1. Gather the necessary tools and materials:
- New oil pump
- Oil pump O-ring
- Oil filter
- Oil
- Oil drain pan
- Funnel
- Wrench
- Socket set
- Screwdriver
- Rags
2. Prepare the vehicle:
- Park the Grand Am on a level surface.
- Engage the parking brake.
- Turn off the engine and allow it to cool down.
- Disconnect the negative terminal of the battery.
3. Drain the oil:
- Place the oil drain pan underneath the oil drain plug, on the bottom of the oil pan
- Loosen the oil drain plug using a wrench and allow all of the oil to drain into the pan
- Replace the drain plug once the oil is drained.
4. Remove the oil filter:
- Locate the oil filter near the top of the engine.
- Loosen the oil filter using an oil filter wrench
- Remove the oil filter and dispose of it properly.
- Apply a thin coat of new oil to the gasket of the new oil filter.
- Screw on the new oil filter and hand-tighten it as much as possible.
- Use the oil filter wrench to tighten it an additional 1/4 to 1/2 turn.
5. Remove the oil pan:
- Place a drain pan under the oil pan.
- Remove the bolts around the perimeter of the oil pan using a wrench or socket set.
- Carefully pry off the oil pan and avoid spilling any remaining oil.
6. Remove the oil pump:
- Locate the oil pump on the front of the engine, underneath the timing cover.
- Remove the bolts that hold the oil pump in place using a wrench or socket set.
- Remove the old oil pump and gasket from the engine block.
- Make sure to remove any debris from the oil pump gasket mating surfaces.
7. Install the new oil pump:
- Apply a thin coat of sealant to the new oil pump gasket.
- Position the new oil pump in place on the engine block and install the mounting bolts.
- Tighten the bolts to the specified torque using a torque wrench.
8. Reinstall the oil pan:
- Apply a thin coat of sealant around the perimeter of the oil pan gasket.
- Carefully position the oil pan against the engine block and install the bolts.
- Tighten the bolts to the specified torque using a torque wrench.
9. Add new oil to the engine:
- Remove the oil fill cap on top of the engine.
- Add new oil to the engine until the dipstick reads "Full."
9. Start the engine:
- Reconnect the negative terminal of the battery.
- Start the engine and let it run for a few minutes.
- Check for any leaks around the oil pan and oil filter.
10. Test drive the Grand Am:
- Take the vehicle for a short test drive to ensure that the oil pressure and warning light are functioning properly.
11. Check for leaks:
- After the test drive, recheck the oil pan and oil filter for any leaks.
By following these steps, you should successfully replace the oil pump on your 1991 Pontiac Grand Am.
