Nissan 13028-JA00A Chain-Timing CAMSHAFT

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The timing system is sensitive a single mistake made will have severe repercussions on the engine; should not attempt this exercise if NOT well conversant with such repairs, if in any doubt seek other professionals' assistance. Review all work to verify all the components and functionality of the vehicle are accurate prior to attempting to start the engine. For some of the 2.5L engines, it is suggested that the engine be pulled for this process; however, servicing the timing chain assembly is feasible with the engine still in the vehicle. For 2.0L engines, there is an oil pump drive chain; 2.5L engines have the balance shaft drive chain and assembly that are not separable. First of all, turn the engine to be at the TDC for the first cylinder and then turn the car's negative terminal of the battery off. Left the nut of the right front wheel slightly loose, safely chocks the car with jackstands and take off the right front wheel. Also, disconnect the lower front fenders, take off the power window master switch, unbolt the inner splash shield of the fenderwell, also unscrew the engine oil, take off the coolant reservoir, as well as the alternator and the bracket for it. The main modification is to remove the valve cover and the intake manifold and then place some support that would hold the engine from the top. While this is done, also take out the lower oil pan and in case of the 2.5L models both the lower and upper oil pans. For 2.0L models, first and foremost, you have to take off the water pump pulley. Remove the electrical connector for the IVT control solenoid depending on the vehicle's model or 2.5L engines, next, take out the mounting bolt and solenoid of the timing chain cover. Turn out the bolts securing the IVT/camshaft sprocket cover to the timing chain main cover and then the upper chain guide. Camshaft sprocket timing should coincide with TDC number one and the crankshaft pulley should also be removed with its hole aligned to the rear of the engine without being able to turn. This is done to release the timing chain cover mounting bolts and the cover with special attention to noting the location of the bolts in the case of reassembly. Secure the tensioner in the fully collapsed state, take out the bolts and remove the tensioner assembly and finally the timing chain. While removing the camshaft sprocket bolts use and open-end wrench to hold the camshaft firmly. To dismantle the oil pump drive chain on the 2.0L engines, the tensioner bolts, the tensioner, guide, spacer of the drive, oil pump drive chain and crankshaft sprocket must be removed. For handle 2.5 L remove the balance shaft chain tensioner bolts, tensioner, guide, chain and crankshaft sprocket, balance shaft unit mounting bolts. Check the wear and tear on the camshaft, idler, and crankshaft sprockets; the chains and the chain guides if any. For installation, if it has been removed, on 2.0L engines reinstall the oil pump and on 2.5L engines install the balance shaft new bolts should be used and their torque should be in sequence. Fit the crankshaft sprocket and the oil pump/balance shaft drive chain in such a way that the outer links, which are of different color, engage the mating lugs. Replace the tensioner and make sure the alignment marks are matching, releasing the staking pin to apply pressure. Place the timing chain, sliding colored links into matching grooves on sprockets, timing chain, with guide and tensioner set into place and tightened. Smear RTV sealant on the timing chain cover, and finally fit it into place using the bolts and tighten them as per correct pattern. For 2.5L engines, use RTV sealant to the IVT/camshaft sprocket cover while assembling it. The rest of the process of the installation is the reversal of the listed steps of removal. This should be done prior to starting the engine and with the engine off; turn the crankshaft at least two times in opposite directions; if there is much friction, it is advised to look for problems with the engine. Connect the battery terminal and do relevant relearn operations.

The timing system is complex, and severe engine damage will occur if mistakes are made. Only highly experienced individuals should attempt this procedure, and if there is any uncertainty, consulting an expert is advised. Double-check all work to ensure correctness before starting the engine. Begin by having a qualified air conditioning shop recover the refrigerant from the air conditioning system, then relieve the fuel system pressure and disconnect the negative battery terminal. Block the rear wheels, set the parking brake, raise the front of the vehicle, and support it securely on jackstands. Drain the cooling system, power steering fluid, and engine oil, then remove the power steering fluid reservoir, top and bottom engine covers, right inner fender splash shield, and front air inlet duct. Remove the intake manifold collector, valve covers, and dipstick, and position the number one piston at TDC on the compression stroke. Remove the drivebelt, upper radiator hose, lower radiator hose, coolant reservoir, cooling fan assembly, starter, power steering pump, air conditioning compressor, alternator and its bracket, and crankshaft pulley, ensuring the crankshaft does not rotate during removal. Disconnect wiring from the oil pressure switch and valve timing control wiring harness, label and disconnect any other interfering wiring and hoses, then remove the bolts from the IVT covers in reverse of the tightening sequence. Remove the drivebelt tensioner, air conditioning idler pulley and its bracket, and the bolts of the front timing chain cover in reverse of the tightening sequence, prying the cover off using the slots at the top. Remove the O-ring below each intake camshaft sprocket, confirm the number one piston is still at TDC, relieve tension on the primary timing chain, and lock the primary tensioner in place. Remove the primary timing chain tensioner, tensioner pivot arm/chain guide, and upper timing chain guides, then depress and lock the secondary timing chain tensioners. Remove the camshaft sprocket bolts, disengage the primary timing chain from the sprockets, and mark the camshaft sprockets before removing them along with the secondary timing chains. Remove the crankshaft sprocket and lower timing chain guide, then inspect the camshaft, water pump, and crankshaft sprockets for wear, as well as the chains and chain guides. Before starting the engine, carefully rotate the crankshaft by hand through at least two full revolutions, checking for resistance. Install the crankshaft sprocket and lower timing chain guide with the mark facing up, verify the correct timing chains, and reinstall secondary tensioners if removed. Position the camshafts correctly, install secondary timing chains and sprocket assemblies, and ensure timing marks are aligned. Install the primary timing chain, upper timing chain guides, primary tensioner arm/chain guide, and timing chain tensioner assembly, confirming the number one piston is still at TDC and timing marks are aligned before removing the stopper pin from the primary timing chain tensioner. Tighten the camshaft sprocket bolts, remove old sealant from the timing chain cover, install new O-rings, apply RTV sealant to the timing chain cover sealing surfaces, and install the cover and bolts in their original locations, tightening them in the recommended sequence. Install new O-rings in the IVT orifices and apply RTV sealant to the variable valve timing actuator covers, placing them in position and tightening the bolts. The remainder of the installation follows the reverse order of removal, adhering to sealant manufacturer's recommendations for assembly and curing times. Fill the crankcase with oil, install a new filter, refill the cooling system, reconnect the battery, and perform necessary re-learn procedures. Timing chain noise may be apparent after this procedure, which is normal and should subside as air bleeds out of the primary timing chain tensioner; if the noise persists, run the engine at 3,000 rpm until it diminishes.

Apply RTV sealant to the timing chain cover and IVT/camshaft sprocket cover before reinstalling them, tightening bolts in the correct sequence.