Nissan 13231-38U10 Lifter-Valve

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When inspecting the camshaft lobes, measure the camshaft lobe height with a micrometer and compare it to the specified cam lobe height. Calculate wear, and if wear exceeds specified limits, replace the camshaft.

Position the engine at TDC (Top Dead Center) for cylinder one, marking the timing chain links and sprockets for reference. Additionally, mark the sprockets with "I" (intake) and "E" (exhaust) for further identification.

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.

Detach the cable from the negative terminal of the battery.

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

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

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.