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Smith model 648 problem

blackhardt
Hello folks. I'm a new poster but have enjoyed reading in the forums for quite sometime. Now I have a question and couldn't think of a better place to ask it.
I have a S&W mod 648. I have enjoyed shooting this pistol for the past couple of years, but as I was shooting it a couple weeks ago it suddenly developed an issue. As the cylinder rotates aroundit stiffens up at 2 fireing postions. It does thisif I cock the hammer or shoot double action. It also does it either loaded or empty. I have cleaned it as best I can and lubed everything I can without taking anything apart. I can't see any rub marks other than what you might normmaly expect from a revolver that is fired regularly. anyone have any experience or ideas on what might be causeing this?
Most likely I will have to take it to a gunsmith but thought if it might be something simple I'd ask here.
Thanks, Karl
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Comments

4 comments

Date Votes
  • dg101win
    Next time you clean it check under the extractor star. Powder residue just loves to hide there.
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  • nmyers
    Not sure what your "normal cleaning" includes, but a brass bore brush & "toothbrush", used with solvent, are helpful when cleaning stainless steel guns. I also use #0000 steel wool to clean the front face of the cylinder & the forcing cone face.

    You may also want to check the ejector rod to see if it has unscrewed. (It has a reverse thread.)

    Neal
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  • blackhardt
    Dg101win, you hit it right on the head. I took a nylon brush to the area under the extractor and it works just fine now. I had thought I had gotten under there well but goes to show you can never get one completely clean.
    Mmyers thanks for the advice. I use both things yo spoke of but instead of using the steel wool I use a scotchbrite pad. Seems to work well on both faces of the cylinder as well as the forcing cone area.
    Thanks to both of you for the quick and helpful replies. Karl
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  • beantownshootah
    Good answer apparently given already.

    With respect to disassembly, I'd just add that every so often I like to remove the cylinder crane and clean inside there and the cylinder axis, because dirt and grime can accumulate inside and retard rotation of the cylinder.

    Basically if the cylinder won't spin freely, this is probably worth doing.

    Taking this off isn't "rocket surgery"; you just undo the retaining screw on the left side of the gun, the crane will come right out, and the cylinder slide off. Clean these up, add a teensy drop of oil, put them back on, re-tighten the screw and you're good to go.

    I never take off the gun sideplate. While you might do that under extraordinary circumstances (eg if the gun were totally immersed in water or such) so far as I know you simply don't have to take it off for normal cleaning and maintenance.
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