i upgraded my mk2 to used m3 power block, i used the valvestem from mk2 power plenum sets, there is a slow leak and air hiss out of barrel, do i need to change the new valvestem/rod ?? whats your suggestion ?? i dry fire a few time still leaks .
impact m3power block fit to mk2 leak on barrel
- Thread starter Jacobpc
- Start date
I would definitely try the different valvestem/rod. Also make sure you lube up the o-ring’s when reinstalling.
Upvote 0
If you look at the complete upgrade kit they show a new rod and other things. I do not know if your plenum kit came with any of the parts. 
Upvote 0
Yes you need the
I'm pretty sure you need the new valve rod. Did you look in by where the magazine goes to see if the valve rod is seated all the way?
Upvote 0
yep, new valvetube etc,, i think the valve stem/rod is same with the valvestem that came with the mk2 power plenum... is that right ??
Upvote 0
yes , yaeh the valve rod is seated nicely and flushed.. if your gun leak the same location like mine, what would u do? buy new valve rod ?? just want to know yours opinion ..
Upvote 0
If you have all of those parts..... look at the plastic piece at the end of the valve rod. The cone looking piece may have a small nick or something in it preventing it from creating a good seal. You can typically fix this with some very fine emery cloth and either a drill or a lathe. Just want to polish it and not really remove to much material
Upvote 0
I would call FX USA and ask if the valve rods different for the power block. Or call Spaw or Utah Air. They will definitely know. If it's the same then it could be that tiny O ring on the end.
Upvote 0
Wow, I never compared the two. All I saw was one was newer and slightly longer maybe? I knew they provided a new one for a reason.
Allen
Allen
Upvote 0
I’m curious on why you decided to use the old rod? Mine is 2 years old and even if they are identical I would still change so the orings are refreshed/resealed.
Upvote 0
The valve pin in the MKII power plenum(not the pre-power plenum) is the same as the power block valve pin.
Upvote 0
i thought they are same, the valve rod is like brand new, no scratch on delrin , still seal when used on mk2 power plenum, if i knew the valve rod is not same, i will never used it, i ll surely buy the new rod
Upvote 0
i already order the valve rod 20275 , its on the way, will update weather the problem is fixed
Upvote 0