Nissan 13231-7S004 Lifter-Valve

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Check the endplay with a dial indicator and replace components if measurements exceed specified limits.

Position the number 1 piston at TDC (Top Dead Center) on the compression stroke and take off the upper timing chain covers.

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.

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.

If only the camshaft seals are being replaced, they can be done in-vehicle by removing the timing belt and camshaft sprockets, taking care not to damage the camshaft journal.