FT Piston seal life.

[Cross Pistol Packer]

Need to get me one of those pistons & a few cups,looks like a winning combination 1377x

[hotshot]

My last seal deteriorated rapidly when my solid pin worked loose without me realising might put some thread lock either end.

[Cross Pistol Packer]

I put some thread lock on my brass M4 nuts as same happens,they work loose....

[1377x]

i used a wrench to tighten my brass  acorn nuts.they havent worked loose but did bend my tube slightly
i couldnt get my piston out until i spread the ends apart

[Cross Pistol Packer]

I changed the acorn nuts for M4 brass full nuts,so could see threads and know when nut loosend off,also found some very thin brass washers for nuts to lock on to.

[1377x]

do they still loosen?

[quickster47 †]

1377x, is that an old 760 piston you show in your picture?

I'm going to order one or six tomorrow if they are still available.

Carl

[1377x]

1377x, is that an old 760 piston you show in your picture?

I'm going to order one or six tomorrow if they are still available.

Carl

sure is
760/140/130
the difference between the 760 and 130/140 is length of the steel part of the piston

[Cross Pistol Packer]

do they still loosen?

little beggers stay put now

[BassManNate]

Are these still available? If so, what are the part numbers? I tried looking at some old Crosman 130 parts diagrams and think I found what I need but there are several things on there that say "obsolete" or "order part ### instead"

[1377x]

1377x, is that an old 760 piston you show in your picture?

I'm going to order one or six tomorrow if they are still available.

Carl

you know now that i think about it there is another style of 760 piston
its steel with the nowadays cup.i tried one them and it really needs to be adjustable to work in a 1377

[quickster47 †]

you know now that i think about it there is another style of 760 piston
its steel with the nowadays cup.i tried one them and it really needs to be adjustable to work in a 1377

The original one was either plastic or Delrin or some other type of composite material and that is the one in your picture and the one I am after.

Carl

[1377x]

The original one was either plastic or Delrin or some other type of composite material and that is the one in your picture and the one I am after.

Carl

yep
the ones in the pics above are the first oldstyle 760 piston.the 130/140 has the same style piston head
the other style piston is this one below.it takes the pump cup used now

[NorthStaR]

I think 90 durometer urethane may work well, Tim at Mac1 Airguns uses these for just about every kind of seal he puts in a gun. Those combined with some of his "Secret Sauce" should last for a long long time I would think.

Great O-rings! Hardcore last forever rings!

[1377x]

i think all the piston makers use 90 durometer orings these days!
i know ac and mellon do!