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Advice Ive Got A Dilemma

Discussion in 'Anything Airgun Related' started by Curlyhunter.22, Aug 13, 2019 at 7:24 PM.

  1. Curlyhunter.22

    Curlyhunter.22 Active Member

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    Ive recently got a theoben fenman in .20 flavour.

    I have tried many pellets through it,
    But im not getting grouping at 25 meters plus.

    I have held a shot it many ways thinking it could be hold sensitive to no avail.

    Tried a different scope.

    Cleaning the barrel worked a bit but not much.

    It has the vortek silencer on but its not clipping pellets on the way out.

    What to do?

    Has anyone got a strip down guide for one please?

    CC
     
    Chopper Guernsey likes this.
  2. Super-20

    Super-20 Engaging Member

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    Not my work you'll have to thank @robs5230 for the guide below :thumb:


     
    robs5230 and allanthomas66 like this.
  3. robs5230

    robs5230 леший

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    I hope the stripdown guide is of use.
    They're a funny rifle in that triggers can be heavy / stiff, not least due to the amount of pressure the sears hold. They can gum up with old grease. Simply degreasing and relubing can help trigger function. Obviously poor trigegr function will impair accuracy.

    Do you know the history of the rifle ?
    Many have had leaks and had air added. This starts the degradation of the piston crown / seal.

    If power is low, find / cure the cause of the leak, don't just add air.

    They can be harsh and innacurate if someone has added excess pressure to raise power. They should perform well at 11ftlb in .22 and 10.5 in .177.

    Good luck, Rob
     
    Blackmax and Super-20 like this.
  4. Curlyhunter.22

    Curlyhunter.22 Active Member

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    I have stripped and polished the trigger sears all ready as like you said trigger pull was harsh on the ?gamo? Trigger unit.
    (Why not use rekord or CD units) its a 100% better with a steady 1st stage and a crisp 2nd stage now.

    Ftlb when i got it was 12.2ftlb so lowered it to much down to 9.4ftlb then topped it back upto 11.1 ftlb and has stayed there for 3 weeks now (tested with mk4 chrombo) yesterday. 13/8/19.

    The gun is a 2007 theoben fenman profile in a cs800 walnut stock.
    I have seen and got a photo of the info from previous owner.

    I have read tonight that daystate designed some pellets strictly for walter barrels, daystate range masters around this year 2007-8 has anyone maybe got a couple a dozen i can try please?

    Could it be a burnt out piston seal?

    I love the gun and dont want to give up on it yet and i wouldnt feel happy selling it on knowing what it groups like its a collectors gun at the moment is how i feel.

    CC
     
  5. Curlyhunter.22

    Curlyhunter.22 Active Member

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  6. squib

    squib Busy Member

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    Think i’d Chrono it for consistency before having it apart. Shoot some groups with the chrono on.
     
  7. Blackmax

    Blackmax Forum Rude Guy

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    The gun actually looks like an Evo?

    The trigger unit is an evolution of a Webley design, the Gamo was used in the early Rapids.

    Personally I wouldn't have touched the sears, if you go too far it's nit like a Rekord, you'll never get parts.

    The Rekord or CD wouldn't work as they latch on a piston rod, the Fenman latches on the outside of the piston.

    It could well be the piston seal, well worth changing that and the breach seal. Chris Whister at Impact AKA Selective Arms has spares.
     
    robs5230 likes this.
  8. robs5230

    robs5230 леший

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    Nice looking rifle. Later model with the scope grooves in the cylinder. Basically an Evo with a short barrel

    They shoot very differently to springers. You need to get used to it and accustom yourself to the shot cycle.

    But... if it seems overly harsh / slammy, I'd suspect piston seal especially as power was high when you got it.

    Before you dive into it, I'd try H&N FTT, and Crosman Accupel and maybe JSB RS.
    Different pellets will change how it shoots.

    Proceed with a strip down very carefully. Though easy, it may contain some "odd" parts. They seemed to change components frequently during model ranges and were ina constant state of R&D. Photograph all parts and don't assume you can buy a generic seal kit.

    My advice is if you're anything less than certain you're able to do this, contact Chris Whister at Impact who will be able to service it for you.
    Impact will also have all the parts you need to rebuild.
     
    Blackmax likes this.
  9. robs5230

    robs5230 леший

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    It can be difficult to determine consistency on these.
    The speed at which they are cocked can change the power.
    Cocking action needs to be very consistent.
     
  10. Curlyhunter.22

    Curlyhunter.22 Active Member

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    Cheers guys... will do as advised later with findings.

    CC
     
  11. Curlyhunter.22

    Curlyhunter.22 Active Member

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    Right...
    String of 15 shoots... highest 11.23ftlbs lowest 11.06
    Tried to cock it the same each time. Grouping the same 3/4- 1 inch at 30 meters.

    If it was the piston seal i would get more fluctuaion in ftlb readings wouldnt i ?

    Ill get onto impact to get a breech and piston seal.
    Ive tried hnn ftt thats what groups best so far jsbs and bisley pests plus weihrauch ft dont group at all...

    The previous owner had asked theoben in 2010 about the gun given them the serial no so they could check their records and they sent him confirmation of what it is

    CC
     
  12. robs5230

    robs5230 леший

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    Its difficult to peg without actually shooting it. They have a really "snappy" shot cycle. It should produce a sort of "thonk" when shot.
    If you feel its slammy (and it really shouldn't be with FTT as they're a tight pellet), then maybe a seal replacement is needed.
    The piston seals are poor when new and far too hard and not very pliable. If its had some hammer they "burn" easily.
    WHether a strip and reseal is in order is really a toss of the coin
    But I'd say those power levels and fluctuation are about right from a rammer.

    The earlier fenman with a smaller diameter piston, shot better.
    Yours is basically an Evo with a short barrel.
    Looks like you're sticking with FTT. They're not the easiest of rifles to shoot but after some getting to know it, I'd say the groups will improve.
    I'd also give the barrel a good pull through and get 50-100 FTT through it to re lead it up.

    When I did mine which the strip and rebuild was based on, I found that many weird and wonderful bits inside, I was gobsmacked. Without the help of the very knowledgeable ex Theoben lads who were then still with Impact, it would have been a nightmare.

    It looks a fine rifle and in very good order. I'd advise getting in touch with Chris Whistler at Impact and let him service it.
    You then have good provenence its been done properly and it will add to the investment and resale price.
     
    Scott likes this.
  13. Curlyhunter.22

    Curlyhunter.22 Active Member

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    It is as you say a 'thonk' i wouldnt call it 'slammy'.

    Thats probably the best idea... ill try to contact him somehow.

    Its not getting sold... ive wanted one since i was an 11 year old when i first shot one.
    It will be sorted...

    'maybe a spring conversion'

    Thank you for all your coments and advice

    CC
     

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