GM 12577693
Push Rods

A rack should hold valve train components for their original order when replacing the valve Rocker Arm and push rods. The process starts by taking off valve Rocker Arm covers before unbolting the valve Rocker Arm bolts until all rocker arms and pushrods can be removed from their positions. The intake push rods are 147.51 mm (5.81 in) long while exhaust push rods extend to 154.87 mm (6.1 in). The Pushrod installation process begins when prelube coating is applied to both ends of the pushrods while keeping in mind that the yellow-striped components function as intake pushrods and the blue-striped ones function as exhaust pushrods. The pushrods need to find their proper seating position in the lifter bore before applying prelube to the Rocker Arm friction surfaces. When the Cylinder Head or its components need reconditioning you will need shims (88894006) to use under the valve Rocker Arm pedestals. The next step involves installing rocker arms before securing the Rocker Arm bolts at 34 n.m (25 lb ft). The valve Rocker Arm covers need to be installed as the last step of the procedure.

A rack should hold the valve train components into their correct order before starting valve Rocker Arm and push rod replacement. The first step involves removing the valve Rocker Arm covers then succeeding to remove the valve Rocker Arm bolts and finally the rocker arms. The intake pushrods equal 147.51 mm (5.81 in) while the exhaust pushrods measure 154.87 mm (6.1 in) so proper records should be kept during the Pushrod extraction process. The installation begins with prelube application on Pushrod ends before their placement while maintaining intake pushrods with blue stripes facing upward in the lifter bore. Apply prelube coating to the entire surface area of the Rocker Arm friction components. During Cylinder Head component or reconditioning procedures the installation may require shims (88894006) which need to be placed beneath the valve Rocker Arm pedestals. After the procedures the technician installs the rocker arms followed by attaching the bolts while maintaining a torque of 34 n.m (25 lb ft). The last step includes reinstallation of valve Rocker Arm covers.

Remove the pushrods, which measure 147.51 mm (5.81 in) for intake and 154.87 mm (6.1 in) for exhaust.

Ensure the pushrods seat properly in the lifter.

Reinstall the valve rocker arm covers.

Ensure they seat in the lifter bore.

Coat the ends of the pushrods with prelube.

Reinstall the valve rocker arm cover(s).

Tighten them to 34 N.m (25 lb ft).

Tighten the valve rocker arm bolts for cylinders 1, 2, 7, and 8 exhaust to 30 Nm (22 ft. lbs.) and for cylinders 1, 3, 4, and 5 intake to 30 Nm (22 ft. lbs.).