Question 1

How to remove and install the oil pump in 3.6L V6 engine on Jeep Grand Cherokee?

Accepted Answer

Before removing the oil pump the cable should be disconnected from the negative terminal of the battery. Lift the front of the car and securely place it on jack stands, turn on the parking brake and wedge the rear wheels. Suck out the engine oil, next, the fasteners and the lower splash shield should be removed from the vehicle. After that the lower and upper oil pans should be removed, the fastener for the oil pump pick-up tube and the tube should be removed and the O-ring should be thrown away. Remove the oil pump solenoid electrical connector from the engine, even for performing this procedure from the side of the block, the locking tab has to be pressed and the connector inserted into the block around the tensioner mounting bolt. I went further to try and remove the oil pump timing gear splash shield bolts and the splash shield. Extend the oil pump chain tensioner away from the chain so that a 3 mm Allen wrench can fit in to stop it. It is also important to put reference marks on the chain as well as on the oil pump gear by using the permanent marker or paint and when holding the oil pump gear to remove the T45 Torx mounting bolt and the gear. Press out the spring and using your finger, unscrew the tensioner from the oil pump, and then remove the dowel pin and the spring. Last of all, take off the oil pump mounting bolts, and follow this by taking off the pump. For inspection, please remember one key peculiarity: on 3.6L engines, the oil pump is not, in fact, serviceable , if it is faulty, the pump assembly must be changed. The oil pump should be bolted to the engine block and this is done with the dowels provided in the aligning positions with mounting bolts being tightened to the recommended torque. Thread the oil pump chain tensioner on the pivot; push this component against the tension of the spring and place a 3mm Allen key on it to clamp it in position. Centre the oil pump timing chain gear to the oil pump shaft then fit the T45 mounting bolt and tighten to the recommended torque while making sure that the gear is in the right orientation as when it was removed. Turn the oil pump solenoid for the right orientation and engage it through the hole available in the block. Place the timing gear splash shield and fasten the bolts to the prescribed tension. All the other components are installed in the reverse order as by which they were removed. Last but not the least, add the engine oil and replace the oil filter.

Question 2

How to remove and install an oil pump in 4.0L V6 engine on Jeep Liberty?

Accepted Answer

Before removing the oil pump pinch the cable of negative terminal from the battery, then using the jack and jackstands lift the front end of the car so that the front wheels are off the ground and secure it, engage the parking brake and block the rear wheels. The relativist approach to ICCs has been drained of its engine oil and the cooling system, and has excluded the under-vehicle splash shield, the oil pan, the timing belt and the crankshaft sprocket. Then remove the pick-up tube, then the oil pump mounting bolts and oil pump and dispose the pick-up tube O-ring. For testing, clean all parts well in solvent and check for any damages on rotors, pump cover as well as housing; if there is need to replace, do so. Check the oil pump cover for warpage on a straight edge utilising a feeler gauge and if found to be beyond the acceptable warPAGE limit replace the pump. Check the thickness of the outer rotor and the inner rotor and change the pump if either of them is less than the standard amount. Measurements of the clearance between the outer rotor and the housing, and the lobes of the inner and outer rotors, should be taken and if they exceed the maximum allowable limits, the pump should be replaced. Also, ensure the following; the clearance between the surface of the oil pump cover and the rotors, the pump must be replaced if the limit is exceeded. To install, replace the pump cover, apply sealer on the threads of the cover bolts, and tighten the bolts to the required torque value, the sealer should be applied only up to the 1/4 inch of the cover bolt threads. Bolts should be tightened to a particular torque and after doing so, a new O-ring seal must be fitted on the pick-up tube before being installed. Install the timing belt and crankshaft sprocket and put back the other parts in the reverse manner in which they were removed. And, add the engine oil and replace the oil filter as well.

Question 3

How to remove and inspect the oil pump and its components in 3.8L V6 engine on Jeep Wrangler?

Accepted Answer

Remove the oil pan and the timing chain cover, then take off the oil pump cover from the timing chain cover by unscrewing the oil pump cover screws. Clean all parts thoroughly in solvent and inspect the rotors, pump cover, and timing chain cover for any nicks, scratches, or burrs, replacing the assembly if damaged. Use a straightedge and feeler gauge to measure the oil pump cover for warpage; if warped beyond the limit, replace the pump. Measure the thickness of both the outer and inner rotors with a micrometer, replacing the pump if either thickness is below the specified value. Insert the outer rotor into the timing chain cover/oil pump housing and measure the clearance between the rotor and housing with a feeler gauge; if the measurement exceeds the maximum allowable clearance, replace the pump. Install the inner rotor in the oil pump assembly with the chamfer facing the iron pump cover, then measure the clearance between the lobes of the inner and outer rotors; if the clearance is greater than the specified value, replace the pump. Check the clearance between the surface of the oil pump cover and the rotors using a straightedge and feeler gauge; if the clearance exceeds the limit, replace the pump. Install the pump cover and tighten the bolts to the specified torque, then install the timing chain cover and tighten its bolts to the specified torque. Complete the installation of the remaining components in reverse order of removal, and refill the engine with oil while changing the oil filter.

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