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Cometa 300s fettling job

Discussion in 'Anything Airgun Related' started by Jackroadkill, Jan 3, 2014.

  1. Jackroadkill

    Jackroadkill Donator

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    Collected a friend's Cometa 300s today so that I can fix it up and tune it for him. When I arrived at his house, he gave me the rifle and said that it wouldn't cock. Oh dear, I thought.

    Here are some pictures of what I found:

    Working parts all caked in a mixture of old lithium grease and muck:

    [​IMG]

    Barrel rusty under the moderator:

    [​IMG]

    More grease / muck:

    [​IMG]

    Piston seal is burned by dieseling, and had to be chucked as it was brittle and studded with swarf:

    [​IMG]

    The first indication of why the rifle wasn't cocking!:

    [​IMG]

    And confirmation:

    [​IMG]

    The whole thing was swimming in old grease, grit and swarf. That said, I think I can rescue the old girl with a bit of TLC, a new piston seal, breech seal and a WW tuning kit.

    I'll update as I progress through the rebuild.
     
  2. Andy_J

    Andy_J Replica Airgun Enthusiast

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    Look forward to seeing this progress. Nice one Jack.
     
  3. bhodge

    bhodge Keyboard Hero

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    Good one, nice to see something 'different' getting the once over... I've never seen a Cometa in bits before!
     
  4. Jackroadkill

    Jackroadkill Donator

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    Makes a change from the usual, I suppose. What is interesting is the construction of the rifle; all the parts bar the cylinder / barrel assembly and the piston are just pressings - even the cocking link. I suppose maybe there is something in the argument that Weihrauch, Air Arms et al produce a higher quality rifle pound for pound.

    Still, we shall see what can be done with her.
     
  5. Jackroadkill

    Jackroadkill Donator

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    Right, so after a thorough clean-up, deburring, polishing and seal-replacement job I fitted the WW kit (thanks Will), lubed it all up and put it all back together. Surprisingly, it all felt very good, and the shot cycle was smooth and very predictable.

    My friend picked it up this morning, took it home, shot it and rang me to tell me it was like a new rifle, so I'm glad he's happy.

    Maybe you can polish a turd after all.
     
  6. bhodge

    bhodge Keyboard Hero

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    :) :)...or, at least "roll it in glitter"
    (been waiting to use that line for ages).
     
  7. JD

    JD Donator

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    Turning out to be a skilled airgun tuner Jack, nice one mate.
     
  8. Patrick

    Patrick Donator

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    He's obviously a man who lavishes a lot of care on his air rifle!! :D
     
  9. Jackroadkill

    Jackroadkill Donator

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    Well, to be fair it was in a hell of a mess when he bought it (from a well-known local bodger / cowboy at an eyewateringly expensive rate). Nevertheless, as you're getting at, a bit of a clean wouldn't have hurt.
     
  10. Jackroadkill

    Jackroadkill Donator

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    Oh, I forgot to mention; the grub screws that were holding the moderator onto the barrel had been overtightened so the internal threads had stripped, hence the mod being loose. They were beyond redemption, so I drilled and tapped some new ones and did them up to a suitable torque with a bit of Loctite for good measure.
     
  11. JD

    JD Donator

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    Now you've tuned and fettled a Cometa 300, whats your thoughts on this rifle, being a entry level lowish priced airgun.
     

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