Author Topic: Puzzle solved  (Read 963 times)

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Offline Baggawind

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Puzzle solved
« on: March 10, 2015, 05:12:31 PM »
I,ve been playing around with my homebuild recently. The one I fitted with a Weihrauch barrel. I had it running at just under 11fpe - nice. Today I thought i,d do some long range testing. Checked the zero at 35 yards - ok. Went back to 50 and check my aim points. One group of 7 shots went into 10mm. Lovely. I took a break for coffee and a wad then continued. Well, the next string went one mildot low. Whaaat. The next went even lower. Oh bollocks I must have a leak. Came home and tested for power. 9.5 fpe. Must be a leak. So filled her up and tested . 10.5fpe. Then tested it every 45 minutes. Still 10.5.  :o So, I stripped the top end and checked for leaks. None. I went to my record book and checked fill pressures etc.. Then I noticed the hammer stroke length - 10mm. Went back and checked the stroke. 12.5 mm. The adjusting screw had slowly been working itself in, increasing the stroke. This was allowing the hammer to hit the valve body. So I adjusted it back to 10mm. and locked the bugger with studlock. Result ? a very consistent 11.5fpe. Now I have to reset the zero all over again. Bloody airguns.

Offline Gambo

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Re: Puzzle solved
« Reply #1 on: March 11, 2015, 08:35:36 AM »
Bloody airguns indeed! ::)

It can be very frustrating, and at the same time very satisfying, to investigate, find and fix a problem.

Been there a millions times before, and as like will be going back a million times in the future too. ;D