To disassemble this for a 3.7L engine, start at the
Oil Pan, drain/fetch it, remove the oil filter and
Timing Chain cover. Secondly, remove the primary timing chain and slide the crankshaft sprocket off the crankshaft part. Two fasteners need to be removed in order to the oil pump pickup and screen assembly and the three other bolts which secures the oil pump need to be removed. Replace the oil pump with a new one, and tighten the bolts to the standard measure recommended by the manufacturer and replace the oil pump pickup tube together with the screen using a new O-ring. Repeat the removal process in the reverse and then put new oil into the engine and bought a new oil filter to check the leakage of the engine by starting it. As for a 4.0L engine, to make this modification one has to remove both the lower and upper oil pan sections, and this means extracting the engine from the car. To get at the oil pump, first undo the bolts that hold the oil pump in place then take out the oil pump driveshaft. Warm up the pump by pouring fresh oil into one of the ports and spinning it around with your hand. Slide the driveshaft in the engine manner and before it is correctly fixed in position you need to ensure that the travel limit clip is properly fixed firmly. Place the oil pump and the block over a new gasket, and ensure that the driveshaft engages the appropriate place, then tighten the bolts that are related to the oil pump. Complete the process by performing the reverse of the removal procedures, start the engine and the oil pressure should return to normal as quickly as possible with such failure can lead to serious damages on the engine.