Nissan 31340-1XF0A Oil Pump Assy

You can Select Your Vehicle to check if 31340-1XF0A fits your vehicle.

The oil pump is located inside the timing chain cover and is driven by the crankshaft. Begin by removing the timing chain cover, followed by the oil pump cover-to-oil pump body retaining fasteners, then disassemble the inner and outer rotors, taking care with these components as their close tolerances are critical for maintaining correct oil pressure; any nicks or damage will necessitate replacing the complete pump and timing chain cover assembly. Clean all components, including the timing chain cover and engine block gasket surfaces, with solvent, and inspect for excessive wear or damage. Disassemble the relief valve by removing the cap, washer, spring, and regulator valve, then check the oil pressure regulator valve sliding surface and valve spring; if either is damaged, they must be replaced as a set. If no damage is found, reassemble the relief valve parts, coating them with clean engine oil, and reinstall in the oil pump cover. Check the oil pump component clearance with a feeler gauge and compare the results; if any measurements are out of specification, replace both the timing chain cover and the oil pump components. Assemble the oil pump components, ensuring the punch marks on each rotor face away from the timing chain cover and toward the engine, then pour clean engine oil into the pump cavity and around the rotors before installing the cover to the pump body and tightening the fasteners to the specified torque. Install the timing chain cover using a bead of RTV sealant on the cover-to-block surface, aligning the flats on the inner oil pump rotor with the crankshaft during installation. Proceed to install the cylinder head and other components, followed by the oil pan, a new oil filter, and adding engine oil to the crankcase. Finally, start the engine and check for oil pressure and leaks, then recheck the engine oil level.

This procedure only applies to 2.5L engines, as the oil pump in 2.0L engines is an integral part of the oil pan and cannot be removed or replaced separately; if there is an issue with the oil pump, the upper oil pan must be replaced. The oil pump is located inside the timing chain cover and is driven by the crankshaft. Begin by removing the timing chain cover, then take out the retaining fasteners for the oil pump cover and disassemble the inner and outer rotors, being cautious with these components due to their critical tolerances for oil pressure. Clean all components, including the timing chain cover and engine block gasket surfaces, with solvent and inspect for excessive wear or damage. Disassemble the relief valve and check the oil pressure regulator valve and spring; if damaged, replace them as a set. If no damage is found, reassemble the relief valve parts with clean engine oil. Check the oil pump component clearance with a feeler gauge and replace both the timing chain cover and oil pump components if any measurements are out of specification. Assemble the oil pump components, ensuring the punch marks on each rotor face away from the timing chain cover, then pour clean engine oil into the pump cavity and around the rotors before installing the cover and tightening the fasteners. Install the timing chain cover with RTV sealant on the cover-to-block surface, aligning the flats on the inner oil pump rotor with the crankshaft. Proceed to install the cylinder head and other components, followed by the oil pan, a new oil filter, and adding engine oil to the crankcase. Finally, start the engine to check for oil pressure and leaks, and recheck the engine oil level.

Remove the oil pressure regulator cap, washer, spring(s), and valve, and check the oil pressure regulator valve sliding surface and valve spring. If either is damaged, they should be replaced as a set.

Install the oil pan, a new oil filter, and add engine oil to the crankcase. Start the engine to check for oil pressure and leaks, perform any necessary re-learn procedures, and recheck the engine oil level.