Nissan 13231-2Y914 Lifter-Valve

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.

Install the bearing caps and bolts, tightening them hand tight before following the proper torque sequence in three steps.

Always inspect the camshafts and lifters thoroughly, and check the camshaft endplay.

The remainder of installation is the reverse of removal. If any part of the valve train was replaced, check and adjust the valve clearance.

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).

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

Next, remove the timing chains and camshaft sprockets. For 2004 and later models, unbolt the camshaft position sensor from the rear end of each cylinder bank if necessary, ensuring the working end of the sensor does not touch metal after removal.

Check each lifter bore diameter and compare the results to the specifications in this Chapter. If any lifter bore is worn beyond the specified limit, the lifter guide assembly (for SOHC engines) or the cylinder head (for DOHC engines) must be replaced.

If only the camshaft seals are being replaced, they can be done in-vehicle by removing the timing belt and camshaft sprockets, taking care not to damage the camshaft journal.