Wednesday, August 6, 2008

Benjamin 317 Rifle Disassembly, Part 4

Now to pull the valve...

The valve is pulled!

The inlet valve spring, washer and the exhaust valve spring.

The exhaust valve, lead seal. The lead seal has an alignment ear that I don't see on the replacement seals offered on gunbroker. Probably doesn't need it. I dug out some lead sheeting and will just make an earless one.

The exhaust valve seal & stem. The rubber seal has extruded around the valve stem. I'm assuming that's not how it should be.

The inlet valve, inner side. I had to push the pump a couple of times to get it to break free.

The inlet valve seal. It also has extruded to fit into the inlet valve hole. Again I'm assuming that's not correct? Both the inlet and exhaust look like the edges are rolled over to retain the seal. I need to do some dissection...

All the valve parts.

The exhaust valve seal really looks bad. Notice the hardened piece pressed into the top of the stem that is contacted by the hammer.

I now have to do the following:
1) clean everything
2) find out whether anything else comes out of th valve assembly.
3) make a lead seal
4) make a new exhaust seal
5) make a new inlet seal.
6) put the whole thing back together and test.



Anonymous said...


After all this, I'm almost tempted to dig into the Crosman 147 one more time and see if I can fix her.

I said, "almost".

I still think fixing 30+ year-old multi-pump pneumatics is more voodoo-witchcraft than mechanics.

Great pics, by the way.


Anonymous said...

Thanks for this! I just got a Benjamin Franklin rifle from my grandfather that passed and it is not holding air, your tutorial was very helpful to take it apart, im kind of confused on where the actual seal is, can i make one? Mine looks exactly the same it was very hard to find out the model # is a 317 because all mine says on the side is H257532, awesome information though and pics

Felice Luftschein said...

Glad to help, you can get seals from Bryan and Associates and other places on the net.


Jim Sharp said...

where does one get one of those pull tools?

Nick Carter said...

Baker airguns, (check and see if they have different models), they took over for Bryan and Assoc.