Nissan 13231-2Y924 Lifter-Valve

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Remove the lifters from the cylinder head, ensuring they are stored in order.

Camshaft runout can be checked by setting up the camshaft with a dial indicator and slowly turning it to observe readings. Compare these readings to specified runout values, and if they exceed the specified limit, the camshaft should be replaced.

Remove the sprocket retaining bolts, disengage the timing chain, and remove the camshaft sprockets.

To remove the camshafts, remove the cylinder heads and gently pry off the camshaft cover plate. Use holding lugs to secure the camshaft while loosening the retaining bolt, and remove the bolt and thrust plate. Carefully pry out the camshaft oil seal without scratching or nicking the camshaft. Pull the camshaft out of the cylinder head using a twisting motion.

Check camshaft runout and endplay, replacing the camshaft or cylinder head if limits are exceeded.

Install the camshaft oil seal, ensuring the remainder of the cylinder head assembly follows the reverse of the disassembly process.

Measure the outside diameter of each camshaft bearing journal and record your measurements. Compare them to the journal outside diameter specified in this Chapter. Then measure the inside diameter of each corresponding camshaft bearing and record the measurements. Subtract each cam journal outside diameter from its respective cam bearing bore inside diameter to determine the oil clearance for each bearing. Compare the results to the specified journal-to-bearing clearance. If any measurements fall outside the standard specified wear limits, either the camshaft or the cylinder head, or both, must be replaced.

Remove the upper and lower intake plenums and the valve covers. Then, remove the timing chains and the camshaft sprockets.

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.