Nissan 13231-2Y869 Lifter-Valve

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To remove the components, first disconnect the cable from the negative terminal of the battery. Next, remove the intake plenum and the valve covers, then disconnect the electrical connectors at the camshaft position sensors and remove the sensors. Proceed to remove the timing chains and camshaft sprockets, and for models without exhaust timing control, remove the variable intake valve timing valves from the top of the number one camshaft journals. Mark the camshaft bearing caps from 1 to 4, indicating intake or exhaust, and ensure arrows point to the front of the engine. Loosen the camshaft bearing caps in reverse order of tightening, keeping them in order for reinstallation. Remove the bearing caps and camshafts, noting the markings for correct installation. Remove the Lash Adjusters from the cylinder head, keeping track of their original positions, and measure each journal diameter with a micrometer, replacing the camshaft if any journal is below the specified limit. Visually inspect the camshaft lobes, journals, bearing caps, and Lash Adjusters for wear or damage, and measure camshaft journal diameter and lobe height, replacing the camshaft if any measurements are below specifications. Check camshaft runout and endplay, replacing the camshaft or cylinder head if limits are exceeded. Inspect each Lash Adjuster for scuffing and check oil clearance for each camshaft journal using Plastigage, replacing components if clearance is greater than specified. For installation, remove old RTV sealant, set the number one piston at TDC, lubricate and install the Lash Adjusters, apply assembly lubricant to the camshaft lobes and journals, and install the exhaust camshafts with dowel pins facing up. Apply RTV sealant to the sealing surfaces and install new O-rings on the secondary timing chain tensioners. Install the bearing caps and bolts, tightening them in sequence, and check the protrusion of the front bearing caps. Install the camshaft sprockets and timing chain, holding the camshafts with a wrench while tightening the sprocket bolts. Complete the installation in reverse order of removal, checking and adjusting valve clearance if any part of the valve train was replaced, and finally reconnect the battery and perform necessary relearn procedures, especially for specific models if the Exhaust Valve Timing components were disconnected or removed.

Apply RTV sealant to the sealing surfaces of the No. 1 bearing cap(s) and install new O-rings on the secondary timing chain tensioner(s).

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

If air is trapped, reinstall the rocker arm shaft assemblies and valve cover, and bleed the air from the lifters by running the engine at 1,000 rpm for about 10 minutes.

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

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).

Mark the positions of the camshaft bearing caps with an "I" for intake or "E" for exhaust, and indicate the front of the engine.

Position the number 1 piston at TDC (Top Dead Center) on the compression stroke and take off the upper timing chain covers.

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.

Apply a bead of RTV sealant to the sealing surfaces of the No. 1 bearing cap(s), then install the bearing caps and bolts, tightening them hand tight before tightening the bearing cap bolts in several steps to the specified torque.

After installation, use a seal installation tool or appropriate diameter pipe to press the new seal squarely into the cylinder head until it bottoms out.