My marauder ft has a slow leak and is losing 2-300 psi overnight. I first used a soapy water solution on the fill area and gauge area but found no bubbles. I removed the trigger and hammer and dunked the airtube into a sink with water and found one small bubble every few seconds where the fill adapter meets the air tube and rapid bubbles from the vent where the regulator is. I didn't see any around the gauge, the transfer port, or the back of the valve. I assume that the bubbling from the regulator vent is just air leaving the space around the middle of the regulator or could there be a leak there? After degassing, and opening the air tube there was a lot of hard crud/buildup under the o ring of the fill adapter and some slight crud at the front o ring of the gauge block. I cleaned both areas and replaced all of the o rings being careful not to cut them over the gauge opening. Unfortunately the rifle is still leaking. I even went back and cleaned the nipple end of the fill adapter and placed new teflon tape where it attaches to the other part of the fill port. Any ideas where the leak could be coming from?
Tuning marauder field and target leaking
- Thread starter rong1966
- Start date
I'm no expert, but in a static situation, I don't think you should see any air escaping through the weep hole. Think you have air leaking past the reg O ring.
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"one small bubble every few seconds where the fill adapter meets the air tube" - Yea that is exactly what mine was doing when it started the very slow leak thing about 3 months after I got it a few years ago. The black Teflon tape they used failed. Don't they put enough layers on it.
Only problem I have ever had with it - a GREAT GUN!
Only problem I have ever had with it - a GREAT GUN!
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If you search for paintball tape from ansgear you will find some of the thickest and easiest thread tape to use on any threads that are leaking. They also sell a thicker yellow pipe tape there and that works fine but that ninja paintball tape it the best. If I were you I'd buy the tape and just replace every single seal in the gun. If that doesn't fix it you probably need a new check valve in the foster fitting. Sometimes little debris get inside and make it leak. Good luck to ya
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Changed o rings again, cleaned fill nipple and changed teflon tape at nipple and there is still a steady stream of bubbles coming from the regulator vent even after being submerged in water for 30 minutes. Lost 500 psi overnight. It could be that the hardware store o rings aren't doing the job so I ordered some from the o ring store. Hopefully that will stop the leak.
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Yes, I replaced all six large o rings--one at the fill adapter, 2 on the gauge block, 2 on the regulator and the one on the valve.
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BP Benjamin Marauder O Ring Seal Kit .177 https://www.amazon.com/dp/B01N2QLN06/ref=cm_sw_r_cp_api_glt_fabc_QYC06JXR0Q0MGPNR6AHK
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SqrlHntr
Member
Im wondering if the rings are/were getting knicked even from the factory. Happened to one of mine and sounds similar. I would suggest the next time you have the airtube open, deburr the gauge port and lightly hit the fill adapter thread area with some 3-6k paper. Clean and dry, little silicone grease. As far as tape goes, the only tape i use is the yellow stuff and only needed it for the gauge before the design changed.
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I got my new o rings and the rifle is still leaking. Could the regulator itself be the cause of the leak? I sent an email to Crosman and I''ll call them Monday if I don't hear back.
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Sounds like the valve might be leaking where the firing pin is. Could be the same debris buildup as the rest of the tube, or an actual plunger seal in the air valve. The reg only controls pressure internally. It doesn't shut off air. The main valve is where the air is shut off. The main valve can also be rebuilt with new seals and spring.
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Hello rong1966. Just following up on my previous advice, you said the regulator was the cause of the leak. Was it the O rings or an internal reg failure? what are you calling the reg because I have a Benjamin Armada that didn't have a internal reg only the valve assembly. Is this what you mean when you say regulator?
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I assume it was an internal regulator failure since I had changed the external o rings three times on the old regulator and it still leaked. The Marauder field and target has a regulator installed from the factory.
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In the past I have had PCP guns that began to leak over time yet stopped after a couple of fills, I can only imagine this was because of debris/oil moving along the seals and eventually allowing them to seat again. My marauder has been rock solid since I got it, but just some food for thought if this happens to you again.
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Finally got the gauge adapter/gauge port leak in my Mrod F&T fixed by replacing the o-ring with a viton? washer supplied by customer service. Took a lot of back-and-forth with them but the leak is fixed (knock wood) and am really glad that Crosman is an American company.
OFG
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