40 Year Old Benjamin 342 Reseal

Forums Springers, Pumpers, C02, & Replicas 40 Year Old Benjamin 342 Reseal

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    Polyphemus21
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    I rebuilt my 40 year old Benjamin 342 this weekend.  It was originally my Brother's, now passed away.  The seals had long since expired and ot would barely hold pressure.  I know he had used 3 in 1 machine oil to lube it and that likely had killed the seals.  I ordered a seal kit and a replacement trigger guard on EBay from Palmer's Pursuit Shop-he had it all including the crucial valve removal and installation tool.

    With a little time spent on cleanup and getting organized I had perhaps three hours invested.  The gun had a lot of grease that needed to be cleaned out of the pump chamber and valve chambers.  That took some scrubbing with detergent and a 12 guage shotgun swab.  Afterwards I blew it out with air and then swabbed with cleaning patches to make sure it was dry.

    The tougest part of the project was getting the front checkvalve ito drop in the right direction with the rubber face towards front.  Also getting the valve stack back in with the two solder washers against the spring pressure of the two springs was a little tricky.  It took perhaps ten trys but eventually things dropped into place and tightened up.

    Now, six pumps will yield around 680fps and groups around an inch with the open sights that came on the rifle.  That is the best my eyes can accomplish.  It was very gratifying to see this old classic work like new again!

    This was not a difficult project and Inwould encourage anyone that has one of these great old pumpers on need of repairs to give it a try.

     

     

     

     

     

     

     

     

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    crittahitta
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    Nice looking gun. Thats really cool that it was your brothers. Was it always a brass color or did you clean off the bluing/paint? Have fun with it. Oh if your eyes are getting bad like mine put a scope on it. I bet that thing is super accurate with one.

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    Stefanjan
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    Sweet.  I got an old crosman 101 waiting for a reseal.  I was going to tackle it myself but decided to send it in as Im just not sure I could do it.  

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    Polyphemus21
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    The paint was mostly rubbed off by the time I salvaged it.  I just used some scotchbrite to shine it up.

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    JohnL57
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    Nice save! The threaded valve guns like your Benji and the Sheridans are a little tricky to reassemble. I got a sliver of brass in the valve while rebuilding and had to take apart and reassemble my model C. Something I was told is to re-tighten the valve nut after shooting the gun a bit, then you're good till the next reseal.

    Good going!

    John 

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    spysir
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    Nice rig, always loved most of the crosman and benjamin pump rigs of days gone by.

    I may be wrong but I believe they were not "painted" ( we all know what you mean)  but a complicated ( and too toxic for todays standards) coating process.  Chatted with a fellow who owns the ( maybe?) largest Benjamin collection in the South who had all kinds of detailed interesting information on these pieces of History.

     

     JohnL  brings up a valid tip from back when they were new.   If that rifle was repaired under warranty the smith would have gone to all the trouble of this important step in a rebuild/repair. Then he could be sure that unless abused he likely would never see that rig again.

     

     OP,

    Have to put you in the "airgun friend" ( ugh ) list. Your post makes me miss my old 342 so much I now feel I " need " an old pumper.

    Mine had some odd wood the factory just grabbed from a wood pile.

     

      Hope you still get to shoot that one 40 years from now.

     

    John

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    ahnlaashock
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    I have a 342 that needs seals.  If it had a breech that would hold a scope properly, it would have already been fixed.  I am way too old for open sights.  

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    JohnL57
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    ahnlaashock

    I have a 342 that needs seals.  If it had a breech that would hold a scope properly, it would have already been fixed.  I am way too old for open sights.  

    I hear that! I rarely shoot my Sheridan for that reason. Don't know if I should mention this but the new Chinese made wood and steel Diana dragonfly comes with milled scope grooves. It also has a magazine which would make loading with a scope much easier.

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    Polyphemus21
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    Right.  I am going to go back into it and snug up the valve after maybe fifty shots.  I may tap the rear of the "receiver" for a peep sight.  I am 59 and it is really hard to see the sights and the target at the same time.

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    Polyphemus21
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    That is a great looking old Benjamin!  My first pumper was one of the Montgomery Wards Crosman 760's.  It shot pellets and BBs and I will never know how they made the so accurate for a smoothbore.  I grew up next to a big Filbert orchard and we had a lot of China Pheasants that would roost in there in the evenings.  That Crosman got me a lot of pheasants (Hey, nobody told me you had to use a shotgun) ?  It put a lot of meat on the table over the years until I finally received a real shotgun.  Good times!

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    Jon86
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    Hi new to the forum.  NicBenjamin. My buddy had his Dad's, don't remember the model, but it was a Crosman pump, guessing around early 50's. I bought a Sheridan in 2010, not the same quality as I  remember in the 70's, but works. I have a Benjamin 132 , I bought in 82 .  Needs a seal job. DIY job or did you send it out? Thanks n keep on pumping. 

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    Polyphemus21
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    Mine was DYI.  I lucked out as it had the later valve with the bored through transfer port.  That one is easier in and out because any position is good as long as you get it into the bore.  Took about three hours including cleaning.

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