.177 Marauder leak

[Westwind]

My .177 MRod is leaking so I replaced the O rings but it is still leaking.
When I took it apart it had tons of silicone grease in the tube so I 
cleaned that out (mistake?) put new grease on new O rings and put
it back together. I did use the tool that fits in the gage hole to prevent
cutting the O ring. I hope it's not a valve or something but it could be.
Any help would be appreciated.

i suppose I need to take it back apart and see if I have bad O ring.

Mark

 

[BigTinBoat]

Squirt some leak test solution on the gauge and fill port to see before disassembly. Then you can take the breech off and squirt it on the TP to see if valve poppet is leaking.

You can get leak test solution at hardware store or make your own from some dish detergent and water.

 

[Westwind]

Thanks sometimes I forget the obvious.

 

[Hookster]

Both of my Mrods leaked at the fill port assembly. For under 20 dollars you can order a new one online. If you cant find an oring issue I would look there. One way to test it for this leak is install a deadhead foster over the fill port and see if it holds air overnight. Hope you find the leak. 

 

[DeadEyeNC]

Had a leak with my gen 1 Marauder- turned out to be a bad valve stem. Air was leaking our the breach and barrel. Basically the material around the valve stem seat started to deteriorate causing a improper seal. Once replaced I was good to go.

 

[Fglass]

Itcould be a nicked o ring. Check themit don ake long.

 

[Dan25]

I bet you have a nicked o ring from sharp edges on the cut outs in the air cylinder. I tried several times to polish them with sand paper but they still nick the o rings every time. Going to have to get the cylinder honed with a ball hone.

 

[Westwind]

I finally got around to working on th.177 after 4 attempts and a trip to the hardware store 

to get more O rings I think I got it. It was leaking by the gage. I tried finger tight, slightly more than

finger tight but it just would not hold. I noticed the sealing serfaces did not look smooth so I 

shined them up with scotch bright and got it as smooth as I could make them. We will see if

it holds over night. While I had it apart I put in an HDD but that's a hole not her story.



Mark

 

[Westwind]

Looks like I got it held air overnight! Now I can see how theHDD works.

Mark

 

[Xbowsniper]

Westwind, 



Another easy way to discover where it is leaking, put a balloon over the foster fitting end, and put another one on the barrel. If it leaks through either, the balloon will stand proud. If it leaks through the barrel, it could be a valve, OR you have the hammer adjustment all the way out, and hammer spring tension high, that could hold the valve open slightly as well. If the Foster fitting leaks, it needs a new o ring or replacement.



Tom Holland