Nissan 13231-2Y922 Lifter-Valve

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Detach the cable from the negative terminal of the battery.

Remove the sprocket retaining bolts, disengage the timing chain, and remove the camshaft sprockets.

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.

If air is trapped, reinstall the rocker arm shaft assemblies and valve cover, and bleed the air from the lifters by running the engine at 1,000 rpm for about 10 minutes.

Remove the bearing caps and camshafts, noting the markings for correct placement. The intake camshaft will have a drill spot on the side of the sprocket mounting flange.

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

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.

Lubricate the camshaft bearing journals and lobes with moly-based engine assembly lube before carefully placing it in the cylinder head. Install the thrust plate and retaining bolt, tightening it to the specified torque, and check the camshaft end play; if it's outside the specified range, replace the thrust plate.

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