Nissan 13231-7S018 Lifter-Valve

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At the lower right of the main timing cover, remove the bolts and cover to access the right chain tensioner, which may need to be unbolted and angled out due to limited space.

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

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 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.

Carefully pry out the camshaft oil seal without damaging the camshaft, and pull the camshaft out using a twisting motion.