Q: How to remove and reinstall rocker arm and Pushrod in 3.8L V6 engine on Pontiac Grand Prix?
A: To remove the rocker arm covers, detach them from the cylinder heads. For models with pedestal-mounted rocker arms, loosen the rocker arm pivot bolts one at a time and detach the rocker arms along with their bolts, pivots, and pivot retainers, ensuring to first loosen the rocker arm bolts. In models with rocker arm shafts, loosen the three bolts on each shaft gradually, starting from the center and working outward. Keep track of the rocker arm positions for reinstallation and store each set of components in marked plastic bags. If all rocker arms are removed, take out the pushrod guide plate beneath them. Remove the pushrods and store them separately to avoid mix-ups during installation, using a perforated cardboard box if multiple pushrods are involved, and label the front of the engine. Inspect each rocker arm for wear, cracks, and damage, particularly at contact points with pushrods and valve stems, and check the pivot seat and faces for galling, stress cracks, and unusual wear patterns; replace any worn or damaged rocker arms and install new pivots or shafts as needed. Ensure the hole at the pushrod end of each rocker arm is clear and inspect the pushrods for cracks and excessive wear, rolling each across a piece of plate glass to check for bending. Lubricate the lower end of each pushrod with clean engine oil or moly-base grease before reinstalling them in their original locations, ensuring they seat completely in the lifter socket. Apply moly-base grease to the ends of the valve stems, upper ends of the pushrods, and pivot faces to protect mating surfaces prior to building engine oil pressure. Coat the rocker arm pivot bolts with moly-base grease, then install the pushrod guide plates, rocker arms, pivots, and pivot retainers, tightening the bolts to the specified torque while ensuring the pushrods seat properly in the rocker arms. Finally, install the rocker arm covers.