Page 2 of 2 FirstFirst 12
Results 16 to 23 of 23

Thread: Advice on Park RH93

  1. #16
    Join Date
    Jul 2015
    Location
    swansea
    Posts
    275

    Smile Strip down..

    Before strip down 10 ft lb.

    After strip down, clean, lube and reassembly...4.5 ft lb..

    Looks like I'm going to get more practice taking this apart..

    Will add anything I think might help to the aptly named 'Idiot's guide'.....

    As John said, a spring compressor is vital in order to get the chain to recouple..

  2. #17
    Join Date
    Jul 2015
    Location
    swansea
    Posts
    275

    Strip down..

    And try not to lose any bits on the garage floor !!

  3. #18
    Join Date
    Dec 2003
    Location
    Cambridge UK
    Posts
    7,068
    Hmm, rather sad and I hope you get it sorted.
    Now these comments may be irrelevant to you but I have vague recollections from my past searches for info that:
    The springs used are of different length and spec. And balancing the action such that the two pistons meet at the correct spot at the correct time is crucial. I also seem to recall that someone, somewhere said that two different sets of springs were used and gave the relevant specs and a possible supplier.
    As I say, this may be totally irrelevant and you are fully aware of it all, especially as I have never delved inside a 91 or 93.
    Cheers, and I look forward to your notes,
    Phil

  4. #19
    Join Date
    Dec 2003
    Location
    Cambridge UK
    Posts
    7,068
    Hi , me again
    Your note spurred me on to see if I had any other info and it turns out I do but I am not sure of the origin:

    PARK RH 93 Springs
    Hi, if its any help I have these spring dimensions from my *Park RH 93.*
    They were measured when the gun was nearly brand new and thus can be reasonably used as reference points if the *Park 91* has the same cylinder/action dimensions.

    Short Spring, (pushing front piston rearwards).
    3.9mm wire x 19 coils Weight: 108 grammes.
    Length: 14.8cm Outside Dia:23.3mm. Internal Dia.:15.5mm.

    Long Spring,
    3.3mm wire x 29 coils. Weight:94 grammes.
    Length: 16.3cm Outside Dia.:18.3mm. Internal Dia.:11.6mm

    My gun came with a .22 calibre barrel and I made and fitted a .177 HW barrel to it because the design makes it very easy to swop barrels around.
    The required changes included the probe and O ring.
    The barrel to cylinder seal remained the same.

    AND:
    Hi, I had bought a new spare set (not factory originals) off somebody in the UK many years ago.

    Here are the two sets of dimensions for the standard factory springs as found in the gun and for those supplied as spares later.
    I do not recall the spare springs supplier.

    Standard dimensions as from the factory:
    Short Spring, (pushing front piston towards the stock).
    3.9mm wire x 19 coils Weight: 108 grammes.
    Length: 14.8cm Outside Dia:23.3mm. Internal Dia.:15.5mm.
    Long Spring, (located above trigger).
    3.3mm wire x 29 coils. Weight:94 grammes.
    Length: 16.3cm Outside Dia.:18.3mm. Internal Dia.:11.6mm.


    Dimensions of spare springs supplied by ??.
    Short Spring,(pushing front piston rearwards towards the stock).
    3.8mm wire x 21 coils. Weight: 102 grammes.
    Length: 17.5cm. Outside Dia.:23.4mm. Internal Dia.:16.2mm.
    Long Spring,(located above trigger).
    3.4mm wire x32 coils. Weight: 100 grammes.
    Length: 22cm. Outside Dia:18mm. Internal Dia.:11.2mm.

    The thing to bear in mind is that the unequal strength of the springs is designed to ensure that one piston pulls the other keeping the chain taut preventing snagging. So I suppose that any two springs similar to the dimensions above should work fine.
    ***************

    Apologies for not finding this info earlier,
    Cheers, Phil

  5. #20
    Join Date
    Jul 2015
    Location
    swansea
    Posts
    275
    Thanks Phil.

    Lots of help and advice on here...

    Very grateful !!

  6. #21
    tinbum's Avatar
    tinbum is online now Killer Vampire Lesbians on scooters
    Join Date
    Aug 2007
    Location
    Daarn Saaarf!
    Posts
    19,391
    Thats a short HW80 spring at the front and what looks like a small diameter BSA spring at the rear. The HW30 spring is similar, but almost certainly too weak.
    God rest ye jelly mental men

  7. #22
    Join Date
    Apr 2002
    Location
    Near Wimbledon, SW London, or Lusaka, Zambia
    Posts
    26,325
    Quote Originally Posted by tinbum View Post
    Thats a short HW80 spring at the front and what looks like a small diameter BSA spring at the rear. The HW30 spring is similar, but almost certainly too weak.
    the large spring OD is a good bit larger IIRC ? Doesn't tally with Phil's numbers though...
    Always looking for any cheap, interesting, knackered "project" guns. Thanks, JB.

  8. #23
    Join Date
    Jul 2015
    Location
    swansea
    Posts
    275

    Seals kit/specs ???

    Got it back up to 10 ft lb but it's not so consistent without all the grease that was in it.

    Think I need to do the seals. Does anyone know what the specs for these are please or where I might be able to source them.

    Simon

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •