Slavia 624, looking for info or parts

leojlafrog

leojlafrog

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I recently picked up a Slavia 624 that wouldn't shoot a pellet through the barrel. Upon disassembly, I found that the piston is cracked and broken and the piston seal had come off and was stuck in the chamber.

I picked it up cause I thought it was just going to be a worn leather seal. Is there any hope of finding another piston and making myself some new seals? With some online looking, I've found a place in the UK that may have a new piston but no seal to go with it.

Taking a close look at the receiver/chamber (not sure on what to call it) it has a scratch for the entire length where the broken piston has been riding/running during it's stroke.

Any ideas or suggestions? I'm thinking of looking for parts or another Slavia that I may be able to make two out of.

Thanks, Joel
 
Probably the best fix is going to be to make a new piston. The gouge in the chamber is going to chew up any seal that you put in there, regardless of whether you can get it to seal or not.

Get a coarse brake cylinder hone and polish the gouge out of the chamber with a drill. Make sure you do the whole length of the chamber. Brake cylinder hones are about 20 bucks.

If you're lucky and its not too deep, you MAY be able to use the old piston. I'm not sure about the 24, but the older 618/619 seals are easy to replace with a homemade leather seal.

You'll need a spade drill about the size of the piston. Drill a hole through a piece of wood. Soak a piece of thick (3/16 thicknedd works good) leather in water overnight, and place it over the hole. Take a socket (wrench) and hammer it gently in, pushing the leather into a cup shape about 1/4 inch deep. It should fit tightly. Let this sit for a couple days to dry.

In the meantime, you can drill and tap the end of the piston to accept a machine screw. Number 8 or 10 is a good size.

When your new cup seal is dry, trim with a knife so it is round. You can use a belt sander to get it good and flat on the cup end. Drill or punch a hole big enough for your machine screw in the center, and with a washer, screw it on to the end of the piston with the cup facing foreward (away from the piston). Give it a good soak with silicone oil, and reassemble.

The reason you might need a new piston is that the cup seal may fold backward over the end of the piston if there is too much clearance between the piston and chamber walls.
 
You can try these guys for parts, maybe they will have something or know of someone who does.

http://scopesandammo.com/storefront/

http://www.dlairgun.com/
 
The 624 I just bought has a synthetic seal. You can likely source one in Europe. Should have measured it when it was apart. A chap jb welded his cracked piston in a 620, with decent results.
 
I'm not entirely sure i'd trust JB weld. The 620 is a 300fps airgun, the spring is about as big around as your little finger, and the piston is hollow tubing. The 624 is a whole different beast.
 
As stated by mwjones the brake cylinder hone is a good start. You may want to allow the stones to build up with crud so they don't cut so deeply but polish. To do this spray a little lube in the chamber and on the hone (wd 40 is fine), work the stones in and out as the drill rotates to create a 'x' pattern of scratches. As you do this from time to time give another spray of lube. As the scratch begins to disappear stop adding lube and allow the stones to 'load up' with material. Don't be alarmed if you can't get the scratch all the way out. With a plastic seal it is critical to have a near perfect bore but with a leather cup seal it is not so critical. The reason being that a plastic seal relies on a knife edge to seal but a leather one has more side contact with the chamber bore and thus a greater capacity to seal.
 
Crocus cloth on a sawn 1 " slit end wise on some 3/8 hardwood dowel and a cordless drill will iron out the scars..........
 
mwjones said:
I'm not entirely sure i'd trust JB weld. The 620 is a 300fps airgun, the spring is about as big around as your little finger, and the piston is hollow tubing. The 624 is a whole different beast.
Click to expand...


620 and 624 are the same rifle. Stock a little longer on the 624, 630 and 631 are the full size
 
Thanks for the tips. I've decided to do the rebuild. Haven't done any real work to it but I have reshaped the piston back into shape and round and waiting on a friend that is going to take a try at welding or brazing the crack in the piston. It's pretty thin but he'll let me know if he can do something with it. If not, my brother has a machinist friend that likes to do odd ball projects like this, so he might be able to make me a fancy shmancy new one if need be. I've got my brake cylinder hone but haven't got around to working the chamber yet. Should come out cleanly.
 
How is the rebuild coming along? I sold two little slavias, actually traded them for a ruger kids airrifle, big big mistake as the ruger is 1/2 the gun. Fortunately a friend found me a new in box 624 for $40. Grabbed it fast before any minds were changed.
 
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