GM 12625988
Camshaft

The right side Camshaft replacement requires two essential tools consisting of en-48313 Timing Chain retention tool (EN-48313) and en 46111 Crankshaft rotation socket (EN 46111). Start the procedure by taking out the lower Intake Manifold then proceeding with removal of the Camshaft cover together with Camshaft sensors and intake Camshaft position actuator solenoid. First obtain the en 46111 Crankshaft rotation socket (EN 46111) to rotate the Crankshaft while following the instructions until both camshafts are in a neutral position with the Camshaft flats parallel to the Camshaft cover rail. Loosen the Camshaft position actuator bolt using an open-end wrench applied to the hex at the Camshaft. Insert the en-48313 between the Camshaft actuators with its top line positioned next to the cylinder head after retracting its legs through unscrewing the en-48313. Turn the t-shaped handle of the en-48313 clockwise to expand its legs partially thus the feet will reach the Timing Chain until they securely enter link pockets to stop the chain from slipping. Secure the en-48313 with hand torque then fasten the hex with an open-end wrench. To attain proper loosening of the chain path the operator should pivot Camshaft components together while writing the marks for successful installation alignment. Begin by removing the Camshaft position actuator bolt after which you can extract the Camshaft bearing caps along with the Camshaft itself. After proper alignment of marks on Camshaft position actuators with the Timing Chain you can install the Camshaft actuators onto the camshafts and assemble bearing caps with camshafts. Put on the en-48313 before installing the Crankshaft balancer while applying an open-end wrench to both Camshaft hexes to block their rotation. The order for final installation includes Camshaft position actuators then intake Camshaft position actuator solenoid and Camshaft sensors and Camshaft cover and lower Intake Manifold.

The process starts with eliminating the Intake Manifold and next removing the left bank Camshaft cover before working on the left side Camshaft. Afterward you need to eliminate both the Camshaft sensors together with the Camshaft position actuator solenoid. Use the en 46111 and Crankshaft balancer to rotate the Crankshaft until the camshafts achieve neutral position with their flats parallel to the Camshaft cover rail. A open-end wrench must go on the Camshaft hex to stop its rotation while the Camshaft position actuator bolt can be loosened. The en-48313 requires unscrewing to fold its legs before you place it between Camshaft actuators with its bottom line resting against the Cylinder Head surface. Lengthen the en-48313 legs partially and slide one segment past the Timing Chain Guide while expanding it until the legs meet the chain without extra tension. Begin with hand-tightening the en-48313 before guiding the camshafts towards one another until the chain achieves required slack. Apply marks to the Camshaft position actuators along with the Timing Chain before you detach both components and the Camshaft position actuator bolt and camshafts. To assemble correctly position the Timing Chain and Camshaft position actuator alignment marks then install the camshafts onto the Cylinder Head followed by Camshaft actuator attachment. First install the bearing caps along with the camshafts and then eliminate the en-48313 by securing it with an open-end wrench to stop turns. First install the Camshaft position actuators while tightening them and proceed to install both the intake Camshaft position actuator solenoid before completing installation of the Camshaft sensors. The Crankshaft balancer needs installation before installing the Camshaft cover and Intake Manifold.

The right side Camshaft replacement requires removal of the Intake Manifold together with Camshaft cover and Camshaft sensors. The next step requires removal of the intake Camshaft position actuator solenoid followed by the Crankshaft balancer. Dear en 46111 operator please use your tool to turn the Crankshaft into a neutral position where both Camshaft flats rest parallel against the Camshaft cover rail. The open-end wrench should be used at the Camshaft hex to prevent rotation so the Camshaft position actuator bolt can be loosened. Reposition the en-48313 by unscrewing its legs before placing it between the Camshaft actuators. Position the top line of the tool near the cylinder head. Turn the t-shaped handle clockwise of the en-48313 until its feet touch the Timing Chain so each foot engages one link pocket and avoids slippage. Tighten the en-48313 by hand first until you can apply an open-end wrench to its hex-shaped component. The next step involves rotating camshafts towards each other until the en-48313 creates slack in the chain for proper tool installation. First label the Timing Chain and Camshaft position actuators before unbolt the Camshaft position actuator and removing both the Camshaft bearing caps and Camshaft from the engine. Start by positioning the marks from the Camshaft position actuators along with the Timing Chain and proceed with mounting Camshaft actuators onto the camshafts followed by bearing caps and camshafts installation. Install the Crankshaft balancer by applying an open-end wrench on the Camshaft hex to prevent Camshaft rotation. Replace the en-48313 component. The last step involves installing Camshaft position actuators followed by tightening the intake Camshaft position actuator solenoid along with Camshaft sensors and the Intake Manifold and Camshaft cover.

To replace the left side Camshaft get both the en-48313 Timing Chain retention tool (EN-48313) and en 46111 Crankshaft rotation socket (EN 46111). The procedure to replace the side Camshaft starts with removing the lower Intake Manifold and then proceeding to the left bank Camshaft cover. The second step involves removing both the Camshaft sensors together with the Camshaft position actuator solenoid. The en 46111 will rotate the Crankshaft to achieve Camshaft neutrality while both Camshaft flats align perpendicular to the Camshaft cover rail. An open-end wrench should be placed at the Camshaft hex point to stop it from rotating then you can loosen the Camshaft position actuator bolt. Use the en-48313 by unscrewing its legs before sliding it between the Camshaft actuators while keeping the scribed line next to the cylinder head. Extend the legs of en-48313 partially until one leg reaches behind the Timing Chain guide before continuing the expansion to contact the chain without torque. Operate the en-48313 by hand until the camshafts meet each other to produce chain slack. Begin the process by marking the Timing Chain together with Camshaft position actuators for correct reassembly before uninstalling the Camshaft position actuator bolt and the camshafts. Installation requires correct alignment between Camshaft position actuator and Timing Chain marks before installing the Camshaft actuators to the camshafts with Camshaft bearing caps. Begin by removing en-48313 while using an open-end wrench for prevention of rotation and proceed to correctly install and tightly fasten the Camshaft position actuators. Afterward install the intake Camshaft position actuator solenoid together with Camshaft sensors and Crankshaft balancer and Camshaft cover and lower Intake Manifold.

Remove the camshaft position actuator solenoid.

Remove the camshaft position actuator bolt and the camshafts.

Rotate the crankshaft balancer in a clockwise direction only, and then rotate the crankshaft until the camshafts are in a neutral position.

Use an open-end wrench to tighten the T-handle.

The EN-48313 (Timing Chain Retention Tool).

Remove the camshaft position actuator bolt, then take off the camshaft bearing caps and the camshaft.

Remove the crankshaft balancer and rotate the crankshaft with the EN 46111 until the camshafts are in a neutral position, ensuring the camshaft flats are parallel with the camshaft cover rail.

Remove each bolt on each cap one turn at a time until there is no spring tension on the camshaft, then mark the bearing caps for proper reinstallation.

Install the camshaft bearing caps and hand tighten the cap bolts, taking care to tighten the bearing cap bolts in increments of 3 turns until seated, reaching a final torque of 10 Nm (89 lb in).