Nissan 13231-7S010 Lifter-Valve

Unbolt the camshaft sprockets from the camshafts, ensuring not to let them rotate, and mark each sprocket before removal to avoid mixing them up.

Mark the positions of the camshaft bearing caps with an "I" for intake or "E" for exhaust, and indicate the front of the engine.

Remove the bearing caps and camshafts, noting the camshaft markings for correct installation. Remove the lifters and shims from the cylinder head, keeping the proper shim with each lifter and maintaining their order for reinstallation.

For camshaft removal, take off the cylinder heads, then remove the bolts and gently pry off the camshaft cover plate at the transaxle end.

Subtract the outside diameter of each lifter from the inside diameter of the lifter bore and compare the difference to the clearance specified in this Chapter. If both the lifter and the bore are within acceptable limits, this measurement should fall within tolerance. However, if new parts such as lifters or the lifter guide assembly (SOHC) or the cylinder head (DOHC) have been changed, this clearance may no longer fall within the specified limit.