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Tinkering With My Hw97k

Discussion in 'Technical' started by N.Vodden, Dec 4, 2019.

  1. N.Vodden

    N.Vodden Engaging Member

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    Hi all :)

    I was out shooting on the weekend and @Artfull-Bodger kindly let me try his HW97 which he has done a lot of work on and it was stunning to shoot.

    My friend's one as well has been fettled and feels much nicer to shoot so when I went back to my stock 97 and it went BOINGGGG I thought right, let's sort this out!

    I haven't ordered any parts for it but I thought the thing could at least benefit from a strip and clean. I've never taken a springer apart before but I watched plenty of guides and read some very helpful threads on here so armed with the tools, I set to it.


    Before...

    20191204_184113.jpg


    After...

    20191204_184035.jpg


    I will admit - at this stage, I was thinking "What have you done?!" :rofl:

    It was easy enough to strip, the only real sticking points being the rear block which did NOT want to unscrew. I had the body clamped in a WorkMate with a spanner wrapped in cloth in the slot, and it took a worrying amount of force to get moving but once it gave way it came out easy enough.

    First impressions on stripping, no wonder it felt a bit 'grindy' to cock. The piston and cylinder were practically dry, almost no lube whatsoever. I know you don't need to use much but there was hardly any on there. The spring on the other hand was covered in a thick and almost dried gunk. Did not look right at all.

    Gave it all a thorough wipe down, degrease and clean. The spring looks like one of the good ones from what I've seen described on here. Circular cross section, not squared and the ends are flattened and filed.


    20191204_194915.jpg


    The stock spring guide was very loose and falls out of the spring in the end it was fitted to, but at the other end it has a tighter fit and stays put so I fitted it that way around to hopefully keep the spring central and take some play out of it.

    The spring was very loose in the piston as well and rattled around a lot, so I made a sleeve from a beer can in true bodge job fashion. It's a good excuse to knock back a few Oranjeboom - "But I need the empty cans dear...honest!" :roflmao:

    Here is the fit, before the sleeve was cut to size and the end 'tabs' bent over to be held in place by the washer. Much better with less play, yet still able to move and expand freely as it compresses.


    20191204_194949.jpg

    I reassembled it with a thin layer of moly grease on the piston and seal edges, the spring, a dab on the spring guide end plate and a very thin layer on the outside of the cylinder to ease it's movement inside the rifle body.

    Reassembly was easy and the only tricky bit was the pins when remounting the trigger unit. A little tricky to align but once it was all lined up they went in with a few light taps. I mounted the action back in the stock and snugged everything back up. It was dark by the time I finished it but I headed out the garden to pop a few pellets off.

    It cocked and locked back correctly (phew!!) and wow, it feels as smooth as glass compared to how it was before. I loaded a pellet, took her off safe and CRACK - significantly less twang!

    I only put about 10 pellets through it because it's a bit late, dark and a residential area. It's not the quietest gun so didn't want to disturb anyone but oh my what an improvement. It cocks easier and smoother, shoots sharper and the twang is significantly reduced. Enough to not be an issue now.

    All in all it took about 1.5 hours to do and wasn't too difficult, and now I've had the 97 in bits I've got no qualms whatsoever about doing work on it myself now. If you have the slightest bit of mechanical ability you won't struggle.

    The only thing I haven't done is chrono it. It was doing 10.9 ftlb consistently before this, I doubt a clean and lube would add over a full ftlb but I will check it to be sure of course.

    Well worth the effort to strip, clean and tinker. Looking forward to getting it zeroed back in and running some lead through it to bed back in and see what she can do.
     
  2. Gary Jones

    Gary Jones Big Poster

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    Well done mate. The jobs a good'un :up:

    You'll be looking for project guns now you've popped your cherry :up:
     
    Reevo17 and greyskull like this.
  3. N.Vodden

    N.Vodden Engaging Member

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    Heh, got a battered old Westlake B2 I bought in my teens nearly 20 years ago gathering dust in the cupboard ;)
     
    Gary Jones likes this.
  4. rich79

    rich79 Lovin the smell of cordite in the morning

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    I picked up a 177 KT secondhand earlier this year, first owner hardly used it & it looks brand new, was doing 10.2 over the chrono but it might be bedding in!
    I'm undecided what to do with it, home fettle like my 77 & what you've done or tbt/vortek it or 22mm it's guts.
     
  5. The Squire

    The Squire Engaging Member

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    Good work, nothing to hold you back now from further tinkering!
     
  6. Reevo17

    Reevo17 Big Poster

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    Well done and they’re one of the trickier ones to start in too!

    I have a short stroke on my 77 - stunning but I’m now considering a paul short titanium or nick gibney 22mm!
     
    Tyler durdon likes this.
  7. Tyler durdon

    Tyler durdon Posting Addict

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    Get the 22mm
     
  8. rich79

    rich79 Lovin the smell of cordite in the morning

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    I heard something about a 20mm somewhere! Might wait to see if it's true & & how people rate it.
     
  9. Tyler durdon

    Tyler durdon Posting Addict

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    Not sure about 20mm , 21 maybe, I tried a tx in 21mm and was superb. I have a 77 in 22mm
     
  10. N.Vodden

    N.Vodden Engaging Member

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    What are the advantages of the 22mm or smaller kits, what improvements do they offer?
     
  11. Tyler durdon

    Tyler durdon Posting Addict

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    They are more efficient. Lighter internals. Lock time is super fast . 6DB5D44F-810E-4536-A040-3BA85D8608A3.png
    That’s my 22mm internals/piston is around 120 grams , a stock piston is around 270 .
     
  12. N.Vodden

    N.Vodden Engaging Member

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    Ahh I see, thanks for the information!
     
    rusty cogs likes this.
  13. N.Vodden

    N.Vodden Engaging Member

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    Managed to get a short break in the weather this afternoon so I put 2 x 10 shot strings over the chrono.

    With an 8.4gn pellet (AA.Diabolo Field) the average from both strings was the same at 239ms. That's 784.1fps which comes to 11.47 ftlb.

    The highest speed was 241ms which was only one pellet out of the 20 and that works out at just over 11.6 ftlb so I'd say its averaging around 11.5 and it has picked up about half a foot pound from a clean and lube.

    It still does have a slight twang, nowhere near how it was before but still not quite gone. What do you think is the simplest and cheapest option to try to eliminate it - quality tophat and spring guide?
     
    Reevo17 likes this.
  14. Tyler durdon

    Tyler durdon Posting Addict

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    Yes makes a big difference
     
  15. rabbitcatcher

    rabbitcatcher Engaging Member

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    what spring you using Tyler?looks a long one mate.
     
  16. Tyler durdon

    Tyler durdon Posting Addict

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    Titan no12 yes I know what your saying pal !
    This is all the work of nick gibney and it’s very good to ! I will post a full review of the performance when I have the tyro stock fitted as it’s my open sight rifle . So far it’s very impressive.
     
    rabbitcatcher likes this.
  17. rabbitcatcher

    rabbitcatcher Engaging Member

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    well I got a titan 13,its at 30 coils-down from 36.Going to use it in my 177 hw95 to power a titanium piston I have as a trial.Needs plenty of spring/pre load to lessen bounce.See how it goes when I try it in new year!
     
    Tyler durdon and Reevo17 like this.
  18. Tyler durdon

    Tyler durdon Posting Addict

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    That sounds very interesting!!
    The 22mm speed in the 77 is shocking such a light weight piston. I haven’t had much time to test yet , but here are some groups with open sights , mix of standing unsupported and rested 5 shots each 17 m 3F842C3B-4AA6-4523-9CA8-C3594A010490.jpeg 46E4B08B-E844-415F-8C8E-E05565170438.jpeg
     
    Reevo17 likes this.
  19. rabbitcatcher

    rabbitcatcher Engaging Member

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    Decent groups from that position.Wonder if with light pistons the barrel may prefer light pellets for best performance.
     
  20. Tyler durdon

    Tyler durdon Posting Addict

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    A mix of 7.3 /7.8 /8.4 , I’ve yet to put a scope on it so we will see
     
    rabbitcatcher likes this.

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