Nissan 13020-8J101 Camshaft Assy

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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.

In order to drop the Lash Adjusters, it will be necessary to firstly take off the valve cover and the rocker arm shafts. Tighten secured the Lash Adjusters by lifting them up and placing a rubber band around each of them so that they don't come off the guides; if a Lash Adjuster is found off, put it back to its place. Subsequently, unbolt the Lash Adjuster guide assembly and pull out the Lash Adjusters out of the bores individually with the help of a pick and ensure that the Lash Adjusters are put back in the same manner as they were taken out. Do not lay the Lash Adjusters on their side or upside down as this increases the trap of air; they can only be laid on their side if they are submerged in clean engine oil. Place the tip of your finger on the plunger button, while the Lash Adjuster is in its bore, push up the plunger; if it moves more than 0.040-inch (1 mm) you may have trapped some air inside. If air is suspected, return the rocker arm shaft assemblies and valve cover, then tap on the Lash Adjusters until all the air is out of the Lash Adjusters by starting the engine under no load and letting idle for about 10 minutes with revs at 1000 rpm. After that, the valve cover and the rocker arm shaft assemblies have to be removed, and the plunger check has to be done one more time. If air remains, replace the Lash Adjuster with a new one. When the Lash Adjusters are out check for wear and during positioning, apply clean engine oil on each of the Lash Adjusters. To remove the camshaft, first, lose the cylinder heads and then use the camshaft cover plate bolts and remove the other one carefully at the transaxle side. Position holding lugs on the camshaft to prevent it from rotating as the retaining bolt is loosened to follow by the removal of the bolt and thrust plate. Carefully take out the camshaft oil seal without causing any doze on your camshaft and pull the camshaft by twisting it. To install, use moly-based engine assembly lube to the camshaft bearing journals and the lobes and then gently Vladimire the camshaft in the cylinder head. Place the thrust plate with the retaining bolt and fasten it to the required torque to check the end play of the camshaft; if the amount is higher than the recommended limit, then change the thrust plate. Last, replace the camshaft oil seal, while other parts of the cylinder head assembly should be put back in the reverse of the process of removal. Depending on what is being done, the camshaft seals can be replaced in-car provided the timing belt and camshaft sprockets are removed; special care should be taken not to harm the camshaft journal. It is recommended to use a seal installation tool or a proper diameter of pipe to force the new seal straightly into the cylinder head while seated.

Loosen the camshaft bearing caps in reverse order of tightening, keeping them in order for reinstallation.

Install the camshaft sprockets and timing chain, holding the camshafts with a suitable wrench while tightening the sprocket bolts to the specified torque.

Measure the outside diameter of each lifter with a micrometer and compare it to the specifications in this Chapter. If any lifter is worn beyond the specified limit, replace it.