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S&W Revolver Detailed Disassembly, Deep Clean and Reassembly

Discussion in 'Gunsmithing & Repairs' started by _CY_, Aug 27, 2010.

  1. _CY_

    _CY_ Sharpshooter

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    check to see if Model 18-3 is in time. accuracy and safety depends on cylinder being in correct position when hammer is dropped.

    cock hammer back into locked position. cylinder properly in time is locked up.

    ahome.tulsaconnect.com_toug_cpf_sw50.JPG

    cylinder stop is in center of picture

    ahome.tulsaconnect.com_toug_cpf_sw51.JPG

    slowly pull trigger, cylinder stop will first drop, then raise up about mid point between slots on cylinder. as hand rotates cylinder, stop will dovetail into slot locking up cylinder.

    ahome.tulsaconnect.com_toug_cpf_sw52.JPG

    if you can rotate cylinder with hammer fully cocked, then revolver is out of time. fixing requires ordering an oversized hand, requires custom fitting.

    ahome.tulsaconnect.com_toug_cpf_sw54.JPG

    use a feeler gauge to check gap between cylinder and barrel.
    call S&W for tolerances, which could be different for each model.

    Model 18-3 measures .007in front gap (.008 feeler gauge was a forced fit), .006in for rear gap. side to side rotation at lockup ended up at .003in after new stop was installed.

    ahome.tulsaconnect.com_toug_cpf_sw55.JPG

    Fin.... whew, what a long writeup!!!
    and yes double action is smoother and cylinder lockup is tighter.

    ahome.tulsaconnect.com_toug_cpf_sw49.JPG
     
  2. _CY_

    _CY_ Sharpshooter

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    removing an extra stubborn barrel pin without damage ... this requires a 5C collet set typically used by machinist.

    ahome.tulsaconnect.com_toug_cpf_sw56.JPG

    ahome.tulsaconnect.com_toug_cpf_sw57.JPG

    clean threads with alcohol, then use only medium strength Blue Locktite

    ahome.tulsaconnect.com_toug_cpf_sw58.JPG
     
  3. _CY_

    _CY_ Sharpshooter

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    Next up is to reduce trigger return spring weight. too much reduction is not good as this could effect follow up shot speed.

    ahome.tulsaconnect.com_toug_cpf_sw59.JPG

    clipping coils off spring will reduce total travel length, causing problems.
    correct method is to reduce diameter of spring material by setting a special fixture (nail & visegrip), then grind off. (or purchase a reduced weight spring)

    ahome.tulsaconnect.com_toug_cpf_sw60.JPG

    easy does it... go slow ... a few thousands at a time

    ahome.tulsaconnect.com_toug_cpf_sw61.JPG

    sand spring surface to remove rough edges ... reduces friction with spring holder

    ahome.tulsaconnect.com_toug_cpf_sw92.JPG
     
  4. _CY_

    _CY_ Sharpshooter

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    let's focus on the top sear, which is pinned to hammer.
    drive out pin using a steel punch. top sear gets large load during double action pull. so all sides of sear needs to be stoned. ark white rock bottom surface that mates to trigger's sear face.

    ahome.tulsaconnect.com_toug_cpf_sw63.JPG

    ahome.tulsaconnect.com_toug_cpf_sw64.JPG

    ahome.tulsaconnect.com_toug_cpf_sw65.JPG
     
  5. _CY_

    _CY_ Sharpshooter

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    setting trigger return spring can be a challenge. here's a special tool that makes job easy.

    make sure blade is thinner than spring holder slot

    ahome.tulsaconnect.com_toug_cpf_sw76.JPG

    file notch with a quality file with square edges

    ahome.tulsaconnect.com_toug_cpf_sw77.JPG

    simply insert tool, push spring pass pin then rotate home

    ahome.tulsaconnect.com_toug_cpf_sw78.JPG

    ahome.tulsaconnect.com_toug_cpf_sw79.JPG
     
  6. _CY_

    _CY_ Sharpshooter

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    as revolver is fired, cylinder heats up and grows longer. if gap between barrel and cylinder is too tight, revolver will cycle fine cold. but jams after a few shots.

    ammo can be very dirty, especially .22LR. take a brass brush and give underneath injector and top of cylinder a good scrub. make certain injector is able to seat completely into cylinder face.

    even tiny amounts of debris under injector can reduce end gap and cause revolver to jam after a few shots.

    ahome.tulsaconnect.com_toug_cpf_sw97.JPG

    check gap with feeler gauge after cleaning. gap opened up after cleaning

    ahome.tulsaconnect.com_toug_cpf_sw98.JPG
     
  7. _CY_

    _CY_ Sharpshooter

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    It's now time to close this brief article out with a how to put the side plate back on.

    Thanks for looking... Fin.

    ----------------

    by now if you've been following along... you will have taken off and put side plate back on several times. here's how to put on side plate the easy way.

    note how safety rides inside groove on side plate

    ahome.tulsaconnect.com_toug_cpf_sw66.JPG

    first slide safety to position below

    ahome.tulsaconnect.com_toug_cpf_sw67.JPG

    align side plate's groove with safety, then slide upwards to home

    ahome.tulsaconnect.com_toug_cpf_sw68.JPG

    after side plate lays down flat, wack with a soft sided tool

    ahome.tulsaconnect.com_toug_cpf_sw69.JPG
     
  8. John6185

    John6185 Sharpshooter

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    Very informative and helpful, thanks for posting!
     
  9. FrankNmac

    FrankNmac Sharpshooter

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    It only took almost seven years for this to get a comment! Now I am doubling that number. I did like the pictures and explanations of the process.
     
  10. APH Tactical

    APH Tactical Sharpshooter

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    Very nice post, and incredibly informative!
    I don't know if this term had every been used before(hard to be "original" in 2017) but if not, then I'd like to take a moment and use this post to call this the first official...
    "ZOMBIE THREAD" lol
     

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