Advice wanted for M...
 

Advice wanted for Marauder air leak repair  

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phepler
(@deadeye)
Joined: 2 years ago
Posts: 85
2018-02-21 08:59:19  

I would like your advice, suggestions, and video links on how to repair a air leak on my .177 Gen 1 Benjamin Marauder. 
The air leak is more noticeable from the breach and out the barrel at lower fill pressure- 2200 lb and lower. I've only been in the PCP game for a year or so, but I'm assuming it needs new o-rings on the valve. I've never pulled the action apart down to the valve but am more than willing to fix it myself. So if you have some favorite video links or advice I would love to hear from you. 

Fist question- do I need to lube be o-rings with silicone?

Thanks


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Steve in NC
(@steve-in-nc)
Dealer
Joined: 2 years ago
Posts: 332
2018-02-21 09:35:12  

Air leaks from the breech and/or barrel typically result from a defective valve stem

not from O-rings.

Crosman customer service is your source for replacement parts.

https://support.crosman.com/hc/en-us/articles/203544950-BP2263-Owner-s-Manual-EVP-2010-Present-


CarlosMendez and jjmaine thanked
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Brian Smith
(@brian-smith)
Joined: 2 years ago
Posts: 79
2018-02-21 09:36:51  

Your best friend for this is Google.  I learned a lot there just by looking and watching the videos some nice guys put on.  One thing I know, If I can do it you can do it.  Brian


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Brian Smith
(@brian-smith)
Joined: 2 years ago
Posts: 79
2018-02-21 09:37:51  

Oh and Steve knows what he is talking about.  Brian


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phepler
(@deadeye)
Joined: 2 years ago
Posts: 85
2018-02-21 09:41:04  

Thanks Steve and Brian!


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phepler
(@deadeye)
Joined: 2 years ago
Posts: 85
2018-02-21 10:18:38  

What does a bad valve stem look like? Corrosion?

Thanks


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jjmaine
(@jjmaine)
Joined: 2 years ago
Posts: 54
2018-02-21 12:25:26  

Might try to put a few drops of silicone oil in the fill port, fill the gun up to get the oil in the tube and dry fire the gun 5 or 6 times in quick succession.  There may just be a piece of small debris that got into your valve and is keeping the valve poppet from sealing.  I had this same issue with a new discovery that I bought from pyramyd air and when I called, one of their airgun techs told me to try this and it worked and solved my leak.  Can't hurt to try before breaking down the gun.

 

Make sure you use SILICONE oil (I used crosman silicone chamber oil) anything else is NOT safe to use in a HPA gun.


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jjmaine
(@jjmaine)
Joined: 2 years ago
Posts: 54
2018-02-21 12:26:44  

Forgot to mention that Tom Gaylord said in one of his blogs that he does this in all his pcp guns periodically just to keep internal seals from drying out...


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phepler
(@deadeye)
Joined: 2 years ago
Posts: 85
2018-02-21 12:34:21  

Thanks!


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CarlosMendez
(@carlos-hombre)
Joined: 2 years ago
Posts: 76
2018-02-21 22:23:53  

What Steve and jjmaine said.


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phepler
(@deadeye)
Joined: 2 years ago
Posts: 85
2018-03-01 09:54:03  

Thanks for the advice and suggestions. I dove in deep!

Found badly stripped threads in the gauge port- enough to have metal bits flaking off. Also found a very stretched o-ring on the valve. The Valve stem looks generally OK where it seats, but a little rough around the edges. I ordered a new gauge port, set of rings, and valve stem.

IMG 4978

IMG 4980


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phepler
(@deadeye)
Joined: 2 years ago
Posts: 85
2018-03-01 18:51:18  

Question- what should I use to clean internal parts like the valve and tube? Alcohol? 


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