Nissan 13231-38U00 Lifter-Valve

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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.

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

Mark the camshaft bearing caps from 1 to 4, indicating intake or exhaust with an "I" or "E," and mark arrows to show the front of the engine.