Nissan 13231-2Y877 Lifter-Valve

Clean the bearing caps and journals, then install the lifters in their original locations after lubricating them with clean engine oil.

Complete the installation by reversing the removal process.

When inspecting, examine lifter bore diameters and lifter-to-guide clearances, comparing the results to specifications. If bore wear exceeds specified limits, replace lifter guide assemblies (3.3L engines) or cylinder heads (2.4L and 3.5L engines).

To install the camshafts, lubricate the bearing journals and lobes with moly-based engine assembly lube and carefully install them in the cylinder head. Install the camshaft thrust plate and retaining bolt, and check the camshaft endplay. If the endplay is outside the specified range, replace the thrust plate. Install the camshaft oil seal and complete the cylinder head assembly.

Install the camshaft sprockets and timing chain. Hold the camshafts with a suitable wrench as you tighten the sprocket bolts to the specified torque.

Unbolt the camshaft sprockets from the camshafts, ensuring not to let them rotate, and mark each sprocket before removal to avoid mixing them up.

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

Visually inspect the camshaft bearing surfaces for damage, measure the outside diameter of each camshaft bearing journal, and compare it to the specified limits.

On SOHC engines, inspect the rocker arms and shafts. If the pads are worn, the rocker arms must be replaced. Do not attempt to restore rocker arms by grinding the pad surfaces.

The first step is to take off the valve cover and the rocker arm shaft assemblies.

Begin by detaching the cable from the negative terminal of the battery, then remove the valve covers.