Jeep 53020827AB Pump-Engine Oil

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The timing chains and sprockets are accessed by first setting the motor back, then dropping the oil pan, windage tray and pick-up tube. Subsequently, take out bolts between the primary timing chain tensioner and oil pump, as well as the tensioner itself. Following this, remove the remaining oil pump bolts and then applying a little amount of pressure to the oil pump housing in order to locate the flats of the crankshaft while removing the pump from the engine. To check, firstly remove the cover of the oil pump by unscrewing it and removing it: lift it, then thoroughly clean all the details with solvent and assess the degree of wearing and the presence of damages. Take care here because the oil pressure relief valve and its spring are internally located in the oil pump housing and if removed they will render the pump useless requiring a complete set of pump assembly to be fitted. Check flats of pump cover using a straightedge and a feeler gauge, outer rotor and thickness, thickness of the inner rotor, outer rotor to the body space, the inner rotor to the outer rotor tip, and side clearance. As for any too large measurements, it is recommended to replace the entire oil pump assembly. To prime the oil pump tightly fill the rotor cavities with petroleum jelly and finally tighten all fasteners to manufacture torques. For installation, turn the rotor flats with the crankshaft flats and then snap the oil pump into place against the block. Last, position the primary timing chain tensioner over the oil pump, screw the pump to block bolts then tighten the Oil pump and primary timing chain tensioner bolts to the factory recommended torque in the reverse manner to which it was removed.

Pack the rotor cavities with petroleum jelly, then assemble the pump and tighten all fasteners to the specified torque.

The timing chain cover and the oil pan need to be removed.

The first step is to disconnect the cable from the negative terminal of the battery.