Nissan 13231-2Y822 Lifter-Valve

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Apply moly-based engine assembly lubricant to the camshaft lobes and journals. Install the camshafts in their original positions with the dowel pins facing up and inline with the cylinder bank.

Install the bearing caps and bolts, tightening them in a specific sequence.

Apply moly-based engine assembly lubricant to the camshaft lobes and journals, and install the exhaust camshafts with dowel pins facing up.

To remove the camshafts, remove the cylinder heads and gently pry off the camshaft cover plate. Use holding lugs to secure the camshaft while loosening the retaining bolt, and remove the bolt and thrust plate. Carefully pry out the camshaft oil seal without scratching or nicking the camshaft. Pull the camshaft out of the cylinder head using a twisting motion.

Camshaft runout can be checked by setting up the camshaft with a dial indicator and slowly turning it to observe readings. Compare these readings to specified runout values, and if they exceed the specified limit, the camshaft should be replaced.

Start by disconnecting the cable from the negative terminal of the battery.

Next, remove the intake plenum and the valve covers.

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

Inspect the lifters for wear, and during installation, lubricate each lifter with clean engine oil.

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.

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