From: Snag_one@msn.com   
      
   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 ...   
   --   
   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)