school me on lock up and timing

Discussion in 'Revolver Handguns' started by jca1, Sep 28, 2010.

  1. jca1

    jca1 New Member

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    How do you check timing on a smith and wesson revolver.

    Also, how much play in lock up is acceptable?
     
  2. LONGHAIR

    LONGHAIR New Member

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    Check timing

    The timing I think is the cylinder and the barrel in line with one another. That's what i was told,to check before buying a used gun.
     

  3. masterPsmith

    masterPsmith New Member

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    Lock-up, timing, alignment, barrel/cylinder gap and endshake all need to be checked before buying a used S&W or any used revolver.

    Lock-up----Cylinder should not turn or have any excessive play when the bolt engages the cylinder cutouts.

    Alignment----Checked with a range rod down the barrel, range rod should slide into the cylinder without touching the mouth of the cyilinder on either side. If it does, then the cylinder is out of alignment and needs work.

    Timing----The cylinder should reach full lock-up just prior to full cock on single action and just prior to hammer drop on double action. This test should be performed with a slight amount of resistance applied to the cylinder.

    Barrel/Cylinder gap----The distance between the cylinder and barrel. Should be a maximum of .008" and preferably .006" or under.

    Cylinder endshake----The forward and aft movement of the cylinder. Should very little or no movement at all.

    You should also check full cock engagement. Pull hammer back to full cock then try to push it off full cock with your thumb. If it remains at full cock, you are fine. If it pushes off, pass on the gun, it will probably need both a hammer and trigger replaced.


    If you have a problem in any of these areas when checking a used revolver, pass on it or be prepaired to have it repaired

    Hope this helps,
    Jim..........
     
    Last edited: Oct 8, 2010
  4. Highpower

    Highpower New Member

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    Jim,
    Is that with an empty cylinder? Or do you load the chambers with cases first?

    Thanks.
     
  5. GNLaFrance

    GNLaFrance New Member

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  6. amoroque

    amoroque New Member

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    Here is a link to a video I found on the subject. The beginning is kind of weird, but lots of good info.

    [ame=http://www.youtube.com/watch?v=WMOGVWB-QHw]YouTube - How to check the condition of a used revolver[/ame]
     
  7. LONGHAIR

    LONGHAIR New Member

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    I saw that video before and it has good info. JIM (masterPsmith) I'm taking you with me next time I buy a gun, just so you know!!! great reply.
     
  8. jca1

    jca1 New Member

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    Excellent info. Thank you.

    Now a question:
    Smith 65, put in full lock up. Try to rotate cylinder to left(direction of cylinder rotation) will not budge. Try to rotate to the right(opposite of cylinder rotation) it does move a little tiny bit and then will move back to where it stopped at full lock up. So It's only moving in one direction right?
     
  9. GNLaFrance

    GNLaFrance New Member

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    Yes, that sounds like it's just fine.
     
  10. jca1

    jca1 New Member

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    Thanks GNLaFrance
     
  11. masterPsmith

    masterPsmith New Member

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    Most revolvers will have a very slight amount of play when locked-up, but should not "unlock" (bolt disengage from the cylinder cutout) when at full cock in either direction. If it does, you have problems..

    Jim..................
     
  12. jca1

    jca1 New Member

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    please explain further.....I'm kinda stoopid.:D