GTA
General Discussion To Gateway To Airguns => The Shop => : fnash February 01, 2008, 04:18:19 PM
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I just finished tuning my Remington Summit. I replaced the spring with a Mcarri spring. I had it on hand for awhile and just got around to doing it. I was surprised at the stock spring I found. It was the same length as a stock B3 spring and same diameter. It was also bent. Does anyone know if the spring in this condition tells us anything? Would an accidental dry fire cause this? I now have a nice Summit that shoot well over 900 fps. And consistent. I also think it is more accurate now, don't seem to wonder around as much.. Any info on the spring would be welcome... Thanks... FN
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I'm no expert on these things, but a spring that is canted like that could gall the insides of the reciever and make a "screendoor spring" sound when you cock the gun. Again I'm no expert, but I would think loose fitting spring guides would do that as well as possibly some detonation of oils in the air chamber.....not so sure about the dry firing doing that, but I doubt it would help:) Best off to replace it, and if possible with tighter fitting guides, or if not available possibly the "shrinkwrap" guide treatment. Use only quality lubes and tars like the Macarri products, and keep that stuff out of the compression chamber. I pulled a spring out of a cheapo Chinese Fast Deer that looked like that and the gun was definately detonating prior to teardown, at dusk you could see a visible flame about 4" long come out the end of the barrel when it was shot. I'm sure someone with a little more expertise will chime in shortly. Happy tuning!
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Dano is pretty much on the button. When a spring looks like that, it is usually caused by one or two things or a combination of both. Detonation and/or heavy pellets. A good sign that the lube is getting past a bad seal (or a tube that is pretty badly out of round or damaged with scored lines. Loose guides contribute to the extent of the damage allowing more cant.
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The story on this is that it was a replacement by Crosman on a Summit which broke the spring. I ordered a spring from Mcarri thinking I would replace it myself but then decided to send it back to Crosman. They replaced the rifle into the original stock. It has a different serial number than the original purchase. A few days ago I decided to make use of the Mcarri spring and glad that I did.. It shoots better now. Maybe after a spell I will check the spring and see if it is doing OK... FN
One last note is that I was surprised that the spring I removed looked like nothing more that a stock B3 spring, of course the Mcarri spring is longer by about an inch.....
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If the Maccari spring was not set or has not already been placed in a gun and cocked, it will be about 12 inchs long but once it is set, it should be about 10 1/2 inches long give or take an eighth of an inch or so. In the Remington it might be a little differnt though. I don't know how long an undamaged set B-3 spring is.
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You know I did forget about a spring being set and would be shorter.. so I guess it was an ok spring and something went wrong to cause that condition. As it was shooting in the 800, but now in the 900's... It's an easy gun to take apart so will check it when I think about it down the road.. and Charlie I want to take time to thank you for all your information you have on your web site . I did print out the instructions for the B18/19. I had it apart before but always helps to recheck information like this.... Thanks,,, FN
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Thanks Frank. Glad to see that the info was helpful.