GM 24503999
Rocker Arms

The starting procedure for repairing valve Rocker Arm and push rod components starts with left and right valve Rocker Arm cover removal then continued with the valve Rocker Arm pedestal retaining bolts before removing the pedestal. Place all assemblies on a clean surface before storing the components in the correct order for reassembly. The next step demands removal of both Rocker Arm assembly and pushrods you need to clean the bolts from thread adhesive and perform assessments on valve rocker arms and pushrods. The pushrods and valve Rocker Arm assembly installation process starts from adding them first followed by adding the pedestal. The bolts which secure the lower Intake Manifold to the Cylinder Head become accessible through upper Intake Manifold removal because servicing of the lower intake requires this step. Use gm p/n 12345493 (Canadian P/N 10953488) threadlocker compound together with equivalent products to cover the valve Rocker Arm bolt threads before installing the pedestal retaining bolts at 15 nm (11 ft. Lbs.) + 90 degrees using the torque angle meter (J 36660-A). The last step involves reinstalling both valve Rocker Arm covers while listening for unusual valve train sounds.

Service and repair of valve Rocker Arm and push rod requires the electronic torque angle meter (J 36660-A) as a necessary tool. The first step includes removing the left or right valve Rocker Arm cover together with the Rocker Arm bolts while placing every component on a clean surface for storage before reassembly. The service procedure begins with removing the valve rocker arms and continuing to remove all rocker arms means you must remove the push rod guide plates then the push rods. All components including push rods, valve rocker arms, bolts and guide plates need cleaning before checking that valve Rocker Arm bolts possess no remaining thread adhesive. The tapped holes in the Cylinder Head should be cleared with compressed air before applying fresh engine oil to the push rod terminals at which point they get installed in their factory placements on the Cylinder Head. Fasteners with correct part numbers need installation for push rod guide plates and valve rocker arms to prevent harm from imprecise tightening. Apply threadlocker gm p/n 12345493 (Canadian P/N 10953488) or equivalent onto the Rocker Arm bolt threads before installing the valve Rocker Arm bolts which need 15 nm (11 ft. Lbs.) torque applied and additional 90° rotation using the electronic torque angle meter (J 36660-A). After replacing the left or right valve Rocker Arm cover reinstall it along with a thorough examination of the valve train for abnormal noises.

A torque angle meter (J 45059) serves as the fundamental tool which you need to service and repair valve rocker arms with attached push rods. Climb into the service by first taking off the left and right valve Rocker Arm covers and then removing the pedestal retaining bolts to detach the pedestal. Prior to reassembly both assemblies need to sit on a sanitized surface while all components need to be placed for reinstallation at their initial removal positions using their original mating surfaces. To continue remove both Rocker Arm assembly components and pushrods while cleaning all thread adhesive from bolts and examining both valve rocker arms as well as pushrods. The pushrods need to be installed first before the valve Rocker Arm assembly and ending with the pedestal installation. The two bolts securing the lower Intake Manifold to the Cylinder Head become accessible only after completing upper intake service because this procedure is required to work on the lower intake. Install threadlocker gm p/n 12345493 (Canadian P/N 10953488) pain or equivalent to the bolt threads on the valve Rocker Arm pedestal before securing the bolts with the pedestal. Use the torque angle meter (J 45059) to secure valve Rocker Arm bolts at 15 nm (11 ft. Lbs.) + 90° torque angle. To finish the procedure replace both valve Rocker Arm covers then check for any valve train noise.

The service and repair of valve rocker arms and push rods begins with acquiring the necessary tool which is torque angle meter (J 36660-A). The service requires removal of left and right valve Rocker Arm covers and the pedestal retaining bolts before finally taking the pedestal out. The assemblies must be set on a sanitized area which will be used to store them before reassembly begins. After removing the Rocker Arm assembly with the pushrods you should clean all thread adhesive from the bolts before inspecting the valve rocker arms and pushrods. The pushrods must be installed first followed by the valve Rocker Arm assembly then the pedestal installation. Access to the two bolts holding the lower Intake Manifold to the Cylinder Head becomes possible only if you first remove the upper Intake Manifold. The threads of the valve Rocker Arm bolts require gm p/n 12345493 (Canadian P/N 10953488) threadlocker compound or equivalent solution for application before installing the bolts to their position with 15 nm (11 ft. Lbs.) + 90 degrees torques set by torque angle meter (J 36660-A). Completion of the installation requires putting back the left and right valve Rocker Arm covers and conducting a check for valve train noise.

The replacement of valve Rocker Arm and push rod demands an electronic torque angle meter (J 36660-A) as one of the required tools. Commence the process by taking out the valve Rocker Arm cover(s) and Rocker Arm bolt(s) while organizing these components on a clean space for later assembly. Start by taking out the valve Rocker Arm(s) and proceed with removal of push rod guide plate(s) after removing all rocker arms. Once both components are out, remove the push rod(s). Initial cleaning of push rod(s) as well as valve Rocker Arm(s) must be performed in a suitable solution followed by checking that valve Rocker Arm bolt(s) have no remaining thread adhesive. Use compressed air to remove oil from tapped holes in the Cylinder Head and follow with clean engine oil on the push rod ends which will be installed at their original positions. Install the valve Rocker Arm(s) while utilizing the specific part number fastener for the bolts because these bolts purposefully stretch during tight torques. Pick gm product number 12345493 threadlocker or replace it with an equivalent agent which you should apply to the Rocker Arm bolt threads. Then install all valve Rocker Arm bolts with a torque setting of 15 nm (11 ft. Lbs.) while using electronic torque angle meter (J 36660-A) to achieve 90 degrees additional bolt rotation. After installation of the valve Rocker Arm cover(s) check for any noise coming from the valve train.

The necessary tools for servicing the Rocker Arm assembly include a torque angle meter (J36660-A) among others. The service starts with taking off the valve Rocker Arm cover and then removing the Rocker Arm bolts. The next step requires removal of both valve rocker arms together with pushrods. Apply prelube gm p/n 1052365 or its equivalent to both ends of the push rods prior to installation; the intake valve push rods measure 144 mm (5.75 inches in length with a yellow designation and the exhaust valve push rods extend to 152.5 mm (6.0 inches) with a green designation. Secure the push rods in their original mounting points before applying the same prelube material to the Rocker Arm friction components. Install the valve Rocker Arm bolts with 14 nm (124 in. Lbs.) torque followed by additional 30-degree rotation using the torque angle meter (J36660-A). Reposition the valverocker arm cover as the last step.

Clean and inspect the camshaft(s) and rocker arm(s), repairing or replacing them as necessary.

Remove the valve rocker arm pedestal retaining bolts and the pedestal itself, ensuring to place the assemblies on a clean surface and store the components in order for reassembly.

Next, remove the rocker arms as outlined in the Valve Rocker Arm Removal - Left Side procedure.

Install the rocker arms followed by the applicable camshaft(s).

Reinstall the valve rocker arm cover(s) and inspect the valve train for noise.

Install the valve rocker arm cover(s) and inspect the valve train for noise.

Install the valve rocker arm assembly, followed by the pedestal.

Reinstall the left and right valve rocker arm covers and listen for any valve train noise.

First, remove the applicable camshaft(s) and then the rocker arms.

Apply thread lock GM P/N 12345493 (Canadian P/N 10953488) or equivalent to the rocker arm bolt threads.

Apply GM P/N 12345493 threadlocker or equivalent to the rocker arm bolt threads.

Torque Angle Meter (J 36660-A).

Remove the valve rocker arm covers.

Install the valve rocker arm guide plates and the valve rocker arms, applying GM P/N 12345493 (Canadian P/N 10953488) threadlocker or an equivalent to the rocker arm bolt threads.

Place the pushrods back in their original locations, coating the ends with GM P/N 1052356 or an equivalent.

Take out the valve rocker arms and the pushrods.

First, remove the valve rocker arm cover(s) and the rocker arm bolt(s).

Coat the rocker arm friction surfaces with camshaft and lifter prelube GM P/N 12345501 (Canadian P/N 992704) or an equivalent.

Use the correct part number fastener and apply GM P/N 12345493 threadlock or equivalent to the bolt threads.