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Piston Seal

Discussion in 'Anything Airgun Related' started by Lydford, Aug 12, 2018.

  1. Lydford

    Lydford Post Whore

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    Help please.

    Had a spot of dieseling with my HW50S (HW99S) and I enclose photo of the seal. I reckon it needs replacing but thought I would seek your opinion first before shelling out £14 .

    Also, I'm pretty old school when it comes to lube and have used molly for fifty years. I believe there are now superior lubes and again I would be grateful for any suggestions.

    Much obliged ... IMG_20180812_151027.jpg
     
  2. robs5230

    robs5230 Big Poster

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    Looks shafted .
    Anything burnt that brown will be quite hard and brittle.

    As for lube, moly's fine, just dont get it on the seal or the new one will be the same after 50 shots. No need to lube a new seal unless its been sized. All that happens is the lube gets scraped forward and combusts
     
  3. TORNADOS7

    TORNADOS7 Big Poster

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    Hmmm, certainly looking a bit worse for wear I’ll give it that, the choice is yours...

    Moly pretty much covers it... :thumb:
     
  4. mikeyhall1

    mikeyhall1 Top Poster

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    It’s not the worst I’ve seen but whilst it’s out I’d replace it. Maybe the breech seal too.

    Molly is still fine. Spray degreaser into the action and ram in some kitchen paper on a stick to clean out any old lube.

    My fav molly is TbT’s bum slide.

    TbT by far do the genuine HW seals the cheapest so might be worth getting all from there.

    @Tinbum is your man for all things TbT
     
    Tinbum likes this.
  5. shauny

    shauny Pro Poster

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    nothing wrong with grease with a high moly content.
     
  6. Lydford

    Lydford Post Whore

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    Thanks everyone . I will get one from Tinbum. I fitted one of his kits some years ago. Nice chap .
     
    Tinbum likes this.
  7. Tinbum

    Tinbum Donator

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    Thanks, I've replied to your pm. £10.95 with free AGF postage:)
     
    mikeyhall1 likes this.
  8. Lydford

    Lydford Post Whore

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    Excellent. Thank you sir.
     
    Tinbum likes this.
  9. Bruno27

    Bruno27 Engaging Member

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    Amazed to see tp marks. Anything to do with various stages of tuning?
     
    john79 likes this.
  10. john79

    john79 Post Whore

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    look's like its been slamming into the end of the comp tube?
     
    cooper_dan likes this.
  11. Lydford

    Lydford Post Whore

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    No, just dieseling I'm afraid ...
     
  12. SteveO

    SteveO Organ Donator

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    Why do these HW seals suffer with the transfer port hole damage all the time? Is it a burr on the hole or is it supposed to slam into the cylinder face like this causing this damage? pretty much every HW I've seen has this damage. :shrug:

    The only seal that I've used that doesn't do it is the Aussie Red seals from Custom Air Seals AU.

    Must be the concave seal face - I love these seals. :up:

    https://www.ebay.co.uk/itm/WEIHRAUC...m=151487440843&_trksid=p2047675.c100005.m1851
     
  13. shauny

    shauny Pro Poster

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    some of the hw seals are ok but of late,im finding them (a lot anyway) too loose.this will make em slam
    and leave witness marks on the seal.as you say,the red aussie seals have a concave face,and if a bit of
    slamming :eek: did occur,the sides of the seal would come into contact first,so you would not get the witness marks.
    also had these marks on reasonably well fitting seals.a little bit of raised swarf around the tp can cut into seal,
    so worth a look if you getting these marks and sorting.
     
    SteveO likes this.

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