Saturday, September 10, 2011

Crosman Powermatic 500 Disassembly, Part 3

On I go…
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The barrel and magazine just popped out. I’m not sure whether that’s a good or a bad thing. The barrels seems to have been bulged to be a press fit in the valve assembly.
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Did I mention it was rusty?
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The roll pin that holds the front sight and barrel plug thingy in.
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I punched out the pin.
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And gently tapped the piece out using a chopstick as a drift. Bamboo chopsticks are wonderful tools.
09081143It was difficult to slide the barrel out – The shroud was dented so I had to massage it with some pliers.
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This die cast part is formed around the barrel. It allows the sight to be screwed in as well as helping align things.
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There’s a notch for the magazine to pass through.
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No seriously, it’s rusty.
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I removed the piercing pin retaining nut.
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All the piercing parts. Looks like another Crosman 38 style assembly.
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The leftmost washer was stepped on the underside.
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The valve stem is rusty…
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The seal is completely gone.
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The BB shuttle?I’m guessing this is actuated by that flat piece in the left side of the action.
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The shuttle.
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That plastic piece covers the magnet (presumably for BB feeding).
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You can see bits of steel fuzz on it.
So now I have to clean the damn thing and see if I can even get it to cycle, much less work. Not particularly optimistic given my failures of late. But we’ll see.

Friday, September 9, 2011

Crosman Powermatic 500 Disassembly, Part 2

On I go…
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I removed the CO2 clamp & screw.
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One screw on the other receiver half.
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Notice how corroded the screw is…
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This freed up the valve assembly. One spring was unhooked.
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The valve assembly with barrel and magazine attached.
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It’s important to take pictures of how spring hooks are oriented.
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Everything is rusty.
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The trigger group.
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It’s somewhat interesting and different.
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This piece pivots on that pin.
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Let’s take more pictures. It will help.
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You know it hasn’t been shot when it has cobwebs.
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The grease has dried out completely.
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I punched out the one, longer, pin.
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Interesting spacers.
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I tried to remove the shorter pin but it seems swaged – best to leave it. I can clean around it.
More to come…

Thursday, September 8, 2011

Crosman Powermatic 500 Disassembly, Part 1

Having hit a velocity wall with the V-350 I decided that a slight change of pace was in order. So I dug a Crosman Powermatic 500 out of my pile of airguns.09081101
Not a bad looking rifle, with the same lines as most other Crosman air rifles of the era.
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It has an inline BB magazine above the barrel.
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There’s a bit of corrosion.
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Power Matic 500
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More corrosion. This isn’t inspiring confidence.
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This is where the CO2 cartridge goes, The plastic plate which hides it is missing.
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As is one forestock screw.
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Time to begin by removing the buttstock.
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The stock is really heavy. I believe that this is a Croswood stock.
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Removing the one remaining forearm screw.
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The knurled CO2 nut needs to come off.
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I clamped the nut in the vise to get the punch started on the roll pin and then removed it so I could rotate it 90 degrees to fully tap it out.
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Notice that the forearm isn’t lightweight like a plastic part – it only has enough material removed for the parts to fit in.
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The “barrel” band holds the shoud to the stock.
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I removed three screws.
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And carefully separated the halves. Nothing shot across the room, which is always a good thing.
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As you can see the innards are corroded and full of cobwebs.
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I took a bunch of views to make reassembly easier.
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Notice that the safety is missing.
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Another view…
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Not really that complex although I’m unsure how the mechanism works.
More to come…