Hope this helps, as I typed it.
1979 Factory Jeep Service Manual
Oil Pump
The positive-displacement gear type oil pump is driven by the distributory shaft, which is driven by a gear on the camshaft. Crankcase oil is drawn into the pump by an inlet tube and screen assembly which is pressed into the pump body (figure 1b-30). The pump incorporates a non-adjustable pressure relief valve to regulate maximum pressure. A setting of 75 pounds maximum pressure is built into the tension of the spring. In the relief position, the valve permits oil to bypass through a passage in the pump body to the inlet side of the pump.
Removal
Note: Oil pump removal or replacement will not affect distributor timing as the distributor drive gear remains in mesh with the camshaft gear.
- Drain engine oil
- Remove oil pan.
- Remove oil pump retaining screws, oil pump and gaskets
Caution: Do NOT disturb position of the oil inlet tube and screen assembly in the pump body. If tube is moved within pump body, a replacement tube and screen assembly must be installed to assure an airtight seal.
Assembly and Installation
- Install oil pressure relief valve, spring, retainer and cotter pin.
- If position of inlet tube in pump body has been disturbed, install replacement tube and screen assembly. Apply light film of Permatex No 2, or equivalent around end of tube. Use tool J-21882 to drive tube into body, making sure support bracket is properly aligned (fig 1B-34)
- Install idler shaft, idler gear, and drive gear assembly.
Note: To ensure self-priming of the oil pump, fill pump with petroleum jelly before installing the oil pump cover. Do not use grease.
4. Install pump cover and replacement gasket. Tighten cover screws to 70 inch pounds torque.
