Sunday, August 21, 2011

A Few Notes On the V-350

I reassembled the V-350 with a new o-ring but reused the other two seals
08121101
I decided to sand the rust out of the barrel.

08121102
Still splotchy…I kept at it.

08121103
At least the lettering is still intact.

08121104
Barrel and tube were reblued with Van’s cold blue.

08121105
I still don’t completely understand the gun. But this pop valve feeds the BBs into the barrel from the flat and channel above.

08121106
Fed.

08121107
I had to debur the end of the barrel. I found that the BBs were shooting out at a 45 degree angle – there was a dent at the end diverting them. I wish I’d noticed it when I had the barrel in the lathe…

I had to disassemble it again though as it was only doing 175fps and it should be doing 350fps (hence the V-350).

08121108
The manual said to use thread sealant on the barrel threads, so I uses some teflon tape. The spring seems canted (sorry, no pic.) which could also be part of the problem, more so if it’s also become a bit relaxed. But I reassembled it and it’s now shooting between 185 and 240 fps. That’s an annoyingly large spread of velocities which was compounded by the fact that I think the chronograph has a hard time seeing BBs on a sunny day. I received many of the dreaded Shooting Chrony “ERR” messages. To further muddy the waters it seems as though trigger release plays a large part – which means that things are dragging on other things in an unpredictable way.

So I’ll have to think about things. Spring, seals and more smoothening seem in order. Unfortunately I’m not sure what to do about the first two. I might preload the spring a little, if there’s room. We’ll see.

Well Derrick's been posting up a storm, so I messed with it a bit more...

I made a spacer for the spring.


The spacer adds about .2" of thickness...So I put it back together again and found almost no
change in velocity. At least I figured out that the lenses of the Chrony were dirty - cleaning them helped getting better readings. This leaves it at the seals or some other unknown problem. I'll have to think on it for a while. It may still be that the spring is too weak but it does seem as strong as it should be for a non leveraged cocking gun.

3 comments:

Nicholas Weaver said...

For nostalgia reasons (my uncle taught me to shoot a BB gun with his V350 when I was a kid, and I realize its a great airgun for teaching since small kids CAN'T cock it on their own!) I'm looking to pick up one of these for myself.

How did you find yours?

Felice Luftschein said...

I honestly can't remember where I got it, only that it was cheap due to the condition. They appear often on Gunbroker and you can always post a Want to But (WTB) post on the yellow airgun forum classifieds.

Eddie H Sills said...

I just rebuilt my V350 that I bought new in 1992...

I got a seal kit which includes the pop valve & spring, O-ring, Teflon seal,main spring & oil from:

https://www.bakerairguns.com/product/crosman-v-350-v-3500-seal-kits/

Baker also has other parts...

The main spring in it is 3" longer than my original spring which would explain why mine did not shoot very well...