Nissan 13231-2Y904 Lifter-Valve

Inspect each lifter for scuffing and score marks, and check the oil clearance for each camshaft journal using Plastigage, replacing components if the clearance exceeds specifications.

Apply moly-based engine assembly lubricant and place the new camshafts in the cylinder head.

Inspect the lifters for wear while they are out of the engine.

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.

During the inspection process, lifter contact and sliding surfaces, including valve lifters and valve adjusting shims for 2.4L and 3.5L engines, should be inspected.

Disconnect the electrical connectors at the camshaft position sensors and remove the sensors.

Check camshaft runout by placing the camshaft between two V-blocks or back into the cylinder head and set up a dial indicator on the center journal. Zero the dial indicator, turn the camshaft slowly, and note the dial indicator readings. Record your readings and compare them with the specified runout in this Chapter. If the measured runout exceeds the specified runout, replace the camshaft.

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

Secure the lifters by raising them slightly and wrapping a rubber band around each one to prevent them from falling out of the guides. If a lifter falls out, return it to its original location immediately.