Author Topic: S510 leak/ dumping air  (Read 490 times)

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Online airgunnut

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Re: S510 leak/ dumping air
« Reply #10 on: August 13, 2017, 12:23:02 AM »
Remember to use oring grease that is rated for high pressure air (100 bar +) if you use normal grease your gun will probably explode.

Thanks for the advice.  I was planning to lubricate the seals with Abbey Silicone Gun Oil - is that suitable, or do I need something else (and what do you recommend, please?)
http://www.magic9designltd.com/product-prices
The silicone grease is rated for high pressure pcp
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Online Gambo

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Re: S510 leak/ dumping air
« Reply #11 on: August 13, 2017, 09:47:59 AM »
Yep, Abbey silicone oil is fine, as would a silicone grease.....but whatever you do, don't use a mineral based product.

Offline davmor

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Re: S510 leak/ dumping air
« Reply #12 on: August 19, 2017, 03:34:06 PM »
OK, got my dive bottle back today (apparently only 2.5 years now before test, due to a change in regulations?!  D'oh!) so ready to make a start as soon as I can get some peace and quiet to work on it...
S510 .177 with AGS 3-9x40 (illuminated), S200 .177 with 10-shot conversion and Simmons 44 Mag 3.8-12x44mm Diamond WA, Webley Xocet .22 with Simmons Deerfield 3-9 x 50, Weihrauch HW45 .177/.22 barrels with Dowling & Rowe red dot, Walther CP88 .177

Online Gambo

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Re: S510 leak/ dumping air
« Reply #13 on: August 19, 2017, 09:02:53 PM »
Please keep us informed of developments Mucker. ;)

Offline davmor

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Re: S510 leak/ dumping air
« Reply #14 on: August 19, 2017, 11:31:44 PM »
Ok, so cocked the rifle and gave a fill of air - was able to get fill pressure up to 190 bar but it was obvious that it wasn't behaving normally.  Pressure began to drop immediately (albeit slowly).  Balloon over muzzle (left silencer in place) stayed deflated - was able to fire gun (no pellet!) which obviously inflated the balloon slightly, but a few repeated cocking/ firing cycles showed no anomalies.  However, placing a balloon over the fill valve showed the problem straightaway as the balloon began to slowly, but steadily inflate. 

My plan now is: leave the rifle to de-pressurise overnight, then fire off remaining air before removing the fill valve (10mm spanner on flats at T-bar end) and replacing the "hidden" seal, plus the two visible seals above and below the filling valve port.  I will lubricate all seals with Abbey Silicone oil.  I'm also going to take some very fine emery paper and gently buff out a couple of small scratches on the rim of the brass t-bar filler fitting, as I suspect a slightly raised edge may have scratched one/ both of the old seals during the filling process.

Any comments/ advice?

S510 .177 with AGS 3-9x40 (illuminated), S200 .177 with 10-shot conversion and Simmons 44 Mag 3.8-12x44mm Diamond WA, Webley Xocet .22 with Simmons Deerfield 3-9 x 50, Weihrauch HW45 .177/.22 barrels with Dowling & Rowe red dot, Walther CP88 .177

Offline davmor

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Re: S510 leak/ dumping air
« Reply #15 on: August 20, 2017, 12:54:25 AM »
Late night thought (went to bed/ got back up!):  I don't think it can be either of the two visible rings above/ below the filling port, as I believe they simply seal while filling.  So either it's a leak from the "hidden" seal i mentioned or the valve itself, I think (hadn't been planning to try and strip that - even if it's possible?).  I guess I'll find out in due course...
S510 .177 with AGS 3-9x40 (illuminated), S200 .177 with 10-shot conversion and Simmons 44 Mag 3.8-12x44mm Diamond WA, Webley Xocet .22 with Simmons Deerfield 3-9 x 50, Weihrauch HW45 .177/.22 barrels with Dowling & Rowe red dot, Walther CP88 .177

Online Gambo

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Re: S510 leak/ dumping air
« Reply #16 on: August 20, 2017, 12:38:06 PM »
Yep, replace the small o-ring on the cone shaped plunger down inside the T bar fill adaptor.

The dowty washers very rarely need changing.



Offline IceBlerk

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Re: S510 leak/ dumping air
« Reply #17 on: August 21, 2017, 09:11:49 AM »
Any comments/ advice?

Leave the balloon on the leaky fill valve permanently; it'll look right good!

Offline davmor

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Re: S510 leak/ dumping air
« Reply #18 on: August 21, 2017, 02:29:27 PM »
Leave the balloon on the leaky fill valve permanently; it'll look right good!

Lol!  I did, for a little while - one on the muzzle, another on the fill valve - looks really comical! :)
S510 .177 with AGS 3-9x40 (illuminated), S200 .177 with 10-shot conversion and Simmons 44 Mag 3.8-12x44mm Diamond WA, Webley Xocet .22 with Simmons Deerfield 3-9 x 50, Weihrauch HW45 .177/.22 barrels with Dowling & Rowe red dot, Walther CP88 .177

Offline davmor

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Re: S510 leak/ dumping air
« Reply #19 on: August 21, 2017, 02:39:48 PM »
Thanks for your last post, Gambo - you got it in one!  I  left the upper/ lower (Dowty?) seals in place and just replaced the seal on the fill valve to cylinder thread and the small one on the conical valve body.  Put it all back together and was leaking air around the thread (the replacement seal had seemed slightly loose - same cross section but bigger diameter than the original).  So, took it apart again and replaced the original "thread" seal (so the only new seal was that tiny one on the nose of the conical bit).  Ta - rah!  Cocked the rifle and filled again and it's holding pressure.  Yippee!  Took the opportunity to replace two M3x6 "slotted" screws on the trigger mechanism with hex versions as the originals were badly chewed (I'm not sure if they might originally have been AT and had a slot cut into them by previous owner??).  Anyway, wiped gun down and cleaned with silicone oil and refitted scope - now just need the rain to stop so I can set up zero again.  :)   Thanks to all for comments/ advice.
S510 .177 with AGS 3-9x40 (illuminated), S200 .177 with 10-shot conversion and Simmons 44 Mag 3.8-12x44mm Diamond WA, Webley Xocet .22 with Simmons Deerfield 3-9 x 50, Weihrauch HW45 .177/.22 barrels with Dowling & Rowe red dot, Walther CP88 .177