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 the primary timing chain tensioner pivot arm/chain guide; simply pivot the tensioner arm/chain guide to the left to allow for 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, detaching the oil strainer from the oil pump and removing the oil pump housing retaining 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 out the screws holding 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, tightening the screws securely, and pack the pump with grease to prime it. Install the oil pressure regulator valve, spring, and washer, then tighten the oil pressure regulator valve cap. For installation, reverse the removal process, using new gaskets where applicable on all disassembled parts, aligning the flats on the crankshaft with the flats on the oil pump gear, and tightening all fasteners to the specified torque. Before installing the oil pan, ensure to replace the O-rings on the oil pump housing and engine block.
Posted by NissanPartsDeal Specialist 
