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From: Snag <Snag_one@msn.com>
Newsgroups: rec.crafts.metalworking
Subject: Re: Bob La Londe , I got an airgun question
Date: Sat, 10 May 2025 19:54:55 -0500
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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.