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Bsa Airsporter Buffer And Tap Loader Which Way Round, Piston O Ring Refit

Discussion in 'Technical' started by nohope, Jun 25, 2020.

  1. nohope

    nohope Member

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    I am servicing a BSA Airsporter Mk6 /GL.

    I refitted everything but it was not discharging every time, piston still seemed to be tight even after cocking it about 100 times so decided try and reassemble with a little more grease, unfortunately I damaged the piston O ring trying to get it in the chamber past the lever slot the second time. so anyway here's my bunch of questions.

    The buffer washer has a bevel/chamfer on one side, should this be fitted pointing forward or back?

    Looking at the Chambers exploded diagram it shows the tap loader in open position with the spring/ball bearing pointing rear. This one was facing forward. When loading a pellet one has to push the pellet in with a matchstick to get over some initial resistance. I changed the tap so the spring/ball bearing faced rear, then loaded a pellet, the pellet went in with no resistance; I was a bit concerned that it might get stuck on the way out, so I did not fire that. I also noted that the tap was much stiffer to fully close, perhaps too stiff. Which way should the tap be?

    Should you lubricate the tap with oil?

    What strategies do you use to insert the piston into the chamber without damaging the piston O ring?

    Sorry lots of Questions.
     
  2. hughwp

    hughwp Busy Member

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    How tight was the o ring? it could be you need a smaller o ring. The standard types that ft t BS210/211/212 Nitrille and can be 50p at a hardware/ auto shop.

    To my knowledge the buffer washer serves no purpose a tap washer would do the job.

    Is the piston head nylon or alloy ?
     
    nohope likes this.
  3. nohope

    nohope Member

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    @hughwp yes O ring was tight, interesting useful source for new seals, but I have already re-ordered. Buffer washer, does the job of buffering, especially the piston pin, I would suppose. Its an alloy piston.
     
  4. hughwp

    hughwp Busy Member

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    Many people cut down the piston and shorten the head to eliminate the buffer washer I fitted a bs 210 designed for meteor and it was still quite tight on one with a nylon head.
    Assemble the head/seal witha little sm50 so it slides freely and avoids damage on assembly
     
  5. flatrajectory

    flatrajectory Posting Addict

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    The tap should be in the closed for firing position when the tap lever is to the rear of the opening ..i.e. the lever is in line with the cylinder and to the rear of the tap . the tap opens in an anti-clockwise direction , and is open for loading when the lever is perpendicular. The pellet hole in the tap is tapered to allow easy loading, so no wonder you had to push the pellets in .!!!!
     
    Phil Collins and nohope like this.
  6. nohope

    nohope Member

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    @flatrajectory ok that's good to know, so it has been fitted incorrectly; so I can get rid of the matchstick!
     
  7. nohope

    nohope Member

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    @hughwp wow those BS rings are cheap, but I can't measure that accurately. I was recommended to get some high content moly grease in another post, so I got some Bisley Gun Grease, have I got the wrong thing?
     
  8. hughwp

    hughwp Busy Member

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    Moly grease like Bisley is fine you just don't want to get too much ahead of the piston o ring on assembly otherwise the gun will diesel SM50 is a high flash point oil designed for compression chambers
     
    nohope likes this.
  9. nohope

    nohope Member

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    @hughwp so I took another look at this, was wondering whether to get a smaller seal, so checked the new and old seals - same size.
    The piston is however very different. The ring is lower on the piston head than the original. Also when the ring is in place the O ring protrudes outwards more, hence why it was so difficult to get in and stiff when in the chamber.

    Pic with original piston on left and one supplied by TW Chambers their part code PW027 on right.
    https://www.instagram.com/p/CB5-dUqB0Av/?utm_source=ig_web_button_share_sheet

    The original piston was messed up, with a ball bearing, I suspect from the Tap, there was a bearing in that a too but looks like same size, and had wrapped the top of the head over the O ring, and also squashing it, I have got to work with a file and does not look to bad, going to loose some pressure with that big dent in it, but can't spend anymore on this.
    Still eagerly waiting for another O ring so I can assemble again.
     
    Last edited: Jun 26, 2020
  10. hughwp

    hughwp Busy Member

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    I would try the meteor o ring bs210 it's a bit smaller than the a/s one.
    Can't see your pic
    These guns are a pain I've just given up on a Mk5 I got in parts as they are not worth spending money on if they are well used
     
    nohope likes this.
  11. nohope

    nohope Member

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    @hughwp BS210 is a thought, link to pic should be there now, this one has been abused then neglected for 20years, its now a lockdown project, Kill Rats!
     
  12. hughwp

    hughwp Busy Member

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    Yes see what you mean if its any use I reduced the diameter of the oring slot from 22 to 21.5mm and the nylon piston from 27.8 to 27.3 (the bearings on the piston were 27.45 the O ring in place (bs210) was about 27.85
     
  13. nohope

    nohope Member

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    large breath out, I don't have the skills or tools for that
     
  14. flatrajectory

    flatrajectory Posting Addict

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    Use the original piston head, you won`t loose any significant compression with the dents. The late Airsporters loose lots more air in the transfer port and loading tap, so that dent will go unnoticed. The piston head you have bought will loose too much compression with the O ring that low down.
    whatever O ring you decide on you must grease it to help insertion, but not too much. It also helps if you twist the piston as you push and wiggle in order to get the O ring past the threads in the cylinder. Once the piston is in the cylinder push it down slowly and use a small screwdriver to press down on the O ring as it reaches the end of the cocking slot. Once past the slot you are home and dry. The piston must pull and push down the comp tube with only a little friction, too much and you will loose power.

    Pete.
     
    nohope likes this.
  15. nohope

    nohope Member

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    ok thanks guys.
    With the original piston the seal went in with no difficulty, just as you said @flatrajectory, (the chambers piston with std ring, was just so wrong); and tap lever is now 180 changed so that rotating bit is the right way round, makes it easier to load.
    Using the original piston and standard O ring is a bit tight, certainly would consider a smaller ring another time, @hughwp.
    Still don't know which way the buffer washer should have gone in with the bevel, but I can't see a purpose to it.

    All back together and shooting well; power up and a tight cluster on target. Now where's those rats.
     
  16. flatrajectory

    flatrajectory Posting Addict

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    Well done you. The buffer can go either way up.
     

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