Nissan 13231-7S001 Lifter-Valve

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

Inspect the contact and sliding surfaces of each lifter for wear and scratches. If the lifter pad is worn, it's advisable to check the corresponding camshaft lobe or adjusting shim on DOHC engines, as it will likely be worn too. Caution: On SOHC engines, do not lay the lifters on their side or upside down, as air can become trapped inside, requiring the lifter to be bled. Lifters can only be laid on their side if submerged in a pan of clean engine oil until reassembly.

Mark the positions of the camshaft bearing caps with an "I" for intake or "E" for exhaust, and indicate the front of the engine.

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.