Pontiac 12587985 Camshaft,Intake (Machining)

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Disassemble the camshafts, keeping camshaft caps marked for location and direction. Remove the rocker arms and hydraulic lash adjusters. Organize the rocker arms for reinstallation in their original positions and store the lash adjusters with their corresponding rocker arms. Repeat a similar process for the exhaust camshaft, marking the positions of rocker arms, removing them, and lifting the hydraulic lash adjusters.

During camshaft removal, carefully inspect hydraulic lash adjusters, rocker arms, camshaft lobes, bearing journals, and bearing journal oil clearance. Replace components as needed. Lubricate the rocker arms and hydraulic lash adjusters before reinstalling them. Lubricate and install the camshafts with proper alignment. Secure the camshaft bearing caps, slide the camshaft sprockets and timing chain, align the slots with sprocket projections, and tighten the camshaft sprockets with new bolts to the specified torque.