Genuine Nissan Oil Pump

Nissan Pathfinder Oil Pump Parts Questions & Experts Answers

• Q: How to remove and install an oil pump in a 2.4L four cylinder Nissan Pathfinder?

  A: Position the engine at TDC for number one cylinder. Remove the distributor cap and mark the position of the rotor to the distributor body. Remove the oil pump mounting bolts and detach the pump and the oil pump driveshaft from the engine. Use needle-nose pliers if necessary to disengage the oil pump driveshaft from the drive gear on the crankshaft. Remove the Oil Pan to access the oil pump pick-up tube. Remove the pick-up mounting bolts and detach it from the engine. Remove the bolt(s) retaining the oil pump cover to the oil pump body, then lift out the inner and outer rotors. Clean all the components and inspect for wear and damage. Disassemble the relief valve and check for any damage. Check the oil pump component clearance with a feeler gauge and compare the results. Assemble the oil pump components and pour clean engine oil into the pump cavity. Install the cover with a new gasket and tighten the fasteners. Install a new oil pump-to-lower timing chain cover gasket on the pump body. Insert the oil pump driveshaft into the end of the oil pump and align the marks. Install the oil pump on the engine with the marks aligned. Verify that the distributor rotor is aligned with the marks made earlier. Install the remaining oil pump mounting bolts and tighten them. If the oil pick-up tube was removed, reinstall it with a new gasket and reinstall the oil pan. Install a new oil filter and add engine oil to the crankcase. Start the engine and check for oil pressure and leaks. Recheck the engine oil level.
• Q: How to remove and install the oil pump on 3.5L V6 Nissan Pathfinder?

  A: Remove the primary Timing Chain and the crankshaft sprocket. It is not necessary to remove the camshaft sprockets, the camshaft sprocket bolts, the secondary timing chains or the primary timing chain tensioner pivot arm/chain guide during this procedure. Simply pivot the tensioner arm/chain guide over to the left side to allow removal of the oil pump housing. Remove the Oil Pans. Remove the oil pump pick-up tube. Remove the oil pump-to-engine block bolts from the front of the engine. Gently pry the oil pump housing outward enough to clear the dowel pins on the engine block and remove it from the engine. Use a large Phillips screwdriver to remove the screws holding the front cover on the oil pump housing. Clean all components with solvent, then inspect them for wear and damage. Remove the oil pressure regulator cap, washer, spring(s) and valve. Check the oil pressure regulator valve sliding surface and valve spring. If either the spring or the valve is damaged, they must be replaced as a set. Check the clearance of the following oil pump components with a feeler gauge and compare the measurements to the specific clearances: Rotor tooth tip clearance, Outer rotor-to-body clearance, Cover-to-inner rotor clearance, Cover-to-outer rotor clearance, Inner rotor ridge clearance. If any clearance is excessive, replace the entire oil pump assembly. Pack the pump with petroleum jelly to prime it. Assemble the oil pump and tighten the screws securely. Install the oil pressure regulator valve. spring and washer, then tighten the oil pressure regulator valve cap. Use new gaskets on all disassembled parts and reverse the removal procedure for installation. Align the flats on the crankshaft with the flats on the oil pump gear. Tighten all fasteners to the specific torque. Before installing the oil pan, be sure to replace the O-rings on the oil pump housing and engine block.
• Q: How to remove the oil pump on 3.3L V6 Nissan Pathfinder?

  A: Remove the Timing Belt and crankshaft sprocket, then take off the Oil Pan. Remove the alternator and its brackets from the engine. Unbolt the power steering pump without disconnecting the hoses and position it aside, then remove the power steering pump bracket. Detach the oil pick-up tube support bracket from the engine's bottom, remove the bolts securing the pick-up tube to the oil pump, and take out the oil pick-up tube. Remove the oil pump-to-engine block bolts from the front and detach the pump from the engine. Pry the oil pump outward to break the gasket seal and remove it from the dowels on the engine block. Use a scraper to clean old gasket material and sealant from the mating surfaces, then clean them with lacquer thinner or acetone. Remove the screws holding the rear cover on the oil pump and lift the cover off. Clean all components with solvent and inspect for wear and damage. Remove the oil pressure regulator cap, washer, spring, and valve, checking the sliding surface and spring; replace them as a set if damaged. Check the clearance of oil pump components with a feeler gauge and compare measurements to specific clearances; replace the entire oil pump assembly if any clearance is excessive. Pack the pump with petroleum jelly to prime it. Assemble the oil pump, tighten the screws, and install the oil pressure regulator valve, spring, and washer, securing the cap. Install the oil pump-to-block gasket over the dowels on the engine block, align the crankshaft flats with the oil pump rotor, position the oil pump on the engine block, and install the mounting bolts, tightening all fasteners to the specific torque. Replace the O-ring on the flange of the oil pick-up tube and reinstall it, tightening the bolts to the specific torque. Complete the installation by reversing the removal steps, ensuring to reinstall the rubber end seals between the oil pump and the lower timing belt cover.