Question about Dodge D150

2 Answers

After having heads rebuilt and installing rocker arms, can't keep them tight. My book says they're auto adjusting... Just torque the bolt down to 21 ft-lb and theyr'e 'adjusted.' However, when I do this and run the engine for about 30 minutes, the valves start clicking. Upon inspection, several of the rocker arms have loosened themselves up (on both sides). How do I keep the rocker arm bolts from loosening themselves up without overtightening them?

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  • David Mcintosh
    David Mcintosh Sep 14, 2010

    The rocker arms have no adjusting bolt, only the bolts that hold the rocker arms on.

    Would it help to put some high-temp locktite on the bolts, then torque 'em down?

    The heads have just been reworked, but the machine shop should have taken care of clearances so the valve stems are the right length. Isn't that correct?

    After adjusting to 0 lash, I have to turn the bolt several turns to attain 21 ft-lb of torque

  • David Mcintosh
    David Mcintosh Sep 14, 2010

    There are no adjusting nuts associated with the rocker arm assembly. Only a single bolt that goes through the center of the rocker arm to hold it in place. There is no adjustment per se for these rocker arms.

  • David Mcintosh
    David Mcintosh Sep 15, 2010

    Thank you. You were a big help by assuring me that the rocker arms could not be overtightened. I tightened them up as tight as they would go and everything seems to be working fine now.

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  • Dodge Master
  • 79,189 Answers

Replace the adjustment nuts with new ones, they are a special type of nut that keeps its setting by friction between the crimp and the threads, this friction is given by a slight crimp to the nut that makes it out of round near the top of the treads, u can also install a product to the threads called Loctite red thread lock, U can also buy locking rocker arm adjustment nuts that use an allen screw to "lock" in the adjustment, these are avail from amny speed shops, one i use is Summit racing, another is Jegs speed, please keep in mind that other factors can cause this, one is low oil pressure caused by a camshaft bearings not being installed correctly, there are holes that allow oil to flow properly, if they are not lined up correctly to the block oil gallery then this can starve the lifter for oil pressure and they get noisy.

Posted on Sep 14, 2010

  • 2 more comments 
  • yadayada
    yadayada Sep 14, 2010

    Just replace the adjustment nuts and u will be fine

  • yadayada
    yadayada Sep 14, 2010

    sorry about that, your comments didn't show, raise the the torque by 5 pounds and use locktite red, they will not loosen then.

  • David Mcintosh
    David Mcintosh Sep 15, 2010

    Is it possible to overtorque the rocker arm lockdown bolts? That is, to tighten them so tight that the valves are partially open when they are supposed to be closed? Someone else told me to tighten them as tight as I can get them with a 3/8" ratchet and forget the torque wrench. Good advice or bad?

  • yadayada
    yadayada Sep 15, 2010

    no that is not possible with this type of none adjustable rocker arm pivots

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  • Dodge Master
  • 17,970 Answers

When I adjust mine I get about 1/8th turn from where I want it (if you want it 1/4 turn down from "O" lash just turn it 1/8th turn down). Then I snug up the allen screw and turn the additional 1/8th turn with the nut only. You can tighten it much better this way versus turning the nut first and then locking down the set screw. Never had one loosen when done this way.

Solids are basically the same way; use the hex nut to get the correct clearance then back off 1/8th turn or so, snug the allen set screw, and turn the nut back to correct clearance.

If the top of your rocker arm studs has a crater (lack of better word) you shold file them flat, or you may end up having them loosen up again.

A couple of notes:
Many screw in studs are not straight, they wobble as you screw them in. Not too good!
ARP studs are terriffic and CHEAP for the quality of them. You have to jam the set screw down by turning the outer nut just as mentioned above.

If you just tighten the set screw down, they will usually loosen.
I've seen it happen too many times with guys who buy polly locks for the first time and do it wrong.

Hope helps.

Posted on Sep 14, 2010

  • 3 more comments 
  • ZJ Limited
    ZJ Limited Sep 14, 2010

    You have to torque em when the pushrods are @ there lowest location,
    meening you have to torque each rocker arm one by one and you have to
    turn the motor over by hand one by one, you can not just through em on
    and torque, there is a precedure that you have to follow.

    Here's the procedure copied from a similar thread on the "other" forum:


    Be sure the pair you're installing have the lifters on the base circle
    of the cam - in other words, both valves would be closed if the rockers
    were on. Hand tighten them to zero lash - with one hand rock the rocker
    while tightening with the other hand. Once it barely stops rocking (no
    gap on the pushrod end or the valve stem end) you've reached zero lash.
    From that point, torque to 18-20 ft-lbs while counting the number of
    times the bolt turns. It should reach that torque somewhere between 1/4
    turn and 1 turn. If it takes more than 1 turn to hit the torque when
    starting from zero lash, then shim the rocker higher. One .030" shim
    will reduce the number of turns by about 1/4. If it hits the torque in
    less than 1/4 turn - you'll likely have a hard time getting it to zero
    lash by hand, or to zero lash at all - you'll likely need longer
    pushrods. If it hits the torque just short of a 1/4 turn, you may be
    able to 'shorten' the rocker by evenly removing some material from the
    bottom of that rocker's fulcrum. Unless you've replaced the cam with a
    different one (sometimes replacement's have a slightly smaller base
    circle) you probably won't run into needing new pushrods.


    Once you've installed each pair this way (you'll have to turn the motor
    over by hand to get each pair of lifters on the cam's base circle -
    follow the firing order to minimize hand cranking) and cranked the car, if they're noisy, you may have to go back through with everything good
    and hot (or at least warm) and re-install. The clearances change
    slightly when things are warm, and I've found that any noisy ones I've
    had generally quiet down when I do the install procedure warm.


    Note that the rockers aren't really adjustable. The install procedure is
    there to tell you if things are dimensionally the way the should be in
    the engine. You can just torque them down - but then you won't find out
    about any potential dimensional issues until you crank it. And then,
    occasionally, you can find out about them the hard way.

  • ZJ Limited
    ZJ Limited Sep 14, 2010

    Could send us the year, model and engine sizes there?.

  • David Mcintosh
    David Mcintosh Sep 14, 2010

    It's a 1993 Dodge D150 PU with 318 engine.

  • David Mcintosh
    David Mcintosh Sep 14, 2010

    There is no valve lash adjusting screw. The valves are mounted in pairs with a bolt through the middle of each rocker arm.

  • ZJ Limited
    ZJ Limited Sep 14, 2010

    5.2L V8 Magnum 318, nice engine, the same in my Jeep; check the right procedure, maybe any step are lost...


    V8 and V10 Engines
    (see Figures 6, 7 and 8)

    The stamped steel rocker arms are
    arranged on one rocker arm shaft per cylinder head. Because the angle of
    the pushrods tend to force the rocker arm pairs toward each other,
    oilite spacers are fitted to absorb the side thrust at each rocker arm.
    The shaft is secured by bolts and steel retainers attached to the
    brackets on the cylinder head.









    Fig. 6: Details of the rocker arm assembly as installed in the V8 engines (click for zoom).











    Fig. 7: Rocker arm design including location of the lubrication holes-V8 engines






    1. Disconnect the spark plug wires.


    2. Disconnect the closed ventilation system and evaporative control system (if so equipped) from the cylinder head cover.










    Fig 8: Exploded view of the rocker arm assembly-V10 engine






    1. Remove each cylinder head cover and gasket.


    2. Remove the rocker shaft bolts and retainer.


    3. Remove each rocker arm and shaft assembly. Keep everything in order for installation in the original position.


    To install:



    1. Install the components in the same order as removed. For V8
      engines, the notch on the end of both rocker shafts should point to the
      engine centerline and toward the front of the engine on the left
      cylinder head and toward the rear on the right side.



    2. For 1989-92 V8 models: tighten the rocker arm bolts to 17 ft. lbs. (23 Nm).


    3. For all 1993-96 models: tighten the rocker arm bolts to 21 ft. lbs. (28 Nm).


    4. Install the cylinder head and cover gasket.


    5. Connect the spark plug wires.

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Hi there:

Rocker Arms & Pushrods


Removal & Installation

3.1L & 3.4L Engines
Left Side

  1. Before servicing the vehicle, refer to the precautions section.
  2. Drain the cooling system to a level below the coolant pipe on the front of the engine.
  3. Remove or disconnect the following:
    NOTEKeep the pushrods in order. Intake pushrods are 5 3 / 4 inches long and exhaust pushrods are 6 inches long.


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    Rocker arms and pushrods

To install:

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  2. Install or connect the following:

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  4. Start the vehicle and verify no leaks.




3_4_2013_5_26_48_pm.gif


Right Side
  1. Before servicing the vehicle, refer to the precautions section.
  2. Remove or disconnect the following:
    NOTEKeep the pushrods in order. Intake pushrods are 5 3 / 4 inches long and exhaust pushrods are 6 inches long.


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    Rocker arms and pushrods

To install:

  1. Lubricate all the valvetrain components with engine oil.
  2. Install or connect the following:

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  3. Start the vehicle and verify no leaks.





Hope this helps.

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Blown head gaskit need to remove head and replace with new ong


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  2. Relieve the fuel system pressure.
  3. Drain the cooling system.
  4. Remove or disconnect the following:
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b9d2546.gif
Cylinder head torquing sequence—2.2L (VIN 4) engine

  1. Install or connect the following:
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    • Ignition coil assembly
    • Radiator inlet pipe
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1 Answer

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Intake upper------ 18 ft lbs.
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Step one 11 ft lbs then tighten 90 degresss more

Upper intake
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Lower intake
132 inch lbs

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