Nissan 13020-EN20A Camshaft Assy

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Disconnect the cable from the negative terminal of the battery. Remove the valve cover and check the valve clearances, recording the measurements; if any valves are out of specification, they can be corrected before reinstalling the camshafts. For 2.0L engines, remove the timing chain cover and Camshaft Position (CMP) sensor, while for 2.5L engines, disconnect the electrical connectors from the Intake Valve Timing (IVT) control solenoid and the CMP sensor. Remove the IVT/camshaft sprocket cover bolts in reverse of the tightening sequence and take off the cover, using a sharp tool to cut the RTV sealant securing it. Remove the CMP sensor and its bracket. Loosen the right front wheel lug nuts, raise the vehicle securely on jackstands, and remove the right front wheel. Remove the inner fender splash shield. Position the engine at TDC on the compression stroke for the number one cylinder, marking the links of the timing chain that correspond to the timing marks on the camshaft sprockets, ensuring not to turn the camshaft(s) or crankshaft afterward to avoid valve damage. Use a screwdriver to retract the plunger of the chain tensioner, securing it with a drill bit or Allen wrench, and then remove the tensioner. Hold the hexagon part of the camshaft with a wrench and remove the camshaft sprocket bolts, then take off the sprockets. For 2.5L engines, remove the upper timing chain guide through the timing chain cover. Before removing the camshafts, check camshaft endplay with a dial indicator, ensuring the total movement does not exceed the limit; if it does, replace the camshaft or cylinder head. Loosen the camshaft bearing caps in reverse of the tightening sequence, carefully prying up the bridge on 2.0L engines while keeping the caps in order for reinstallation. Remove the bearing caps or bridge and lift the camshafts straight up and out, then pull the Lash Adjusters straight up and store them in numbered plastic bags or a marked box. Visually examine the camshaft lobes, journals, bearing caps, and Lash Adjusters for any signs of wear or damage, and measure camshaft journal diameter and lobe height with a micrometer, replacing any worn components. Check the oil clearance for each camshaft journal by cleaning the bearing caps and journals, laying the camshafts in place without lubrication, placing a strip of Plastigage on each journal, installing the bearing caps, and tightening the bolts in sequence. After removing the bolts and bearing caps, compare the width of the crushed Plastigage to the scale on the envelope, replacing components if the clearance exceeds specifications. Scrape off the Plastigage carefully to avoid damaging the journals or bearing caps. Apply moly-based engine assembly lubricant to the camshaft lobes and journals, then install the camshafts in their original positions at TDC, ensuring the dowel pins are correctly oriented. Apply a 1/8-inch bead of RTV sealant to the mating surface of the camshaft bridge for 2.0L engines, install the bearing cap bridge and bolts, and tighten them in sequence. For 2.5L engines, apply RTV sealant to the timing chain cover mating surface, install the bearing caps and bolts, and tighten them in sequence, being careful not to disturb the sealant when installing the no. 1 bearing cap. Install the camshaft sprockets and timing chain, aligning the marks made earlier with the timing marks on the sprockets. Complete the installation in reverse order of removal, checking and adjusting the valve clearance if any part of the valve train was replaced, then reconnect the battery and perform the necessary re-learn procedures.

Disconnect the cable from the negative terminal of the battery. If working on a 1.8L engine, drain the engine coolant. Remove the intake manifold and valve cover. Check the valve clearances and record the measurements; if any valves are out of specification, they can be corrected before reinstalling the camshafts. Loosen the right front wheel lug nuts, raise the vehicle, and support it securely on jack stands before removing the right front wheel. Remove the inner fender splash shield. Position the engine at TDC on the compression stroke for number one cylinder, marking the links of the timing chain that correspond to the timing marks on the camshaft sprockets. Caution: Do not turn the camshaft(s) or crankshaft after marking, as this could cause valve contact with the pistons. Remove the timing chain cover and timing chains. For 1.6L engines, remove the exhaust camshaft sprocket first by holding the hexagon part of the camshaft with a wrench, then remove the sprocket bolt and the sprocket itself. Rotate the intake camshaft sprocket to the most advanced point, loosen the three front camshaft cap mounting bolts, and remove the cap. Locate the No.1 oil hole for the camshaft and apply at least 44 psi of air pressure to the oil hole while rotating the camshaft sprocket counterclockwise until the stopper pin hole becomes visible. Insert a 0.098 inch (2.5 mm) thick Allen wrench through the notch and into the stopper pin hole to secure the camshaft sprocket in the most advanced position. Hold the hexagon part of the camshaft with a wrench and remove the camshaft sprocket center bolt, then remove the sprocket. For 1.8L engines, mark the relationship of the sprocket to the camshaft front bearing cap, hold the hexagon part of the camshaft with a wrench, and remove the camshaft sprocket bolt before removing the sprocket. Before removing the camshafts, use a dial indicator to check camshaft endplay. Loosen the camshaft bearing caps in reverse order of tightening, keeping the caps in order for reinstallation. Remove the bearing caps or bridge and lift the camshafts straight up and out, then pull the Lash Adjusters straight up and store them in numbered plastic bags or a marked box. Visually examine the camshaft lobes, journals, bearing caps, and Lash Adjusters for any signs of wear or damage. Measure camshaft journal diameter and lobe height with a micrometer, and check the oil clearance for each camshaft journal using Plastigage. Clean the bearing caps and camshaft journals before laying the camshafts in place without lubrication, then install the bearing caps and tighten the bolts in sequence. Do not turn the camshaft while the Plastigage is in place. After checking the clearance, scrape off the Plastigage carefully. Apply moly-based engine assembly lubricant to the camshaft lobes and journals, then install the camshafts in their original positions at TDC, ensuring both camshaft dowel pins face the 12 o'clock position. For 1.6L engines, apply a 1/8-inch bead of RTV sealant to the timing chain cover mating surface, install the bearing caps and bolts, and tighten them in sequence. For 1.8L engines, apply a 1/8-inch bead of RTV sealer to the camshaft bridge sealing surface, install the bearing cap bridge and bolts, and tighten them in sequence. Install the camshaft sprockets and timing chain, aligning the marks on the timing chain with the timing marks on the camshaft sprockets. The remainder of the installation is the reverse of removal, and if any part of the valve train was replaced, check and adjust the valve clearance. Finally, reconnect the battery and perform the necessary re-learn procedures.