Nissan 13231-2Y961 Lifter-Valve

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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 lifters, start by removing the valve cover and rocker arm shaft assemblies. Secure the lifters with rubber bands to prevent them from falling out of the guides. Remove the lifter guide assembly and then remove the lifters from the bores one at a time, keeping them in order. Avoid laying the lifters on their side or upside down to prevent air from becoming trapped inside.

If lifter pads are found to be worn during inspection, check the corresponding camshaft lobes or adjusting shims, as they may also be worn. Replace any worn lifter pads.

Lift the camshafts and mark them as "I" or "E." To reuse them, they must return to their original location. Lift the lifters and store them with their respective shims in labeled bags or a marked box.

Apply a bead of RTV sealant to the sealing surfaces of the No. 1 bearing cap(s) and the cylinder head. Install new O-rings on the secondary timing chain tensioner(s) and the VVT oil control orifice on the No. 1 bearing cap(s).

Inspect each lifter for scuffing and check oil clearance for each camshaft journal using Plastigage, replacing components if clearance is greater than specified.

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.

With the lifter in its bore, push down on the plunger at the top; if it moves more than 0.040-inch (1 mm), air may be trapped inside.

Apply a bead of RTV sealant to the sealing surfaces of the No. 1 bearing cap(s), then install the bearing caps and bolts, tightening them hand tight before tightening the bearing cap bolts in several steps to the specified torque.