fmerkel
Contributor
Bought a 2nd hand MK2/DIN from someone selling off excess kit I know. Don't have one and curious about the reputation for simplicity and ruggedness. I do have MK14, 15, and 20 that I've used for years and service myself. Mostly use them in DIN mode but switch to yoke for tropical travel.
I did not tank test it as received. It looked to be well used (not abused) and needing an overhaul as the selling clearly indicated.
Opened it up - damn, it is simple! Filter had minor contamination, the rest was clean and in good shape.
Ultrasonic cleaned the metal and Clean Green the rest. No new parts, not even O-rings. They all looked fine.
Assembled > leaked. Traced it down to the DIN insert. Started looking more closely at parts. Swapped out the inside O-ring for a new Viton > still leaked.
OK.....(critical?) differences. All my other SP regs are FLAT inside where the DIN adapter seals against the body.
The MK 2 body DIN opening has a reverse conical shape with a tiny hole on the edge that obviously feeds tank pressure to the HP opening. By visual inspection I don't see any way the DIN adapter CAN seal this. (Wish I'd tested it first).
On a hunch I added an EXTRA O-ring to the 2nd groove on the DIN adapter. The first groove holds the tightening knob on, the 2nd groove just seems to "be there". There is no indication anywhere I can find to put and O-ring there.
IT WORKED! No leaks, IP stable at 130, breathes fine. Pressurized it, turned off the tank, and the next morning all pressures were exactly as I left them. Seems to be solid. Is this a crazy solution? Is there a "proper" fix for this?
Questions:
1. Is the DIN adapter for the MK2 supposed to be different than the rest of the models to deal with the conical seat? How can this be made to work?
2. The only info I can find in [frogkick] is for MK2 PLUS. Looks pretty much what I have. I have no idea of which model I have. Is there a non-Plus? If so, what is the difference? Typical of these manuals, details are sketchy to non-existent. The troubleshooting guide and schematics don't add anything that is helpful for this.
Appreciate any help and experienced wisdom here.
I did not tank test it as received. It looked to be well used (not abused) and needing an overhaul as the selling clearly indicated.
Opened it up - damn, it is simple! Filter had minor contamination, the rest was clean and in good shape.
Ultrasonic cleaned the metal and Clean Green the rest. No new parts, not even O-rings. They all looked fine.
Assembled > leaked. Traced it down to the DIN insert. Started looking more closely at parts. Swapped out the inside O-ring for a new Viton > still leaked.
OK.....(critical?) differences. All my other SP regs are FLAT inside where the DIN adapter seals against the body.
The MK 2 body DIN opening has a reverse conical shape with a tiny hole on the edge that obviously feeds tank pressure to the HP opening. By visual inspection I don't see any way the DIN adapter CAN seal this. (Wish I'd tested it first).
On a hunch I added an EXTRA O-ring to the 2nd groove on the DIN adapter. The first groove holds the tightening knob on, the 2nd groove just seems to "be there". There is no indication anywhere I can find to put and O-ring there.
IT WORKED! No leaks, IP stable at 130, breathes fine. Pressurized it, turned off the tank, and the next morning all pressures were exactly as I left them. Seems to be solid. Is this a crazy solution? Is there a "proper" fix for this?
Questions:
1. Is the DIN adapter for the MK2 supposed to be different than the rest of the models to deal with the conical seat? How can this be made to work?
2. The only info I can find in [frogkick] is for MK2 PLUS. Looks pretty much what I have. I have no idea of which model I have. Is there a non-Plus? If so, what is the difference? Typical of these manuals, details are sketchy to non-existent. The troubleshooting guide and schematics don't add anything that is helpful for this.
Appreciate any help and experienced wisdom here.
