Wayward Son
Contributor
haven't installed one yet. I have one more G250V to do but need to do some 1st stages first. I may do that one this weekend too.
109 BA
- Thread starter Landlocked92
- Start date
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Rusty Shackleford
Contributor
I call those Top Hat poppets.
Wayward Son
Contributor
I'm fairly new to this. I still dive a Mk5/109 set I bought new in 1978 as well as 4 other reg sets that I have to maintain, all Scubapro. Prior to the change, 10 of these statges were bought new, from an authorized dealer & had been serviced annually by that dealer for some years. Scubapro screwed me on all 10 stages, not one ended up being covered.
When I moved down here I found the 1 LDS in town, he has SP and services them. I ended up pay absolute top $$$$ to get 2 sets serviced & of the 2 he screwed up my primary, a G250V. I never took it back, nor have I ever set foot in that shop again. It turns out he has some rather insane policies regarding tanks, which ended up being strikes 2 & 3.
It resulted in me deciding that that jackass was never going to touch any of my gear again & taking a hard look at the numbers & I decided that I could spend about as much as an annual service for all 4 sets & have all the tools to do my own plus some of the service parts so it was game on.
I bought a used Mk5 and Mk10 to learn on, did those. Now I've done my 4 109/BA 2nds, 1 G250V and 1 more to go and am starting on my own 1st stages. I'm cleaning th 5 now, have a Mk2, Mk25 and Mk11 to go. I have kits for the 2 & 25 but not yet the 11.
I'm not keeping any of my plastic unbalanced 2nds. I still need 2 more 109's to swap out on my daughters set.
When I moved down here I found the 1 LDS in town, he has SP and services them. I ended up pay absolute top $$$$ to get 2 sets serviced & of the 2 he screwed up my primary, a G250V. I never took it back, nor have I ever set foot in that shop again. It turns out he has some rather insane policies regarding tanks, which ended up being strikes 2 & 3.
It resulted in me deciding that that jackass was never going to touch any of my gear again & taking a hard look at the numbers & I decided that I could spend about as much as an annual service for all 4 sets & have all the tools to do my own plus some of the service parts so it was game on.
I bought a used Mk5 and Mk10 to learn on, did those. Now I've done my 4 109/BA 2nds, 1 G250V and 1 more to go and am starting on my own 1st stages. I'm cleaning th 5 now, have a Mk2, Mk25 and Mk11 to go. I have kits for the 2 & 25 but not yet the 11.
I'm not keeping any of my plastic unbalanced 2nds. I still need 2 more 109's to swap out on my daughters set.
Wayward Son
Contributor
Mk5 is done, ready to dive.
Mk2 in the ultrasonic. It's not too bad, didn't get dove that much either but maybe more SW than the 5 saw. Super simple design.
Mk2 in the ultrasonic. It's not too bad, didn't get dove that much either but maybe more SW than the 5 saw. Super simple design.
Wayward Son
Contributor
Mk2 is done, ready to dive.
Now to convince myself to take the Mk25 apart...
Now to convince myself to take the Mk25 apart...
You're in 'Bama?
Wayward Son
Contributor
Mobile
halocline
Contributor
You shouldn't have any trouble with the MK25 if you've done a MK 5 and MK10 successfully. Feel free to post any questions and you'll get lots of responses. It is really nice to have the correct o-ring/bushing insertion tool for the MK20/25. One tip for the MK25, clean and polish the piston dull edge very carefully and inspect it with a jewelers loupe. Any imperfection or foreign material and you will get some IP creep. Dog hair is especially effective at producing creep, no need to ask how I know that.
Those aftermarket balanced poppet seats will almost certainly work fine, but I suspect they are slightly different in thickness and hardness than the SP OEM seats. It shouldn't matter much. You might notice that tuning is a little less precise with them.
Those aftermarket balanced poppet seats will almost certainly work fine, but I suspect they are slightly different in thickness and hardness than the SP OEM seats. It shouldn't matter much. You might notice that tuning is a little less precise with them.
Wayward Son
Contributor
I have the o ring tool. Is the allen wrench size for the DIN adapter a 6mm? It feels like the right fit but it hasn't released yet & I don't want to put too much pressure on it without being sure of the tool size.
Rusty Shackleford
Contributor
The critical step on the MK-20/25 is to make sure the bushings that fit on either side of the piston stem HP O-ring have the mold marks facing AWAY from the O-Ring. There is a correct side to those parts and an incorrect side.
Do you have the MK-20/25 service documentation?
Do you have the MK-20/25 service documentation?
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