FX Where are the M3 Power Block orings sizes?

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bigHUN

bigHUN

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Jan 16, 2020
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I have an 720 c upgrade kit on my MK2, with well over 10K shots in it since this install.
The Reg (still the original MK2) started creeping a not long ago, so yesterday I did a Service on it = polishing the pistons (plastic and brass) to mirror finish and re-pack it with new orings. A side note, last time I polished these pistons somewhere back in 2021 and no Reg creep for several years, only recently. The indent was pronounced in the black piston part and I removed it.
Air it up and the Plenum was leaking from front "Valve Tube End" regardless that I dry fire it. So that oring gave up on me.
No problem, I toke the MK2 apart again fully, I will repack this thing (Plenum+Power Block) fully as well.
I know that there are orings in the Rear Block = Power Block, but not seeing it in the diagram showing for F110...

Can I assume the E109 (4 pieces) two will go in to the Plenum Tube and two will go into Power Block? This is the only BOM available from FX.

Power Block orings.JPG
 
bigHUN said:
I have an 720 c upgrade kit on my MK2, with well over 10K shots in it since this install.
The Reg (still the original MK2) started creeping a not long ago, so yesterday I did a Service on it = polishing the pistons (plastic and brass) to mirror finish and re-pack it with new orings. A side note, last time I polished these pistons somewhere back in 2021 and no Reg creep for several years, only recently. The indent was pronounced in the black piston part and I removed it.
Air it up and the Plenum was leaking from front "Valve Tube End" regardless that I dry fire it. So that oring gave up on me.
No problem, I toke the MK2 apart again fully, I will repack this thing (Plenum+Power Block) fully as well.
I know that there are orings in the Rear Block = Power Block, but not seeing it in the diagram showing for F110...

Can I assume the E109 (4 pieces) two will go in to the Plenum Tube and two will go into Power Block? This is the only BOM available from FX.

View attachment 472930
Click to expand...
The pic you have shared is of M3 without power block.

Now 1st of all you need to conclude if your gun has power block or not. 720 plenum came with early non power block as well as with newer power block. But the sealing O rings specs in power block and non power block are different.

In your pick you have highlighted the valve housing.
 
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bigHUN said:
You guys right, I just realized from where is my confusion :)
revision 21.01
revision 23.01
When I upgraded my MK2 with 720c Plenum I got the new Power Block in the kit.

View attachment 472976

View attachment 472977

When you compare these two BOM's, each missing some orings....

I need to check my orings, I remember ordering but that was somewhere last year and which revision I was looking at?
Click to expand...
Lower pic is of power block version.

23.01
 
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bigHUN said:
revision 21.01 missing the orings inside Power Block
revision 23.01 missing the orings in between Plenum to Valve Body
Click to expand...
21.01 is pic of non power block. It doesn't have O rings inside the block rather the O rings are on the valve housing.

23.01 which is your model doesn't have O rings on the valve housing rather the O rings are inside the block.

I don't find anything to get confused in it.

You will replace the O rings from inside the block if those O ring are bad. These seal between the valve housing and valve body.
 
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mubhaur said:
That is only one O ring and that is inside the large plenum tube.
Click to expand...
Yes, the E106 has an oring and not listed anywhere.
I like to replace all orings that have been pressurized earlier and now exposed to air.
I have a spreadsheet for all my orings, 87 different sizes need to track my own stock, usually buying in bags of 25 from oringsandmore.
 
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bigHUN said:
Yes, the E106 has an oring and not listed anywhere.
I like to replace all orings that have been pressurized earlier and now exposed to air.
I have a spreadsheet for all my orings, 87 different sizes need to track my own stock, usually buying in bags of 25 from oringsandmore.
Click to expand...
Good that you are in a better position now.

Sorry for anything I said a bit harsh. Didn't intend it, just became a bit casual.
 
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I still have the replaced original MK2 (power) Plenum parts - just in case. Almost put these back couple times in the past....
Measured the "old" Valve Body is same diameter as the new 720c Plenum Valve Body - 15.88 mm dia.
Huh, I am on safe side, have all the orings ready in my hands.

Btw :) no "a bit harsh" comments can push me off my track, I am well trained since teenage :)
 
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