From: Snag_one@msn.com   
      
   On 5/10/2025 6:59 PM, Bob La Londe wrote:   
   > On 5/10/2025 4:17 PM, Snag wrote:   
   >> On 5/10/2025 6:00 PM, Bob La Londe wrote:   
   >>> On 5/10/2025 3:53 PM, Bob La Londe wrote:   
   >>>> On 5/10/2025 3:24 PM, Snag wrote:   
   >>>>>    Today at the yard sale I picked up a Crosman "American Classic"   
   >>>>> model 1377 for ten bucks . It doesn't pump , and I think it's   
   >>>>> probably the cup on the pump . Part is available for a few bucks   
   >>>>> and I'm wondering if I should replace the rest of the seals and   
   >>>>> o-rings too . Is there anything in there that I wouldn't have in a   
   >>>>> box of assorted o-rings ? I've also seen "big bore" sleeves for the   
   >>>>> barrel/ pump connection , looks like something an enterprising old   
   >>>>> fart with a machine shop could duplicate ...   
   >>>>>    BTW , this pistol has the rotating sleeve instead of a bolt ,   
   >>>>> cocks by pulling on a knob on the back end of the pump sleeve . I   
   >>>>> have no idea how old it is but it doesn't look exactly like the   
   >>>>> current model .   
   >>>>   
   >>>> I resealed a 1st generation Model 1 in .22 I think they use the same   
   >>>> plenum and knock valve.  My son might have his grandads 1377.  Hold   
   >>>> on. Let me go look in his gun safe.  I think they all have similar   
   >>>> internals.   
   >>>>   
   >>>> Would you have the seals?  Its been a while since I had my Model 1   
   >>>> apart.  I don't recall.  I seem to think there might have been   
   >>>> something different, but its not hard to take apart and look.  I   
   >>>> think there are even some videos on YouTube doing it.  Got a cup   
   >>>> with a lid or a zip lock bag to keep things in?  Take it apart and   
   >>>> look.   
   >>>>   
   >>>> Yes, you should replace the seals and o-rings.   
   >>>>   
   >>>> The cup is probably bad, but probably so are the seals on the plenum   
   >>>> and knock valve.  Works just like a PCP except it has a tiny little   
   >>>> air reservoir.  A spring loaded "hammer" slams into a pin opening   
   >>>> the air valve and dumping air into the barrel.   
   >>>>   
   >>>>  >> I've also seen "big bore" sleeves for the barrel/pump connection ,   
   >>>>  >> looks like something an enterprising old fart with a machine shop   
   >>>>  >> could duplicate ...   
   >>>>   
   >>>> I have not seen that, but you absolutely could.  Things have to have   
   >>>> as good of a finish as a hydraulic cylinder, but its possible.   
   >>>>   
   >>>> The problem with a large volume pump is that I don't think you gain   
   >>>> any power after a certain point.  Instead the air valve closes again   
   >>>> without releasing all the air.  In fact you can potentially get less   
   >>>> power if you over pressure the plenum because its harder for the   
   >>>> hammer to open the valve.  That's kind of how an unregulated PCP   
   >>>> works in fact.  By taking advantage of that principle.  Anyway if   
   >>>> you have the arm strength to spare it might pump to optimum charge   
   >>>> with fewer pumps.  Or maybe I don't know what you are referring to.   
   >>>>   
   >>>> You can get more power out of a multi pump pneumatic if you increase   
   >>>> the strength of the hammer spring and/or enlarge the plenum.  Then   
   >>>> more pumps or larger pump "might" be give more usable power as long   
   >>>> as the plenum will hold it.   
   >>>>   
   >>>> I just looked.  The one my son got from his grandad is a 2100, but I   
   >>>> think they have almost the same guts.   
   >>>>   
   >>>>   
   >>>   
   >>> OH! DUH! Pistol. LOL. Sorry if some of my comments don't quite match   
   >>> up. The principles are all the same.   
   >>>   
   >>   
   >>    I understand what you're saying . The larger part I was referring   
   >> to is the small sleeve between the barrel and the air reservoir . I'll   
   >> take it apart before I order any parts ... it doesn't look all that   
   >> complicated .   
   >>    Are they worth a few bucks in parts ? I bought it mostly because   
   >> it's a Crosman and they're known for quality . And I didn't have an   
   >> air pistol ...   
   >   
   > There are (or used to be) some guys who bought up junk and parted it   
   > out, but they made a business of it.  On an individual basis I think you   
   > can get what you put into it out of it once you have it working, or   
   > maybe a little more if its still pretty.   
   >   
   > Does it have wood or plastic furniture?  I think they were already   
   > plastic when I was a kid.  I knew a guy who shot birds with the 1377 out   
   > at the McElhaney feed lots.  I'm pretty sure his was plastic.   
   >   
      
      Plastic furniture . I did a little search and found out how to date   
   these . Mine was produced in June 1989 . I'll get it torn down at my   
   first chance , see what it needs . I can afford to spend a few bucks for   
   parts . I generally keep any kind of projectile weapon , never know what   
   you'll need !   
   --   
   Snag   
   We live in a time where intelligent people   
   are being silenced so that   
   stupid people won't be offended.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)