Having problems with your Dodge D150 ?

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?

Posted / edited by AnonymousUser on : 19-02-2018

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.
When I adjust mine I get about 1/8th turn from where I want it (if you \015\012want it 1/4 turn down from "O" lash just turn it 1/8th turn down). Then I\015\012 snug up the allen screw and turn the additional 1/8th turn with the nut\015\012 only. You can tighten it much better this way versus turning the nut \015\012first and then locking down the set screw. Never had one loosen when \015\012done this way.
\015\012Solids are basically the same way; use the hex nut to get the correct \015\012clearance then back off 1/8th turn or so, snug the allen set screw, and \015\012turn the nut back to correct clearance.

If the top of your rocker arm studs has a crater (lack of better word) \015\012you shold file them flat, or you may end up having them loosen up \015\012again.

A couple of notes:
\015\012Many 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.

\015\012If you just tighten the set screw down, they will usually loosen.
\015\012I've seen it happen too many times with guys who buy polly locks for the first time and do it wrong.

Hope helps.
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