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Impact MK1 (.30) air leak after Power Block upgrade

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A

aramos1322

Member
Nov 30, 2020
22
1
Round Rock, TX United States
I'm looking for some help with an air leak.

I purchased #20839 (power block upgrade kit) and performed the upgrade as shown in videos by Mr Rowe as well as those referenced by UA and Airbuks.

I was very careful to inspect, install o-rings, lube and not force anything.

As soon as I screw in my bottle and pressurize the rifle, air leaks from the regulator gauge area. Seems like from the gauge or magazine mount where it mates with the block.

The old block has the valve and stem flush whereas the new block looks different. The valve sits 1/8" below flush of the stem. FX says it should look that way.

I have attempted the install 4 times.
When the rifle is placed back in its original factory configuration, it holds air and shoots jsb hades around 820 fps.

Did I take a wrong turn?
Any suggestions are appreciated.

Thank you.

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MongooseV8 said:
Did you measure and adjust the very front of the valve rod assembly? Mine is flush on my MK2. If its not fully seated the main valve seal can leak by. I would re-measure double triple check the part C-1. You might need to adjust it forward or counter clock wise a mm or so.

Click to expand...
Thank you for your reply.
I'll check into this and reference the pdf.

The measurement I received was 6.2 mm (frame to top of C1.
 
Upvote 0
Hi
I don't know if this publication will be of any help to you.

Air loss through the barrel when installing M3 powerblock kit

Hi I have installed a powerblock on an M3.The M3 kit is reduced in the number of parts that compose it. I have to mount a new Valvehouse, Impact, Power Plenum part number fx 20671 in which the valve seat is included with a used part which is the valve part number fx 20275. The problem that...
www.airgunnation.com www.airgunnation.com
Regards
Enkey

Edit. Yess the new valve doesn't fit flush in the back register
 
Upvote 0
Airgunmann said:
The 720 plenum installed on my mk2 is the same way it is inset about the same as yours did u put the quad ring under the gauge in the new block ?
Click to expand...
No sir.
I was unaware I needed to place something there as my existing reg gauge doesn't have one.

This sounds like the probable cause.
The screw in to the power block is deeper and the reg gauge seems to bottom out.

Do you have more details or a picture maybe?
I appreciate your help.
 
Last edited:
Upvote 0
Enkey said:
Hi
I don't know if this publication will be of any help to you.

Air loss through the barrel when installing M3 powerblock kit

Hi I have installed a powerblock on an M3.The M3 kit is reduced in the number of parts that compose it. I have to mount a new Valvehouse, Impact, Power Plenum part number fx 20671 in which the valve seat is included with a used part which is the valve part number fx 20275. The problem that...
www.airgunnation.com www.airgunnation.com
Regards
Enkey

Edit. Yess the new valve doesn't fit flush in the back register
Click to expand...
I appreciate it.
 
Upvote 0
Airgunmann said:
There should be one in the old block u can probably reuse
Click to expand...
I bought my MK1 used.
It doesn't have one so I'm surprised it has held air.

Lol.

I have replaced almost all o-rings. The critcal one was the regulator o-ring.

There is one on my captain o-ring kit that looks like it fits but I'd prefer an x -ring.
 
Last edited:
Upvote 0
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