Nissan 13231-2Y971 Lifter-Valve

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Measure the outside diameter of each camshaft bearing journal and the inside diameter of the corresponding camshaft bearings using appropriate measuring tools. Record these measurements for comparison.

Mark each camshaft for correct reinstallation, and label the camshaft bearing caps from 1 to 4, indicating intake or exhaust with an "I" or "E," along with arrows pointing to the front of the engine.

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

Remove the upper and lower intake plenums and the valve covers. Then, remove the timing chains and the camshaft sprockets.

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.

Remove old RTV sealant and set the number one piston at TDC.

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.

Inspect the camshaft and lifters before proceeding with installation by placing the lifters and shims back into their original locations.

Measure the outside diameter of each camshaft bearing journal and record your measurements. Compare them to the journal outside diameter specified in this Chapter. Then measure the inside diameter of each corresponding camshaft bearing and record the measurements. Subtract each cam journal outside diameter from its respective cam bearing bore inside diameter to determine the oil clearance for each bearing. Compare the results to the specified journal-to-bearing clearance. If any measurements fall outside the standard specified wear limits, either the camshaft or the cylinder head, or both, must be replaced.