Re: Bob La Londe , I got an airgun question

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 .

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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.
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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.
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Yes, you should replace the seals and o-rings.
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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.
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 >> 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 ...
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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.
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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.
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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.
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I just looked.  The one my son got from his grandad is a 2100, but I think they have almost the same guts.
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OH! DUH! Pistol. LOL. Sorry if some of my comments don't quite match up. The principles are all the same.
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   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
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