Nissan 13231-2Y800 Lifter-Valve

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.

To remove the components, start by disconnecting the cable from the negative terminal of the battery, then remove the valve covers. Position the number 1 piston at TDC on the compression stroke and take off the upper timing chain covers. Mark the relationship of the timing chains to the camshaft sprocket marks, then retract and remove the left timing chain tensioner. At the lower right of the main timing cover, remove the bolts and cover to access the right chain tensioner, which may need to be unbolted and angled out due to limited space. Unbolt the camshaft sprockets from the camshafts, ensuring not to let them rotate, and mark each sprocket before removal to avoid mixing them up. Disengage the camshaft sprockets from the timing chains and support them with wire to prevent falling into the timing chain cover. Mark the positions of the camshaft bearing caps with an "I" or "E" for intake or exhaust, and indicate the front of the engine. Loosen the camshaft bearing caps in the reverse order of the tightening sequence, keeping them in order for reinstallation. Remove the timing chain cover-to-front camshaft bearing cap bolts and the front camshaft bearing cap-to-cylinder head bolts, using a plastic hammer if necessary to break the RTV sealant. Remove the camshafts, marking or storing them separately for their original locations, and take out the Lash Adjusters from the cylinder head, keeping track of their installation positions. Visually inspect the camshaft bearing surfaces for damage, measure the outside diameter of each camshaft bearing journal, and compare it to the specified limits. Measure the height of each camshaft lobe and check for runout using a dial indicator. While the camshaft is in the cylinder head, check the endplay with a dial indicator and replace components if measurements exceed specified limits. Inspect each Lash Adjuster for scuffing, measure their diameters, and determine oil clearance. For installation, lubricate the Lash Adjusters with clean engine oil and place them back in their original locations. Apply camshaft installation lubricant to the camshaft lobes and journals, then install the camshafts with dowel pins facing up. Apply RTV sealant to the sealing surfaces of the front camshaft bearing caps, install the bearing caps and bolts, and tighten them hand tight before following the proper tightening sequence. Engage the timing chains with the camshaft sprockets, aligning the previously made marks, and install the camshaft sprocket bolts while preventing the camshafts from turning. Finally, complete the installation in reverse order of removal, checking and adjusting valve clearance if any part of the valve train was replaced.

Camshafts and Lash Adjusters should be examined before being used and the endplay of the camshafts should be measured before removing the cams. Start with the removal of the timing chains and the camshaft sprockets; afterward, remove the camshaft position sensor brackets from the drivers' ends of the cylinder heads. Identify each camshaft so that they can be reinstalled in their proper location; on the camshaft bearing caps, place the number 1, 2, 3, and 4, also note whether it is an intake or exhaust cam with an "I" or "E," and arrows facing forward. Unfasten the camshaft bearing caps vice versa, yet make sure that they are properly arranged to be refastened back. Bearing caps and camshafts should be removed at this time and the marks made at this time noted for replacement. The intake camshaft will have a drill spot, having to do with the side of the sprocket mounting flange. Thoroughly pull out all the Lash Adjusters from the cylinder head, and make sure that they are properly arranged. Check the camshaft for wear or damage on the lobe, journals, bearing caps, and Lash Adjusters. Camshaft journal diameter may also be checked with a micrometer and also the lobe height, and if they do not tally with the standard ones, then they are replaced. Verify the run out and end play of the camshaft and replace the camshaft or the cylinder head if there is a need for that. For each Lash Adjuster, look for scuffing and the presence of score marks, and check the Plastigage oil clearance for each camshaft journal to replace the component if it exceeds the specs. Scrub the bearing caps and journals with clean, warm buffer and reposition the Lash Adjusters in their initial positions after applying clean engine oil on them. Spread the moly-based engine assembly lubricant on the camshaft lobes and journals and pitch the exhaust camshafts featuring the dowel pins up. Next, spread RTV sealant on the sealing surfaces of the No. 1 bearing cap(s); also, it is crucial to fit new O-rings onto the second generation of the tensioning of the timing chain. Bolt in the bearing caps and tighten them by hand and then fix the bearing cap bolts, in accordance with the following torque pattern; step one, two, three. Verify the position of the front bearing caps and, depending on the cylinders, should come out to slightly less than 0.0055 inch behind the front face of the cylinder head. I was putting the camshaft sprockets and the timing chain on the car, and while tightening the bolts on the sprockets, I used a wrench to hold the camshaft in place. Reassemble the engine in the reverse order to the disassembly; ensure that if any of the valve train parts were replaced, to set valve clearances; the battery should be connected to perform several relearn procedures.

To remove the components, start by disconnecting the cable from the negative terminal of the battery, then remove the valve covers. Position the number 1 piston at TDC on the compression stroke and take off the upper timing chain covers. Mark the relationship of the timing chains to the camshaft sprocket marks, then retract and remove the left timing chain tensioner. At the lower right of the main timing cover, remove the bolts and cover to access the right chain tensioner, which may need to be unbolted and angled out due to limited space. Unbolt the camshaft sprockets from the camshafts, ensuring not to let them rotate, and mark each sprocket before removal to avoid mixing them up. Disengage the camshaft sprockets from the timing chains and support them with wire to prevent falling into the timing chain cover. Mark the positions of the camshaft bearing caps with an "I" or "E" for intake or exhaust, and indicate the front of the engine. Loosen the camshaft bearing caps in the reverse order of the tightening sequence, keeping them in order for reinstallation. Remove the timing chain cover-to-front camshaft bearing cap bolts and the front camshaft bearing cap-to-cylinder head bolts, using a plastic hammer if necessary to break the RTV sealant. Remove the camshafts, marking or storing them separately for their original locations, and take out the Lash Adjusters from the cylinder head, keeping track of their installation positions. Visually inspect the camshaft bearing surfaces for damage, measure the outside diameter of each camshaft bearing journal, and compare it to the specified limits. Measure the height of each camshaft lobe and check for runout using a dial indicator. While the camshaft is in the cylinder head, check the endplay with a dial indicator and replace components if measurements exceed specified limits. Inspect each Lash Adjuster for scuffing, measure their diameters, and determine oil clearance. For installation, lubricate the Lash Adjusters with clean engine oil and place them back in their original locations. Apply camshaft installation lubricant to the camshaft lobes and journals, then install the camshafts with dowel pins facing up. Apply RTV sealant to the sealing surfaces of the front camshaft bearing caps, install the bearing caps and bolts, and tighten them hand tight before following the proper tightening sequence. Engage the timing chains with the camshaft sprockets, aligning the previously made marks, and install the camshaft sprocket bolts while preventing the camshafts from turning. Finally, complete the installation in reverse order of removal, checking and adjusting valve clearance if any part of the valve train was replaced.

Mark the camshaft bearing caps from 1 to 4, indicating intake or exhaust with an "I" or "E," and mark arrows to show the front of the engine.

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.