Nissan 13231-2Y920 Lifter-Valve

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Always inspect the camshafts and lifters thoroughly, and check the camshaft endplay.

Calculating the clearance between the lifter's outside diameter and the lifter bore's inside diameter helps determine if the lifter-to-bore clearance is within specified limits. Deviations from these values may require action, such as replacing lifter guide assemblies or cylinder heads.

Remove the variable valve timing valve(s) from the top of the number one camshaft journal(s).

Loosen the camshaft bearing caps in reverse order of tightening, keeping them in order for reinstallation.

Inspect the lifters for wear while they are out of the engine.

Measure each journal diameter with a micrometer, replacing the camshaft if any journal is below the specified limit.

Next, remove the lifter guide assembly and take out the lifters from the bores one at a time, keeping them in order for reinstallation.

Next, remove the timing chains and camshaft sprockets. For 2004 and later models, unbolt the camshaft position sensor from the rear end of each cylinder bank if necessary, ensuring the working end of the sensor does not touch metal after removal.

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.