NPSS "clangs" with every shot
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NPSS "clangs" with every shot
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Topic: NPSS "clangs" with every shot (Read 1625 times))
BmaS
Oh no! I've been demoted to
Sharp Shooter
Posts: 711
Real Name: Sam B
NPSS "clangs" with every shot
«
on:
October 19, 2012, 09:01:11 AM »
My NPSS clangs like a bell with every shot.
I have honed the compression tube, polished the ends of the piston, installed a new seal, polished the inside of the piston and the end of the gas ram (contact points where the two meet), and applied a light coat of moly in the recommended locations. I have stuffed rags and foam rubber into the hollows of the stock. Nothing seems to quiet it down. Another forum member here has suggested that the noise is the piston rebounding from the end of the firing cycle (bouncing off of the end of the compression chamber?) and hammering back into the tip of the rod on the gas ram.
I'm wiling to consider all suggestions on this. The shoots great otherwise, it isn't terribly hold-sensitive, and lighter in weight compared to my other springers. But it is significantly louder than my Titan and my Trail, and if you don't have a headache before you shoot it, you will afterwards!
Can anything be done to eliminate or at least dampen this noise?
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Crosman Titan GP .22 -- GRTIII "Gateway drug"
Reminton NPSS .22 -- CBR "Clang"
Diana 34 T06 .22 (x2) -- TWINS!
Beeman R1 .22 -- "Mein Fraulein"
CCS 2400KT .22 -- "Baby"
Disco .22 w/ BNM -- "Easy"
Custom 2240 -- Hers
Custom 2250 carbine -- Hers
Custom 2240 -- mine
Crosman 1077 "CO2 sucker" -- Hers
Tanfoglio Witness 1911 CO2 BB -- Hers
Daisy 880 (x4)
Daisy 822 (x2)
Daisy 1200 pistol
Daisy 188 pistol
VAFarmer
Sharp Shooter
Posts: 874
Re: NPSS "clangs" with every shot
«
Reply #1 on:
October 19, 2012, 09:17:32 AM »
When you honed, you didnt get it "too smooth" did ya?
What was velocity before, with the same weight pellets?
Did you shim the piston any?
Could try a seal that is slightly larger by a couple thou's, and also make sure the tube has a little bit of "traction" for the edges to grab.
God bless,
Farmer
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yoshi800
Plinker
Posts: 256
Re: NPSS "clangs" with every shot
«
Reply #2 on:
October 19, 2012, 10:43:05 AM »
* edited
Forget I said anything
«
Last Edit: October 19, 2012, 11:11:04 AM by yoshi800
»
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gaia
Fuyukai desu.
gene_sc
Deceased
GTA Senior Contributor
Posts: 8917
GTA A Cut Above The Rest- In God We Trust
Real Name: Gene Co-founder of GTA Forums
Re: NPSS "clangs" with every shot
«
Reply #3 on:
October 19, 2012, 10:58:14 AM »
Yoshi the NPSS is a gas piston and not a springer
Gene
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http://www.charliedatuna.com
South Carolina
THE ONES I SLEEP WITH: HW-97K, Crosman Kantana, CZ-200, Webley/Scott UK Tomahawk, Benji Marauder, Benji Discovery, Remington NPSS .177, Crosman Venom, Crosman RamQuest, Gamo 440, Gamo S1K, Gamo CFX Synthetic, Gamo CFX Royal, RWS 24
yoshi800
Plinker
Posts: 256
Re: NPSS "clangs" with every shot
«
Reply #4 on:
October 19, 2012, 11:13:28 AM »
Hehe It's early here and my brain isn't fully functioning
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gaia
Fuyukai desu.
microsalmo
Sharp Shooter
Posts: 990
Real Name: Steve
Re: NPSS "clangs" with every shot
«
Reply #5 on:
October 19, 2012, 11:57:18 PM »
Sam, mine does just like yours does and is a marvelous performer. Clanged before and after the tune... shoots 14.3 in the 730 fps range and groups very tight out to 50 yards with BFTS.
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Tampa Bay, FL
YouTube's AEAC
ivanpros
Marksman
Posts: 305
yes
Re: NPSS "clangs" with every shot
«
Reply #6 on:
October 20, 2012, 01:18:13 AM »
Same here, sounds like a tuning fork after every shot; seems normal to me, but I do think about what that will do to the scope.
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Southern California
.177 HWS30S (Vortek PG2 9ft/lbs)
.177 TX200 MKIII (Tuned w Vortek PG2 12fpe)
.177 Benjamin Discovery (Mac1 tuned w TKO)
.22 Remington NPSS Camo (Shadow Tuned)
gene_sc
Deceased
GTA Senior Contributor
Posts: 8917
GTA A Cut Above The Rest- In God We Trust
Real Name: Gene Co-founder of GTA Forums
Re: NPSS "clangs" with every shot
«
Reply #7 on:
October 20, 2012, 01:55:49 AM »
I have to say I have owned 4 NPSS's and tuned them myself and they all had a fantastic cocking and shooting cycle. No Tuning fork here...
I still own one and enjoy shooting it ever chance I get. One of the best USA made break barrels around.
Gene
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http://www.charliedatuna.com
South Carolina
THE ONES I SLEEP WITH: HW-97K, Crosman Kantana, CZ-200, Webley/Scott UK Tomahawk, Benji Marauder, Benji Discovery, Remington NPSS .177, Crosman Venom, Crosman RamQuest, Gamo 440, Gamo S1K, Gamo CFX Synthetic, Gamo CFX Royal, RWS 24
BmaS
Oh no! I've been demoted to
Sharp Shooter
Posts: 711
Real Name: Sam B
Re: NPSS "clangs" with every shot
«
Reply #8 on:
October 20, 2012, 08:12:03 PM »
I agree that it is probably the best USA break barrel sold in recent years.
I haven't shot across the crony lately. I think that it was getting better than 700 with 14.66 H&N FTT pellets before I ever took it apart the first time.
I don't know if I got it "too smooth", not sure what that would be actually.
I opened up the action and de-greased everything again. I smoothed the inside of the skirt of the piston, and the outside of the main body of the gas ram. I also polished the outside of the piston with 400 grit sand paper. I had previously honed the compression chamber with an automotive brake cylinder hone, so I left that area alone, other than to clean and dry. I gave all possible "seal eater" edges of the compression tube a good de-burring with a jewelers file, and polished (with 600 grit wrapped around a dowel rod) the back half of the tube. I applied a light coat of JM-moly on every surface that I thought might be making metal-to-metal contact. I re-assembled, paying careful attention to the piston seal as it went in. (Almost forgot to mention, it has the special Gene_SC brass washers in the pivot, with light coat of JM-moly there.)
I am still hearing some grinding when I cock it, and it still clangs (though perhaps a little less than before) with every shot.
I need to chrony it. Mine is a .22, and I have fed it mostly 14.66 H&N FTT and 18.1 JSB Diablo pellets. It is accurate and it hits hard. I took two squirrels with it today @ 25 yds.
Logged
Crosman Titan GP .22 -- GRTIII "Gateway drug"
Reminton NPSS .22 -- CBR "Clang"
Diana 34 T06 .22 (x2) -- TWINS!
Beeman R1 .22 -- "Mein Fraulein"
CCS 2400KT .22 -- "Baby"
Disco .22 w/ BNM -- "Easy"
Custom 2240 -- Hers
Custom 2250 carbine -- Hers
Custom 2240 -- mine
Crosman 1077 "CO2 sucker" -- Hers
Tanfoglio Witness 1911 CO2 BB -- Hers
Daisy 880 (x4)
Daisy 822 (x2)
Daisy 1200 pistol
Daisy 188 pistol
thekid
GTA Senior Contributor
Posts: 4019
Re: NPSS "clangs" with every shot
«
Reply #9 on:
October 20, 2012, 08:40:53 PM »
Sam,
I would scuff the piston up in the direction of travel in the area's you polished them.
A smooth surface wipes clean, then the grinding returns. (A little moly on the inside of the receiver, where the back of the piston is forced against the compression tube ( scope rail side)) Courtesy (PP) and areas scuffed.
«
Last Edit: October 20, 2012, 08:43:56 PM by thekid
»
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uncle paulie
GTA Moderator
GTA Senior Contributor
Posts: 4014
Real Name: Paul
Re: NPSS "clangs" with every shot
«
Reply #10 on:
October 21, 2012, 11:37:54 AM »
You may want to try to isolate the cocking linkage, it remains "loose" after cocking and firing and can vibrate with the shot cycle. The piston and the other internals all have some friction on them after the cycle which would tend to eliminate subsequent vibration, similar to putting your hand on a bell when struck.
pv
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NJ
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NPSS "clangs" with every shot