put shims under the din bolt were do you put the "O" ring? It seems that you would have to put it right above the threads were there isn't a good sealing surface because the "O" ring groove almost protrudes from the top of the hole even without shims. I think the best solution is just to cut a few threads off the DIN wheel, that way you can use the "O" ring groove and the standard saddle. The only problem I can see is if you have 300 bar tank valves, because by removeing threads you would be making the 300 bar kit into a 200 bar.

 

[Wolfie]

I certainly like the idea of shims rather than trimming. Now that I have the masters attention. What about making it o2 ready for a deco rig? It,s a mk3 spec I think it was only produced 1985. With a r108 same era with the removable orifice.

 

[redacted]

If you put shims under the din bolt were do you put the "O" ring? It seems that you would have to put it right above the threads were there isn't a good sealing surface because the "O" ring groove almost protrudes from the top of the hole even without shims. I think the best solution is just to cut a few threads off the DIN wheel, that way you can use the "O" ring groove and the standard saddle. The only problem I can see is if you have 300 bar tank valves, because by removeing threads you would be making the 300 bar kit into a 200 bar.

The o-ring installs on the side of the retainer just like with the Mk5 yoke retainer. The universal retainer will accept a sealing o-ring on the end like with newer models (Mk10/15/20/25) or on the side like with the Mk2 and Mk5. The real problem is not that the din wheel binds against the saddle. That binding could be eliminated by omitting the saddle. The problem is that in order to apply torque on the retainer, the retainer seats so far in the it will damage the o-ring on the side (the o=ring get pushed beyond the sealing surface in the body into the threads). The Mk5 will not seal with an o-ring on the end like newer models (rectangular air passage in the Mk5 body rather than circular.)

I have never messed with high % O2. But the seat in a Mk3 is the same as a Mk2. I believe there are plenty of Mk2s in service with deco bottles.

 

[DA Aquamaster]

I used Mk3s as deco regs for years and would still be using them except I wanted to standardize my deco and stage regs, and thus switched to a Mk 10s.

The Mk 3, like the Mk 200 and Mk 2 Plus, is a flow by piston design with only two dynamic o-rings, both located in the IP section of the reg, so it is a very O2 friendly design.

As noted above the original Mk 2 and the the early Mk 3 (both 60s and early 70s era regs) have an "outy" inlet fitting rather than an "inny" and the DIN kits won't work on them. But if your Mk 3 is a "newer" model with 4 ports (3 LP and 1 HP) the DIN kit should work fine.

 

[parzdiver]

I put the standard ScubaPro DIN kit on my MK3 last night, it seems to fit just fine. I'm going to have to test it out this weekend.

 

[AFdivedoc]

Just a thought here. Regarding mk3 108 Is there a din kit that can be installed without couv whittling on it? And are there parts available to make it o2 clean.? It's so compact I just had a thought to turn it into a deco rig.

If you're talking the older Mk3 with 2 LP ports, 1 HP port and the flat filter, the Scubapro universal DIN kit won't fit, because the threaded post where the yoke and retainer nut attach is not removable. A Sherwood DIN converter works great on these, though. It screws right on to the post without any fuss. I've got an older Mk 3 and a couple of older Mk 2's I modified this way for deco regs, and I've had no problems with them. They perform just as well as newer regs. The newer Mk 2 and Mk 3 regs take the "universal" Scubapro DIN fitting.

Make sure it is the Sherwood converter for their older regs--Oasis, Brut, Blizzard, etc. I think they changed things up for the SR 1.

 

[Rich Keller]

You can also get good information at this site in the "manuals and catalogs" section.

Vintage Scuba - Vintage Scuba Gear at Vintage Double Hose

 

[Couv]

Just a thought here. Regarding mk3 108 Is there a din kit that can be installed without couv whittling on it? ....

???

couv hasn't even seen this thread yet, better try Awap's or AF Diving Doc's modifications.

 

[Wolfie]

Still haven't done the din conversion... Will do though, had a great dive with my doubles Saturday. Mk2 109 and mk3 108 finally had a full dive on this rig after getting them running tip top. Much nicer than my new Oceanics. And the chrome is too cool.

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And yes couv, you hadn't chimed in but we know you're the go to man when you need a unavailable part. Couv can make one........