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Question Hatsan 60s dieselling?

Discussion in 'Anything Airgun Related' started by tomsteebs, Jul 13, 2014.

  1. tomsteebs

    tomsteebs Donator

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    Just stripped and smoothened my 60s and it sprays a fine mist out, but doesn't diesel. Any ideals what this is? I've cleaned the barrel? Also what do I need to touch the crown up?
     
  2. mattyts

    mattyts Donator

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    what lube did you use? if it's none combustible it will just spray out.

    ideally for the crown you would need a lathe but since that's probably not possible,a ball bearing glued on a golf tee,chucked into a drill with some grinding paste will do,or a diamond coated abrasive taper.
     
  3. tomsteebs

    tomsteebs Donator

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    Hi,

    Red rubber on spring, moly g cote on sides of piston seal, lt2 on piston body, sm50 on cocking arm lever groove on piston and dri slide on top hat guide and back half of cylinder.

    Think that's right, it shoots way better and no twang, just this spray, I would guess it's Sri slide?

    I have a wood lathe with a Chuck so could use that,
     
    Last edited: Jul 13, 2014
  4. Pete E

    Pete E Engaging Member

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    Unless you have a problem with the crown, I personally would not mess. Not sure about air rifles, but its easy to b****r up the accuracy on a centre fire with a poor crown job.
     
  5. mattyts

    mattyts Donator

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    You need a metal lathe with a slide,wood lathes aren't accurate enough.

    A dome headed bolt can also be used,you just need to keep it perfectly centered hence why I mentioned a lathe.

    Give it another 500 shots and see if it's still spraying out.
     
  6. Greg1983

    Greg1983 Busy Member

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    I re-crowned my gun other day, took me all of 2mins using wet and dry and a drill bit and it passed cotton bud test first try and shoots straight and accurate :) also it was my first time doing a re-crown.

    The tool:
    [​IMG]

    End result:
    [​IMG]
    Bit of wet and dry and a few twist of a phumb and its done :D
    Cheers, Greg.
     
    Last edited: Jul 13, 2014
  7. Akita177

    Akita177 The Absolute State of Britian podcast

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    On some days you can get what looks like a water vapour blast coming out the barrel and nothing to worry about.
    If it was the moly on the piston seal i would have thought you would smell the diesiling.
     
  8. lone wolf

    lone wolf Pro Poster

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    TThat's interesting Greg as im looking at carbining my hatsan and wondered if a countersink bit would be suitable.

    Best go find it!
    TThanks for sharing
    Gaz
     
  9. Greg1983

    Greg1983 Busy Member

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    Your welcome :)
    I didn't have access to a lathe so I was going to use the old pencil tip and wet n dry method then whilst digging through the tool box I had that and thought it may work and it did! It was that good I did my other rifle also :D just remember to test it after with a cotton bud q tip.

    Cheers, Greg.
     
  10. stevemandm

    stevemandm Honorary Member

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    in a distant galaxy, far far away ....... actually
    tom, fire the hatsan over the chrono to see whether its dieselling or not - also, take into account that any 'contaminents' fired out of the barrel may interfere with readings. if the power is constant, and in limit, then it wont be dieselling, and the 'contaminent' will run out. also remember that any dispersion of contaminents will be greatly magnified/exaggerated by the initial blast.
    as for re-crowning, what makes you think that it needs doing ? if it needs doing, the only way to do it correctly, and first time, is on a metal lathe - where the bore and face is clocked up true, and the chamfer is traversed, as opposed to formed/plunged.
    if the above method works, then great, but there is plenty of room for operator error (no offence to greg, as he appears to have done a great job).
    also, the optimum crown angle is 22 degrees inclusive (11 degrees parralel from the barrel). a crown may look good (and pass the cotton bud test), but it needs to be perfectly concentric to the bore to enable equal dispertion of the pellet gas in the propulsion process.
    sorry for the essay, its just the engineer (and not the shooter) in me !
     
  11. tomsteebs

    tomsteebs Donator

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    I thought that to be honest, I tried to keep any lube from being in front of the piston seal.
    It was very damp when I shot it and to be honest I shot it this afternoon and it seemed not to be there.

    I'm surprised what a difference a re-lube and de-burr etc... Made
     

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