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Bsa Airsporter - Sear Wont Engage.

Discussion in 'Technical' started by Nick in NZ, Jan 30, 2020.

  1. Nick in NZ

    Nick in NZ Member

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    066A733C-3531-4DEB-B4BF-85EF678C0E96.jpeg I’ve inherited my father in laws Mk6 Airsporter. The piston was pretty much seized, so decided to give it a service using a kit from Chambers. I have reassembled with new spring, piston, etc - but now the sear won’t engage when I’m cocking it. It is as if the part which ‘rocks’ back that the sear engages on is not quite going far enough. If I use my finger I can click the sear in to place. Any suggestions gratefully received :)
     
  2. SlugFest

    SlugFest Busy Member

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    I was going to say it sounds like the sear has already engaged during reassembly and you need to manually unset it before cocking..... but it's also possible the new spring is just a fraction too long and is compressing without allowing full travel?
     
    Nick in NZ likes this.
  3. Ade C

    Ade C Busy Member

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    Most simple starting point is back off the trigger adjustment screw
     
    Nick in NZ and Trampilot like this.
  4. Patrick

    Patrick Donator

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    The new spring you put in have checked to see that it's not coil bound before the piston rod engages with the sear and also check to make sure there is sufficient tension on the trigger pressure/tension spring because if it doesn't have sufficient tension on it the sears wont hold.
     
    Nick in NZ and Figgy like this.
  5. ggggr

    ggggr Crap old gun tinkerer and wine maker

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    Firstly--was it cocking before you did it?
    Next--remove the trigger block, mainspring and piston. Then --try pushing the piston rod into the trigger block. If the sear doesnt engage then you need to look at the sear and trigger.
    If it does engage--then it suggests that the piston is not able to come back far enough for the rod to engage in the sear. The chances are it is either colibound or the face of the piston (the cocking slot) has elongated and needs welding up.

    Put the piston back in the cylinder but without the mainspring in and replace the trigger block. If you cock the gun and it engages, then it sounds like it is coil bound.
    If it doesnt engage, but you can push the piston back with a rod (Or remove the cocking arm so you can slide the piston back with a rod or screwdriver) and it engages--then that suggests the cocking slot in the piston elongated or maybe the face of the cocking arm worn. Hightly unlikely that the cocking arm is bent.
    Please let us know how you get on.
    This stuff should go in the collectable section i reckon as a few like to see stuff like this.
    Good luck
     
    Nick in NZ likes this.
  6. Trampilot

    Trampilot Keyboard Hero

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    This - the last Mercury I did I had to adjust the trigger because I was using a stronger/newer mainspring.
     
    Nick in NZ likes this.
  7. Nick in NZ

    Nick in NZ Member

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    Thank you for all the suggestions I will work through them this weekend and let you know how I get on. By the way, what is ‘coil bound’? Thanks again
     
  8. ggggr

    ggggr Crap old gun tinkerer and wine maker

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    "Coil bound" is when there is too much spring in the gun and the coils all close up to each other with no gaps (so you are then more or less trying to compress a sold piece of metal) ---------------and the piston cannot move back any further.
     
    pjbingham and Nick in NZ like this.
  9. Nick in NZ

    Nick in NZ Member

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    A5D95718-F9BD-452A-AC8C-D0552BA4F7EA.jpeg I have removed the spring and the sear now engages when cocked - so possibly is coil bound? This is the difference in spring length - should I shorten the new spring to the length of the old? Many thanks
     
  10. Nick in NZ

    Nick in NZ Member

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  11. Nick in NZ

    Nick in NZ Member

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    Sign of me getting old. I still think of Airsporters as being the business, rather than collectable. Then I realise it was from 40 years ago when I was younger (a lot) with a BSA Meteor and an Airsporter was a dream gun.
     
    Gat Man likes this.
  12. mrtho

    mrtho Engaging Member

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    The problem may be being caused by the greater width of the flange on the new spring guide plus the width of the top hat flange.

    I would suggest reassembling without the top hat and with the original spring guide as both springs have the same number of coils.

    If the gun cocks successfully when done then try it with the new spring guide,but without the top hat as a process of elimination.
     
    Nick in NZ likes this.
  13. ggggr

    ggggr Crap old gun tinkerer and wine maker

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    Well at least you have eliminated most of the trigger problems (although it could still be adjustment).
    I know it is a pain doing these things----BUT:rolleyes: Try putting your new mainspring in without the top hat and guide--and then try it. ALSO inspect and take a pic of the piston cockng slot and put it on here.
    If the thing is coilbound, there is a good chance that leaving the top hat and guide out will reslult in the gun cocking---------in which case you then shorten the spring a little bit.
    If the gun does not cock with the top hat and guide left out, that would suggest a worn cocking slot on the piston.
     
    Nick in NZ likes this.
  14. Trampilot

    Trampilot Keyboard Hero

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    That reminds me - I did have to shorten the after market guide I got for the Mercury because it was clashing with the top hat. So yes try that first before shortening anything.
     
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  15. Patrick

    Patrick Donator

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    The spring in the kit may not be an OE(original equipment) spring) and may be for example a Titan made spring. Titan springs are not model specific, they are a range of springs made to cover a whole variety of different airguns and the one in your kit is designed to be used in guns other than the Airsporter. Titan springs use a number for each spring in their range and if you look at that number,it may be a No 10 for example, it will say what guns that spring is intended for and for some guns it will be a straightforward replacement but for another gun even thought it's listed for it it may require removing a coil or two and flattening and reshaping the end of the spring where the coil(s) have been removed.
     
    Last edited: Feb 1, 2020
    Nick in NZ likes this.
  16. Nick in NZ

    Nick in NZ Member

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    Argh, it goes from bad to worse ☹️ Before I started working on it the rifle would cock and fire. I have tried combinations as suggested, but even putting in the original spring and will not get the gun to cock now! When the guide moves over the top of the trigger mechanism the mechanism is not moving up to latch on and hold the guide. Even pushing the guide in by hand, the trigger won’t engage. Is the trigger activated to latch on by the movement of the spring guide on a part of the trigger, or is the trigger action spring loaded to latch as the guide moves in to the block? When cocking the lever comes to a ‘hard stop’ as if I’m at the full extent of movement. I’m starting to think something has ‘happened’ to the trigger??
     
  17. Nick in NZ

    Nick in NZ Member

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    You can see in this photo that the ‘catch’ has moved over the top of the trigger, but the trigger action has not moved up to engage. 1A2DC4ED-5D1C-40B1-82E2-7F5E8CCCDB57.png
     
  18. mrtho

    mrtho Engaging Member

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    Can you cock the action with your finger ie push the upper sear upwards and get the sears to engage and hold?If you can pulling the trigger will 'fire' the trigger mech which means all is ok at least with the mech.
     
    Nick in NZ likes this.
  19. Nick in NZ

    Nick in NZ Member

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    Yes, I can engage the action by pushing it up with my finger, then it holds and releases with the trigger.
     
  20. mrtho

    mrtho Engaging Member

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    Ok so nothing then is wrong with the trigger mech,but do check when cocked that there is good sear engagement this can be adjusted via a grub screw on the underside of the trigger block just forward of the trigger guard.

    The other things to check are the condition of the piston cocking slot where the cocking 'foot' engages and the condition of the piston rod sear.Maybe you could supply pics for evaluation?
     
    Last edited: Feb 2, 2020
    Nick in NZ likes this.

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