GM 90537261 Camshaft Asm,Intake

To remove the camshafts, begin by disconnecting the cable from the negative battery terminal and setting the engine to 60-degrees before TDC. Take off the valve cover(s) and timing belt. Use a wrench on the hex drive of the camshaft to prevent it from turning while removing camshaft sprockets, making sure to mark their original positions. Pick off bearing caps from the cylinder head and take note of their original locations. Remove camshafts from cylinder head along with camshaft seals. Put each lash adjuster in numbered containers to prevent mixing them up. This process has to be repeated for rear cylinder head only camshafts. Check if there is wear and roundness on all cams and lash adjusters after removing them. Compare measurements after measuring outside diameter for each lash adjuster. Inspect wear or overheating on lobe of every camshaft. Check measurements after measuring lobe height for each cam lobe. Inspect these parts for wear or pitting:-Camshaft bearing journals-Cylinder head bearing surfaces Measure each journal's diameter, checking for excessive wear too; For this purpose, clean the bearing surfaces and install the Plastigage-carrying camshafts as well as bearing caps; To be sure about journal oil clearance, measure compressed strand-width; To tap towards and away from gauge let it measure endplay of a dial indicator checking in readings;. After inspection is done, position engine at 60-degrees before TDC again (engine should be rotated by hand). Lubricate cylinder head roller bores (with oil) as well as roller followers and leave them in their original bores once you're done with that operation (again). Put new oil seals on both ends of both cams., Apply anaerobic sealant between front caps' cylinder head; first caps must have anaerobic sealant applied between them., Use lubrication for camshaft installation on both the journals and lobes., Then, attach the camshaft bearing caps in their original positions, ensuring they are tightened down in the proper sequence. Finally, replace all remaining parts including timing belt and sprocket which will complete reassembly. Finally, connect the battery.

Install the front and rear camshaft caps and tighten them to the specified torque. Also, install the upper timing chain guide.