I have to replace a rocker arm nut that won't stay tight. I understand there is a procedure to quiet the rocker with the engine running. I did it last night but the darn nut "backed off" again. With the engine idling, I tightened the rocker nut until the tapping stopped. Then I backed it off again to make it tap. Following that, I tightened the nut until the tapping stopped and then turned the nut another 1/2 turn. I can't find this procedure in the "How to rebuild your small block Chevy" book. It only addresses adjusting the valve lash with the engine static. I'd appreciate the help or a link to this procedure guys.
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Re: 71 SB adjusting valve lash (engine running)?
The point where the clatter just stops is referefd to as "zero lash". From there, thighten 1/4 to 1/2 turn, IN 1/4 TURN INCREMENTS. After each 1/4 turn, allow the engine to stabalize.
You may simply need a new nut. They are self locking, and over time the distrubed thread portion of the nut can wear to the point it will no longer self lock.
Be sure the stud isn't pulling out of the head. This can be a problem on heads with pressed in studs.
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