Nissan 13231-7S017 Lifter-Valve

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

Disengage the camshaft sprockets from the timing chains and support them with wire to prevent falling into the timing chain cover.

Secure the camshaft with holding lugs while loosening the retaining bolt, then remove the bolt and thrust plate.

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 sprockets and timing chain, holding the camshafts with a suitable wrench while tightening the sprocket bolts to the specified torque.