Rocker arm assembly install

Small Block Mopar Engine

  1. moparker

    moparker Well-Known Member

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    I will first apologize for what will seem like some dumb questions to some of you. Ok, doing a cam swap in my Duster. Going from solid to hydraulic so I need to change rockers. First question. When the manual refers to left bank and right bank does this mean as if you were sitting in the car or standing in front of the car facing the engine? I was thinking from in the car. This is for the placement of the notches on the rocker shafts.

    Second question, The rocker arms themselves. they have RT and LT stamped on them. This would mean right and left correct? The reason I am asking is that they look correct on the rocker shafts reversed.

    So there you have it. Any info on this will be greatly appreciated. Thanks Mike.:banghead:
     
  2. diymirage

    diymirage HP@idle > hondaHP@redline

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    the rockers look off if you install them backwards ONCE they are fully installed

    it should look like this *\ / * \ / *\ / * \ / *

    * is a bolt of course
    the left rocker is slanted to the right, and the right rocker is slanted to the left

    even if you just lay them out and look at them it will make sense, just imagine a line running from the pushrod to the valve and that's the angle of the rocker

    as for as the shafts themselves go, the notch always goes to YOUR left and DOWN presuming you are on the side of the motor (as in leaning over a fender, rather then leaning over the front bumper)



    and, in case my drawing wasn't crystal clear already...a link to a better drawing

     
  3. moparker

    moparker Well-Known Member

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    As far as the shafts. One side the notch goes to the back of the motor the other towards the front. So I need to be sure what they mean when they say left or right.

    Your drawings were great. Thanks.
     
  4. 69_340_GTS

    69_340_GTS Well-Known Member

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    [​IMG]

    The key thing about rocker shafts is that the small oil holes point down, 15° below, or simply more vertical than the hold-down bolts. Do not trust those notches. I've seen them cut incorrectly.

    In the U.S. the left is the drivers side, the right is the passenger side. This is universal for all parts of all cars. "Handed" as if you are sitting in the car facing forward.
     
  5. diymirage

    diymirage HP@idle > hondaHP@redline

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    look at it this way
    if you stand on the driverside, put the notch to your left, and down

    if you stand on the passengerside, put the notch to your left and down


    you'll notice on is to the left, the other to the right, doesn't matter which one you call which

    (of course, this only work is the notches are correct)
     
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    • Rapid Robert

      Rapid Robert Well-Known Member

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      there are no dumb questions (only rude responses!). yes left/right as you are sitting in the dr seat. As said notch in the front & down on dr (left) bank and notch rearward and down on pass side. A welding rod may help you keep the pushrods lined up as you are torquing down. You want to draw down the (5) bolts so as to keep the shaft horizontle. the rocker arms will be at different levels of open so hand thread the bolts in until they just touch & the shaft is horizontle. then turn center bolt a half turn then near right bolt a half turn then bolt near left of center bolt a half turn then far right a half turn then far left a half turn then back to center & center bolt a half turn & repeat. some bolts will be loose and some tight but resist the urge to tighten em up, stay with 1/2 turn & go around & look at it from the other side to confirm the shaft is staying horizontle & adj your technique slightly as needed. wouldn't hurt to check preload.
       
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      • winstoninwisc

        winstoninwisc Taint easy livin free,season ticket ona 1wayride

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        theres a notch at the back of the rocker shafts keep them twards the back its for oiling and dis confusion lol for real notch goes to the rear
         
      • moparker

        moparker Well-Known Member

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        Are you saying both to the rear?
         
      • moparker

        moparker Well-Known Member

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        Thanks for all the help guys. Just want to make sure I get this right.
         
      • mderoy340

        mderoy340 Well-Known Member

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        Since you are going from mech to hyd why not use the adjustable rockers. Get the proper length pushrods (shorter) and you can set the preload of each lifter the same.
         
      • rigger3006

        rigger3006 Well-Known Member

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        driver side notch to front, passenger side notch to the rear
         
      • 69_340_GTS

        69_340_GTS Well-Known Member

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        (some of) You guys seem all confused abouth the notches, which are sometimes cut incorrectly anyways. To be safe, just look at the position of the oil holes!!!
         
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        • Daves69

          Daves69 Well-Known Member

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          Look at the picture in post #4 that 69_340_GTS posted. The wording at the top is for the bolt hole centerlines. Referencing the bolt holes, the oil hole centerlines are 15° toward the valve on both sides. When installed the oil holes are pointing down compared to the bolt holes.

          Note that nothing indicates the rocker shaft notch location in this picture.
           
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          • moparker

            moparker Well-Known Member

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            Last question. Rocker arms have LT and RT stamped on them. This means left and right correct?
             
          • diymirage

            diymirage HP@idle > hondaHP@redline

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            yes and no

            open up the first attachment I quoted and you will see

            each cylinder takes one left and one right hand rocker
             
          • moparker

            moparker Well-Known Member

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            So each cylinder would take one stamped LT and one stamped RT correct?
             
          • diymirage

            diymirage HP@idle > hondaHP@redline

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            yessir

            the reason is as follows, if you were to draw a line from the pushrods to the valves and back what you get is not a rectangle it is a trapezoid (the line running between the valvestems will be longer then the line between the pushrods)
            to make up for this the contact point for the valves on the rockers are offset , one to the left, one to the right

            trust me, once you get the heads on the engine, the pushrods in the hole and the rockers on the rockershaft it will be obvious
             
          • mguner

            mguner How many is too many?

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            And.... In case you haven't seen the trick to support the push rods while installing the rocker shafts... a small dowel rod or piece of heavy wire (yes coat hanger) can be cut to length and laid across the hump of the shaft pedestals and provide support for the pushrods till the rocker assemblies are bolted down. Then you can just pull the rod or wire out the front.
             
          • moparker

            moparker Well-Known Member

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            Thanks guys. I'm good.
             
          • 67Dart273

            67Dart273 FABO Gold Member FABO Gold Member

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            Also, do NOT overtorque. Many of the manuals over the years are WRONG. You have 5/16 bolts? These are 5/16 grade 5, and are torked at 17 ft lb dry, 13 oiled.
             
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            • TF360

              TF360 Well-Known Member

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              You should always have a book to reference. A "how to rebuild your small block mopar" would help-
               
            • moparker

              moparker Well-Known Member

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              That's why I started asking questions. I was looking at the manual and was making sure I was understanding it correctly. I agree 100%!
               
            • toolmanmike

              toolmanmike FABO MODERATOR Staff Member FABO Gold Member

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              Here's a photo. Look closely at the offset between the two.

              rocker arms.jpg
               
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              • 694spd

                694spd Well-Known Member

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                Here is a picture of a set of factory 340 rocker arms that I have.
                When you look at the push rod side of the arms. You can clearly see the difference in the offset of the cups.
                Note: The arms might not be assembled in their correct positions.

                340 Rocker Arms.JPG
                 
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                • pishta

                  pishta I know I'm right....

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                  And another vote! Unmarked even get dimples outboard...Ooh, notice change in design from toolmanmikes and these....interesting..
                  ssm10081-jpg.jpg
                   
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