Nissan 13028-9E010 Chain-CAMSHAFT

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Before you do this, you should ensure that the engine is completely cool. Only experienced persons should attempt removing components for timing system work as mistakes can result in severe damage to the engine. For this reason, it is recommended that you either confirm your competence or when in doubt seek assistance from professionals before starting this process. First, relieve fuel pressure and remove battery cables. Remove the engine cover, drive belts, idler pulley brackets and spark plugs. Position number one piston at TDC on the compression stroke while removing both drive belts, idler pulley brackets and all spark plugs. Raise the front of vehicle and place it on jackstands; also drain cooling system and engine oil from there. Proceed to take off hoses as necessary marking them, taking out crankshaft sensor crankshaft pulley air conditioning compressor air conditioning compressor bracket upper and lower oil pans upper and lower intake manifold plenums valve covers cooling fan radiator power steering pump fan pulley bracket power steering pump bracket alternator water bypass pipe etc. Take out camshaft and variable valve timing (VVT) sensors from front timing chain cover with VVT actuator covers loosening cover bolts. Disconnect wiring harnesses from top front timing chain cover brackets, ensuring that number one piston remains at TDC on compression stroke when removing front timing chain cover.Remove primary timing chain tension by stretching it; then detach primary tensioner primary tensioner pivot arm/chain guide upper timing chain guides.Carefully secure secondary timing chain tensioners prior to removal of camshafts sprocket bolts then disengage primary timing chains from respective sprockets.Draw marks around camshaft sprockets being careful not to damage sensor ring then remove them along with secondary timings chains.Remove crankshaft sprocket as well as lower timing chain guide and inspect all components for wear.Verify the correct counting links, comparing new versus old chains.If any secondary tensioners were removed they should be reinstalled with the dowels on camshafts pointing upwards.At this point install secondary timing chains and sprockets with timing marks aligned- unlock secondary chain tensioners, remove stopper pins.Installation of primary timing chain should be done on primary camshaft sprockets, crankshaft sprocket as well as water pump sprocket with colored chain links being matched with respective sprocket marks. Upper timing chain guides should also be installed at this moment.Timing chain tensioner and assembly of primary tensioner arm/chain guide should be installed, ensuring that number one piston remains at TDC while timing marks aligning.Finally tighten camshaft sprocket bolts clean and seal front timing chain cover and install cover bolts using proper sequence.Place new O-rings in WT orifices then apply sealant to variable valve timing actuator covers, installing them over dowels on front timing chain cover.The wiring harness and bolts for the front timing chain cover can now be reattached.Power steering pump bracket; Fan pulley bracket may also need to be mounted if they were detached.The reverse removal procedure should be followed during installation; then adhere to sealant manufacturer recommendations, allow it to cure, replace oil filter, refill oil and coolant then start engine checking for leaks. Note that when air pressure in high pressure chamber of primary timing chain tensioner is released there is a possibility that you will hear some level of noise from the driving chains but this will diminish with time.

The engine's timing chain assembly is made up of a lower chain that links the crankshaft sprocket to an idler sprocket on the cylinder head, and also an upper chain which connects the idler sprocket to both camshaft sprockets. Occasionally, replacing such timing chains is a complex process since they are usually meant to last for as long as the engine remains operational; doing so would require removal of the oil pan. To remove the upper timing chain, drain coolant system, removing valve cover, power steering pump, upper idler pulley and camshaft sprockets. Then move on to the lower timing chain by firstly removing the upper timing chain. Remove distributor, various hoses and crankshaft pulley/vibration damper while ensuring that engine remains at TDC for No. 1 piston throughout. If desired, drain engine oil as well as remove oil pan and oil pump pick-up. Take away lower timing chain cover, tensioner arm, tension arm guide piece, oil slinger and oil pump drive gear. In order to make head removal more convenient however, note that it's best in such cases to trim off the head gasket flush with cylinder head surface. Examine parts for wear or damage before installation by matching silver-colored link on lower timing chain with crankshaft sprocket mark and attentively following each step involving both idler sprocket (s), chain guide (s), tensioner arm (s) as well as tensioner (s) in order to ensure correct tensioning. Apply RTV sealant letting it cure prior to securing upper timing chain cover into its position together with installing all necessary components involving camshaft sprockets above: then fill fluids back in followed by running engine slowly looking out for possible leakages.

To remove the upper timing chain, you need to drain the cooling system, remove the valve cover, power steering pump, upper idler pulley, and camshaft sprockets.

Install the secondary timing chains and sprockets with timing marks aligned, then remove stopper pins from secondary chain tensioners. Install the primary timing chain on the crankshaft sprocket, water pump sprocket, and primary camshaft sprockets, aligning colored chain links with sprocket marks, and install upper timing chain guides. Install primary tensioner arm/chain guide and timing chain tensioner assembly, making sure the number one piston remains at TDC and timing marks align.