Before the plenum/intake manifold removal the valve covers,
Timing Cover, and the
Timing Chains must be noted to be identified afterwards, then the timing chain sprocket is to be removed from the crankshaft. Third, remove the oil pump retaining bolts and pull the pump off of the end of the crankshaft. For inspection you need to remove timing chain guide from the oil pump housing, then remove this housing and pull out the rotors from the pump body as well as removing the cover of the pump. Remove the snap ring of the side of the pump housing and pull out the cap, spring, plunger which constitutes oil pressure relief valve. With the solvent, clean all the parts and then dry them in a dry area; one should then check for signs of wear and tear, for instance, checking the bolt holes for signs of ruined threads and the splined surfaces on the crankshaft sprocket. Any of the components which are scored, scratched, or are worn shall require the replacement of the oil pump assembly since no separate components are available for replacement. If the oil pump is to be reused, attach the components of the pressure relief valve as well as the rotors onto the manifold of the oil pump and then flood the pump using clean engine oil between the rotors before putting on the cover and tightening the retaining bolts. The position the oil pump over the end of the crankshaft sprocket such away that the teeth on the crankshaft sprocket interlock with those on the oil pump drive gear making sure that the oil pump fits neatly against the block. On the oil pump mounting, bolt replace it with the new one and tighten the bolt as per the company recommended torque value. The rest of the installation proceeds in the opposite sequence to the removal. Other things are to put oil and coolant as required other fluids and start the engine and look for signs of any leakage and the oil pressure.