From: none@none.com99   
      
   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.   
      
   --   
   Bob La Londe   
   CNC Molds N Stuff   
      
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