Question 1

What steps are involved in removing and inspecting the primary timing chain and crankshaft sprocket, as well as reinstalling the oil pump on Nissan Altima?

Accepted Answer

To remove the primary timing chain and crankshaft sprocket, it is not necessary to detach the camshaft sprockets, camshaft sprocket bolts, secondary timing chains, or primary timing chain tensioner pivot arm/chain guide; simply pivot the tensioner arm/chain guide to the left to facilitate the removal of the oil pump housing. Next, take off the oil pans and remove the oil strainer-to-oil pump bolts from the lower section of the oil pump, followed by the oil pump-to-engine block bolts. Gently pry the oil pump housing outward to clear the dowel pins on the engine block and remove it. For inspection, use a large Phillips screwdriver to take off the screws securing the front cover on the oil pump housing, clean all components with solvent, and inspect for wear and damage. Remove the oil pressure regulator cap, washer, spring(s), and valve, checking the oil pressure regulator valve sliding surface and valve spring; if either is damaged, replace them as a set. Measure the clearance of various oil pump components with a feeler gauge, including rotor tooth tip clearance, outer rotor-to-body clearance, cover-to-inner rotor clearance, cover-to-outer rotor clearance, and inner rotor ridge clearance; if any clearance is excessive, replace the entire oil pump assembly. Assemble the oil pump, ensuring screws are tightened securely, pack the pump with grease to prime it, and install the oil pressure regulator valve, spring, and washer before tightening the oil pressure regulator valve cap. For installation, reverse the removal process, using new gaskets where applicable on all disassembled parts, align the flats on the crankshaft with those on the oil pump gear, and tighten all fasteners to the specified torque, ensuring to replace the O-rings on the oil pump housing and engine block before installing the oil pan.

Question 2

How to remove and install an oil pump in a 2.4L four cylinder Nissan Frontier?

Accepted Answer

Position the engine at top dead centre of the number one cylinder. Remove the distributor cap and mark the position of the rotor to distributor housing. Remove oil pump attaching bolts and separate pump and driveshaft from engine. If need be, use needle nose pliers to uncouple oil pump driveshaft from crankshaft drive gear. In order to access the oil pump pick-up tube, remove the oil pan. Lift off the pick-up to detach it from engine by removing its mounting bolts. Unbolt oil pump cover(s) from body, then pull out rotors inboard and outboard of it. Inspect for wear or damage all components and clean them thoroughly. Take apart relief valve and check for any damage on it. Then compare results with feeler gauge measurements of oil pump component clearances using same method as before. Go ahead to put together oil pump components followed by pouring clean engine oil into cavity provided for this purpose in oil pump. Next, tighten fasteners after fitting new gasket over cover during assembly process of an oil pump unit. Lower timing chain cover needs a new gasket while installing on a pump bodytowards lower end of an oil pump unit being installed. The aligned marks must be checked after inserting an oil driveshaft into an end portion of an oillpump that is aligned with marks made already as referred above in step 5.To install an oil pump ontothe engine make sure that those aligning marks remain intact and you are good to go.Installation continues with installation of all remainingmounting bolts meant for fixing downoil pumps onto engines.As such, if you removed your sump or took off your pickup tube then put a new gasketon its face back side again and reinstall pan back over wherein it was.If necessary replace old filter with another one which is brand-new; also pour somefreshly added engine-oil inside crankcase." It is time now to start this machine and see if its oil pressure is enough; at thesame time check if there is any leaking. Check engine oil level once again just to be sure.

Question 3

How to remove, inspect, and reinstall the timing belt, crankshaft sprocket, and oil pump assembly on Nissan Maxima with SOHC engine?

Accepted Answer

To have access to the timing belt and crankshaft sprocket, it is necessary to first, strip the oil pan. Subsequently, take out the adjusting bar of the alternator and the bolt that fixes the bar to the oil pump. Take out the bolts of the power steering pump and unbolt it along with the hoses but without disconnecting them and set it aside, then removed the power steering pump bracket. Remove the oil pump to engine block bolts using the caution that you can leave the pickup tube and oil filter adapter connected to the pump if needed. Remove the oil pump gasket seal by striking it with a hammer having the tip of a block of wood on the top of the oil pump gasket seal, then, extract the oil pump from the engine block. Next, scrape and solvent the mating surfaces due to mating. For check, unscrew the bolt that is used to secure the rear cover of the oil pump to the pump, wash the components and check for wear and tear. The oil pressure regulator cap and washer, the spring and the valve should be removed and the condition of the sliding surface and of the spring should be carefully checked; as both the cap and washer, spring and valve are sold only as a complete set, since they are written off together. Using a feeler gauge check the calibration of the respective parts of the oil pump and if the clearance is high change the entire oil pump. Coat the pump in petroleum jelly to prepare the pump for moving the oil; fit the oil pump; and properly fasten the screws. Screw in the oil pressure regulator valve spring followed by the washer and the cap after it had been tightened. It is also recommended to change the O-ring on the flange of the pick-up tube oil and re-attach and tighten the bolts of the pick-up tube. To install, use ATV sealant on the surface that attaches to the oil pump, and replace any components that have been unbolted with new gaskets, and re-establish the reverse of the process of removal. Place the flats on the crankshaft to fit the flats on the oil pump gear, then tighten all bolts.

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