Nissan 13231-2Y967 Lifter-Valve

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The camshafts and Lash Adjusters should always be thoroughly inspected before installation and camshaft endplay should always be checked prior to camshaft removal. Detach the cable from the negative terminal of the battery. Remove the upper and lower intake plenums and the valve covers. Remove the timing chains and the camshaft sprockets. Remove the variable valve timing valve(s) from the top of the number one camshaft journal(s). Mark the camshaft bearing caps from 1 to 4, and with an "I" or an "E", to indicate intake or exhaust. Also mark arrows indicating the front of the engine. Loosen the camshaft bearing caps in two or three steps, in the reverse order of the tightening sequence. Remove the bearing caps and the camshafts. Make a note of the camshaft markings to ensure correct installation. Remove the Lash Adjusters and shims from the cylinder head, keeping the proper shim with each Lash Adjuster. Inspect the camshaft and Lash Adjusters. Lubricate the Lash Adjusters with clean engine oil, then install the Lash Adjusters and shims into their original locations. 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. 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). Install the bearing caps and bolts and tighten them hand tight. Tighten the bearing cap bolts in several steps, to the specific torque, using the proper tightening sequence. Install the camshaft sprockets and timing chain. Hold the camshafts with a suitable wrench as you tighten the sprocket bolts to the specified torque. The remainder of installation is the reverse of removal. If any part of the valve train was replaced, check and adjust the valve clearance.

During the inspection process, carefully examine the camshaft bearing surfaces for any signs of damage like pitting, score marks, galling, or abnormal wear. If any such issues are detected, the cylinder head will require replacement. Measure the outside diameter of each camshaft bearing journal and record these measurements, then measure the inside diameter of the corresponding camshaft bearings. Calculate the oil clearance for each bearing by subtracting the journal's outside diameter from the bearing's inside diameter, and compare these results to specified clearance values. If any measurements fall outside standard wear limits, either the camshaft, cylinder head, or both must be replaced. Check camshaft runout by setting it up with a dial indicator and turning it slowly to observe readings. Compare these readings to specified runout values, and if they exceed the specified limit, replace the camshaft. Measure the camshaft lobe height with a micrometer, comparing it to the specified cam lobe height and calculating wear. If wear exceeds specified limits, replace the camshaft. Inspect Lash Adjuster contact and sliding surfaces for wear and scratches, including valve Lash Adjusters and valve adjusting shims for 2.4L and 3.5L engines. If Lash Adjuster pads are worn, check corresponding camshaft lobes or adjusting shims, as they may also be worn. Measure the outside diameter of each Lash Adjuster with a micrometer and compare it to specifications; replace any Lash Adjuster worn beyond specified limits. Examine Lash Adjuster bore diameters and Lash Adjuster-to-guide clearances, comparing the results to specifications; replace Lash Adjuster guide assemblies (3.3L engines) or cylinder heads (2.4L and 3.5L engines) if bore wear exceeds specified limits. Subtract the Lash Adjuster's outside diameter from the Lash Adjuster bore's inside diameter and compare the difference to the specified clearance. Ensure that all parts, whether new or old, undergo thorough inspection before reassembly, and for 3.3L engines, inspect rocker arms and shafts, replacing rocker arms if the pads are worn, and avoid attempting to restore them by grinding the pad surfaces.