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Question Rust On A 6 Month Old Piston

Discussion in 'Anything Airgun Related' started by Daveoc33, Apr 21, 2019.

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  1. Daveoc33

    Daveoc33 Engaging Member

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    I took apart my Hw99s again today as after doing the galling fix it still feels a bit gritty when being cocked. I got the piston out and it's got rust on it. It's only 6 months old. The only place it doesn't have rust is where I applied the moly that came with the tbt kit I installed. There's also rust inside the cylinder where the piston has been sat. So now I have to repolish the piston and apply moly to the whole thing. But how do I get inside the cylinder to clean that? What tools/products do you think work best? I've seen people use steel wool for external work but I'm worried that will leave an abrasive dust in the cylinder that will be no good for the seal.
     

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  2. Bunny-on-Bunny

    Bunny-on-Bunny Posting Addict

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    I can't comment on how to remove the corrosion in the cylinder.
    Before re- assembly worked on parts should be cleaned with meths or parafin and dried... use a good torch to look downtown 'ole, if you see crud, wash it again.
     
    Daveoc33 likes this.
  3. rich79

    rich79 No deep or funny comment here

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    Is there no way of killing it chemically? Other than that wrap a bit of steel wool on a 15mm dowel rod, you'd have to really go at it to do any damage with that.
     
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  4. telephonepete

    telephonepete Donator

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    You need to take a good look at the way you treat and store your rifle. You could try 0000 grade wire wool a pad on a bit of dowel pushed and rotated in the cylinder and then a good blast with wd40 and then dry it.I would then try some lightly greased kitchen towel on the dowel to pick up any bits of wire wool. Then degrease with a good bit of dry towel and after checking with a torch you should be ok. I rarely use degreaser these days.
    Ps better stored in an open envirenment rather than enclosed in a case which does not allow the free flow of air. This in your situation was probably the cause of the corrosion.
     
    Last edited: Apr 21, 2019
  5. PhatMan

    PhatMan Keyboard Hero

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    Daveoc33,

    As Rich79 & Pete say, some 0000 steel wool with oil is a good first place to start.

    If the 0000 steel wool fails, try some green Scotchbrite - cut a slot in some dowel, and cut a 1" slice off the Scotchbrite, insert into slot, and roll until diameter is slightly greater than the cylinder. Cut off excess.

    Put dowel in hand-drill, oil Scotchbrite well, insert into cylinder and rotate while moving slowly up and down the affected region.

    This should remove any stubborn rust.

    Have fun & a good Easter :)

    Best regards

    Russ
     
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  6. Daveoc33

    Daveoc33 Engaging Member

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    What confuses me is this rifle has been outside once. Otherwise its been kept in the study in a hard case and used in indoor ranges. The only thing I can think of is the buffing head I used to polish the piston was damp because it seems to have started at the piston and spread to the cylinder.
     
  7. hairyarms

    hairyarms .

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    Condensation can cause that mate. Coming out of the cold into the warm.
     
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  8. Daveoc33

    Daveoc33 Engaging Member

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    Wouldn't that happen on the whole rifle though, rather than just the piston and the bits next to it?
     
  9. telephonepete

    telephonepete Donator

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    You could lightly grease all of your piston and then wipe it of with a dry cloth. That wont do any harm. The same with the inside of the cylinder. A light layer of grease and i mean light behind the piston will do no harm and will prevent it from happening. In fact vmach recomend this.
     
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  10. Daveoc33

    Daveoc33 Engaging Member

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    Thanks so much for advice guys. I really appreciate it! I'll get the supplies ordered and get started.
     
  11. shauny

    shauny Top Poster

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    have you been keeping it in your fishtank!
     
  12. Samobaggins

    Samobaggins I own to many fx rifles

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    Is your study cold or damp? Plus most people wipe down the outside of their rifle before it’s stored. Why not put a pack of vp90 in your hard case to stop it happening again.
     
  13. Daveoc33

    Daveoc33 Engaging Member

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    It looks like it doesn't it! I was horrified when I got it out.
     
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  14. Daveoc33

    Daveoc33 Engaging Member

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    That's a good idea. I think I will with this rifle. The study is not cold or damp and it has all my other guns in there too. All the other guns are completely fine. It's not the hard case either as it used to have a different rifle in it for longer than the 99 and that one is still as new. The only thing that has rusted is one bit of a rifle that I removed and p****d about with. This is why I think I've done something stupid here.
     
  15. hairyarms

    hairyarms .

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    I don't know why that is mate. You should be able to clean it up though it doesn't sound too bad.
     
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  16. Air arms boy

    Air arms boy Wear sunscreen!

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    Always coat the entire piston with moly don’t listen to less is best Also nice amount of moly inside action (rocol:thumb:)
     
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  17. Samobaggins

    Samobaggins I own to many fx rifles

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    When you polished it you took away any protection put on there when assembled. Wipe it over with a rag with light oil on then wipe it over with a dry cloth so only a trace amount is on the piston.
     
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  18. Bunny-on-Bunny

    Bunny-on-Bunny Posting Addict

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    For the super thin coating of moly or oil, rub a small amount into a clean rag then wipe the parts.
    Wear gloves too, bare hands sweat and it's possible to get corrosion under protective coatings.
     
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  19. Daveoc33

    Daveoc33 Engaging Member

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    Cheers. Yes I'll be extra careful when I redo that piston :)
     
  20. paulairgun

    paulairgun Keyboard Hero

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    Same as above. Was advised this years ago by a gunsmith. Such a light covering you can't even see it, just lightly put on with a artists brush
     
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