Friday, October 6, 2017

Daisy 881 Quick Fix

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I pulled the check valve and pump cup from a donor 880 that seemed in good condition. All o-rings were replaced.
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That weird hard plastic or rubber buffer makes no sense to me.
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Some more detail on the barrel clamp, I found the barrel wiggled a bit, which means that air was leaking past the seal.
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Forgot to take a picture, but I ended up lapping the bottom of the clamp w/sandpaper on a flat plate until it made better contact.
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The gun wouldn’t hold more than one pump of air after reassembly, which meant that the check valve wasn’t working. So I decided to experiment and heated it and a round bushing up with a heat gun until they were moderately warm/hot. Then I compressed the seal (making the skirt flare out more) with the arbor press and held it until it cooled.
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As you can see, the seal on the left has taken a set and is larger in diameter than the non-working seal on the right. I don’t know how long this will last, but the rifle works now and my neighbor seems happy.
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Not a bad result for 10 pumps with a premier 7.9gr. pellet.

Monday, September 25, 2017

Daisy 881 Disassembly Part 2

On I go…

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Just a picture for later…

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Some lever details.

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BB port cover.

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Getting the bolt out was confusing, it’s in two parts, one of which enters from the outside of the slot.

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Just a little dirty…

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The barrel shroud slides off.

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Barrel is held in place by a clamp.

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Urethane transfer port seal – which I think is well designed actually.

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One pin to remove the trigger/exhaust valve assembly

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The compression tube is filthy.

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Inlet valve. The cup seal is hard to find – let me know where to get one for what it should cost (a buck or two) if you know.

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The trigger pin is only meant to come out one way – and of course I pushed it out the wrong way.

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Notice the broken butt stock piece.

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Trigger group.

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Exhaust valve looks very similar/identical to those used on the 717 series pistols.

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All the parts…

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I took apart the pump piston, I don’t know what the broken bits are – plastic? fiber? Looks like one from a donor gun will fit tthough.

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I don’t think those pieces sticking out the side are anything but uncut sprue…

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Donor butt stock looks mostly the same.

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Now we’ll see if I can get it to work. It may be that the cleaning and o-ring replacement is all it needs, at least I hope so.

Daisy 881 Disassembly Part 1

It’s no secret that Derrick and I are not Daisy fanboys and although I have several of the 800 series rifles I haven’t felt the urge to do a post about them. But my neighbor uses one for garden pest control and it stopped holding air so I had to take it apart and see if I could fix it. Seal kits are ridiculously expensive and Daisy offers no parts for the older recalled models AFAIK. So we’ll see if I can get it running with what I have on hand. IMG_7808It looks good, but as you get into it you see some big differences between it and the luxury of a Sheridan…or some of Crosman’s better offerings.IMG_7813IMG_7815IMG_7817

So no point in taking off the butt plate.

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It does have a metal receiver…

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Screws removed and it sort of wiggles free.

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The butt stock is broken, will scavenge one from a donor…

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Safety and spring.

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The fore stock is held by one screw and a sliding catch.

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Push a pin out and the pump assembly comes free, which is nice.

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Piston assembly.

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Man that is nasty…I’m amazed it would pump at all.

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More to come…