dont worry about why, just take another nut with same threads and tighten it on top of the existing nut
22 ft lbs torque on the rocker arm nuts is all that is required.
Each rocker arm has a bushing beneath the rocker arm screw. When the bushing is worn out, the rocker arm will continue to loosen up.
Yes, there is no adjustment.
With the valve fully closed and the lifter fully at the down position, tighten the adjusting nut until there is no up and down travel in the push rod. Then tighten the adjusting nut 1/4 turn. This is only if you have hydraulic lifters. Tighten the rocker studs to 50 ft/lb of torque. These are the bolts holding the rocker assembly in place.
With the engine at operating temperature back off the rocker arm until it slightly clatters. Tighten it down slowly until the valve is quiet and then tighten it 3/4 of a turn more.jd
There probably "pressed in" so take a couple of old nuts or balls from the rocker arm, put the nuts on the shaft, then put the rocker nut on and just tighten it up, it willl pull the shaft out of the head. Good Luck
take valve covers off and then unloosen each rocker arm and pull the push rod out, install new push rod and install rocker arm back on and tighten down nut according to factory specs.
24 foot pounds
check your rocker arm you may have tighten them to much, if there to tight your engine crank will not have enough space to turn over properly.
you can do both one by cuonting thread on rocker studs you should see about 4 to 5 two you can start engine tighten down till clatter stops then half turn back
There isn't a torque setting. You adjust the valves by tightening each rocker arm until there is no clatter and then tighten them 1/2 turn more.