273 rocker arm adjustment

Discussion in 'Small Block Mopar Engine' started by 70dart65coronet, Jul 16, 2017.

  1. 70dart65coronet

    70dart65coronet mopar or nocar

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    Do you guys have a good method for adjusting 273 adjustable rocker arms?

    I have them in my 340 in my 70 dart.

    I notice when i warm up i can hear them, and i am also getting some real fine metal flakes in the oil filter. Once it warmed to noise goes away.

    I was looking for some specs for a cold setting, and then i would check them hot.

    There are so many different variations out there.

    This is what i came up with, what do you think?

    put engine at TDC #1 (at initial timing setting, which i think im set at 12 degrees) and check exhaust valve 1 3 4 8, intake valve 1 2 5 7

    rotate one full rotation to get to TDC#6 and check 2 5 6 7 exhaust, 3 4 6 8 intake

    The cam card say zero lash for both intake and exhaust, (it doesn't specificity hot or cold, so i assume hot)

    Thanks
     
  2. 65Val

    65Val Average Length Member

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    Are you using a solid or hydraulic cam with your adjustable rockers?
     
  3. pishta

    pishta It's a gift.... FABO Gold Member

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    lash at 0 tells me its a hydro. If that's the case, give it .045 preload cold (one turn) after you tighten adjuster and feel any resistance on a spinning pushrod (0 lash). Adjustables are nice like that. Flakes in oil isn't good. If I were you, Id take those lifters out, remove their pistons (lifter) and flush them in solvent.
     
    Last edited: Jul 17, 2017 at 10:25 AM
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    • Bodyperson

      Bodyperson Well-Known Member

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      Did you index the shafts correctly. How is the geometry?
       
    • Bodyperson

      Bodyperson Well-Known Member

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      This is old school. Warm the engine. Pull a valve cover. Start engine. Back off rocker till it makes noise. Tighten rocker until noise goes away. Go one quarter turn more. Lather rinse repeat.
       
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      • 69_340_GTS

        69_340_GTS Well-Known Member

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        A) Find out where the metal chips are coming from!
        B) Don't do the adjustment hot. It does not matter with hydraulic lifters.
        C) Don't worry about the ignition timing.
        D) Use the Mopar chart for which valves to adjust, in what order.
        E) "0" lash sounds wrong. Loosen the adjuster. Tighten just until the pushrod has no free play. Should go about 3/4 to 1 full turn tighter after that for the proper pre-load.

        312P4452989.jpg
         
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        • T56MaxTorq

          T56MaxTorq Well-Known Member

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          Metal flakes in the oil!? It's noisy because your cam is going flat. The wear will just continue to run away. Change the cam and oil pump.
           
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          • 67Dart273

            67Dart273 Well-Known Member

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            I can tell you this........."metal flakes" has nothing to do with valve lash
             
          • T56MaxTorq

            T56MaxTorq Well-Known Member

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            The excessive lash came from the wear of the cam and lifters, most likely.
             
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