GM 1241851 Arm, Valve Rocker Arm Light

The valve covers are first removed to disassemble 305 and 350 Chevrolet as well as 301 Pontiac engines. Remove the rocker arm nut and ball, then take away the rocker arm from the rocker stud. In order to maintain the assembly in its original form mount all the rocker arms together on the same stud. Next, remove the pushrod from bore making certain that it returns with same end in block. To replace, perform removal steps conversely and adjust Pontiac engines' rocker ball retaining nut up to 20 ft.lbs (26 Nm). On Chevy engines, start nut onto stud and set valves according. For 263 (Diesel), 307, 350 (Gas and Diesel), and 403 Oldsmobile engines, start by removing valve covers. Each pair of rocker arms are taken out by first removing two bolts that keep the pivot attached to head for every cylinder; this procedure is repeated twice for other pairs of rockers arms so that for proper reassembly all should be kept in order. Ensure that lifters are off cam lobe and valves are closed before installing rocker arms. Attach remote starter or have an assistant bump engine over until valves close for each cylinder. With valves closed install paired rocker arms lubricating all pivot and wear points between them with white grease before installation. Finally torque retaining bolts to 25 ft lbs (32 Nm) then put back valve covers with new gaskets.

The valve covers are first removed to disassemble 305 and 350 Chevrolet as well as 301 Pontiac engines. Remove the rocker arm nut and ball, then take away the rocker arm from the rocker stud. In order to maintain the assembly in its original form mount all the rocker arms together on the same stud. Next, remove the pushrod from bore making certain that it returns with same end in block. To replace, perform removal steps conversely and adjust Pontiac engines' rocker ball retaining nut up to 20 ft.lbs (26 Nm). On Chevy engines, start nut onto stud and set valves according. For 263 (Diesel), 307, 350 (Gas and Diesel), and 403 Oldsmobile engines, start by removing valve covers. Each pair of rocker arms are taken out by first removing two bolts that keep the pivot attached to head for every cylinder; this procedure is repeated twice for other pairs of rockers arms so that for proper reassembly all should be kept in order. Ensure that lifters are off cam lobe and valves are closed before installing rocker arms. Attach remote starter or have an assistant bump engine over until valves close for each cylinder. With valves closed install paired rocker arms lubricating all pivot and wear points between them with white grease before installation. Finally torque retaining bolts to 25 ft lbs (32 Nm) then put back valve covers with new gaskets.

The rocker arms should be installed on the shaft with the external rib on each arm pointing away from the rocker arm shaft bolt located between each pair of rocker arms.

After removing the rocker arm covers, the next step is to remove the rocker arm shaft assembly bolts.

Lubricate all parts with engine oil and assemble them on the rocker arm shaft, ensuring they are positioned in the proper sequence, as they are stamped right (R) or left (L) for correct placement.

Each rocker arm should be centered on the Three-quarters in hole in the shaft.

Pry out the nylon rocker arm retainers using a pair of channel locks.