GM 12604896
Valve Cover

The replacement process of an exhaust camshaft and valve lifters begins by taking off the exhaust camshaft position actuator first. Start by turning each bolt on each cap one time until no spring tension exists on the camshaft before you mark each bearing cap for future installation. Bearing caps should be extracted after unbolting their hardware and subsequently the exhaust camshaft needs to be extracted. The correct order of roller followers and hydraulic adjusters should be kept throughout reinstallation. The work sequence requires you to uninstall both the camshaft roller followers and hydraulic element lash adjusters. The installation process requires inserting each hydraulic element lash adjuster into its bore before lubricating it together with the valve tips. The original placement of roller followers on the camshaft must be maintained because replacing the camshaft requires replacement of its followed followers as well. Locate the roller followers of the valve stem tip and lash adjuster and then put on the exhaust camshaft before applying lubrication. For bearing cap bolt installation use hand power only to reach a torque rating of 10 nm (89 lb in) when tightening produced equally across each bolt starting with three initial turns before final attachment. The exhaust camshaft position actuator needs final installation as the last step.

The first task in intake camshaft and valve lifter replacement requires removal of the intake camshaft position actuator. One turn of bolt removal at a time from the bearing caps will reduce the camshaft spring tension before you mark the caps for future reinstallation. Unfasten the bearing caps and their bolts before extracting the intake camshaft. Reinstallation of the roller followers and hydraulic adjusters requires proper organization. The next step involves removing camshaft roller followers together with hydraulic element lash adjusters from the mechanism. Insert the hydraulic element lash adjusters into their relevant Cylinder Head bores and lubricate them together with the valve tips using gm pn 12345501 (Canadian PN 992704) or equivalent product. The original placement of roller followers on the camshaft needs to be maintained during repairs; complete replacement of any camshaft mandates the exchange of related roller followers as well. Lubricate the camshaft roller followers that face the valve tips by using gm pn 12345501 (Canadian PN 992704) or equivalent product. Install the intake camshaft and follow it with gm pn 12345501 (Canadian PN 992704) or equivalent oil lubrication. Begin by installing the camshaft bearing caps while hand-tightening the cap bolts before properly torquing bearing caps to 10 n.m (89 lb in) total. Place the final component of intake camshaft position actuator.

The first step for replacing exhaust camshaft and valve lifters involves extracting the exhaust camshaft position actuator. You should take each bolt off bearing caps making a single rotation at a time to reduce camshaft spring tension before writing notes for correct future replacement. Begin by removing bearing caps before taking out their bolts then continuing with the removal of the exhaust camshaft. Maintain the order of all roller followers together with hydraulic adjusters so they can be reattached. Remove both camshaft roller followers as well as the hydraulic element lash adjusters from the engine assembly. The hydraulic element lash adjusters should be installed into their bore positions in the Cylinder Head after lubricating them alongside the valve tips using gm pn 12345501 (Canadian PN 992704) or equivalent product. Security measures require the exact placement of roller followers on the camshaft unless a new camshaft installation necessitates new followers. Place the roller followers onto the valve stem tips and lash adjusters while using the same lubricating product. The exhaust camshaft installation requires gm pn 12345501 (Canadian PN 992704) equivalent lubrication. Begin by tightening the bearing cap bolts using the palm before turning them by increments of three until reach maximum torque at 10 n.m (89 lb in). Reposition the exhaust camshaft position actuator as the last step of the procedure.

The replacement process of an exhaust camshaft and valve lifters begins by taking off the exhaust camshaft position actuator first. Start by turning each bolt on each cap one time until no spring tension exists on the camshaft before you mark each bearing cap for future installation. Bearing caps should be extracted after unbolting their hardware and subsequently the exhaust camshaft needs to be extracted. The correct order of roller followers and hydraulic adjusters should be kept throughout reinstallation. The work sequence requires you to uninstall both the camshaft roller followers and hydraulic element lash adjusters. The installation process requires inserting each hydraulic element lash adjuster into its bore before lubricating it together with the valve tips. The original placement of roller followers on the camshaft must be maintained because replacing the camshaft requires replacement of its followed followers as well. Locate the roller followers of the valve stem tip and lash adjuster and then put on the exhaust camshaft before applying lubrication. For bearing cap bolt installation use hand power only to reach a torque rating of 10 nm (89 lb in) when tightening produced equally across each bolt starting with three initial turns before final attachment. The exhaust camshaft position actuator needs final installation as the last step.

First, remove the camshaft position intake actuator.

Install the rear bearing cap and bolts, tightening them to 10 Nm (89 lb in), followed by the cylinder head opening plate and bolts, also tightened to 10 Nm (89 lb in).