This outlines the general steps. Always consult a repair manual specific to your vehicle year and engine for detailed instructions, torque specifications, and diagrams. The Haynes and Chilton manuals are good resources.
Tools and Supplies You'll Need:
* Repair Manual: Absolutely essential.
* Jack and Jack Stands: Safety first!
* Wheel Chocks: For added safety.
* Socket Set (Metric): A wide range of sizes.
* Wrenches (Metric): Both open-end and combination.
* Torque Wrench: Crucial for proper tightening.
* Oil Pan Removal Tool: Makes removing the oil pan much easier.
* New Oil Pump: Ensure you get the correct part number for your engine.
* New Oil Pan Gasket: Essential to prevent leaks.
* New Oil Filter: Replace this while you're at it.
* New Oil: The correct weight and quantity for your engine.
* Drain Pan: To catch the old oil.
* Shop Towels: Lots of them!
* Gloves: Protect your hands.
* Pry Bar (Plastic or Wood Preferred): For careful prying.
* Clean Work Area: This will make the job much easier.
General Steps (Highly Simplified):
1. Safety First: Disconnect the negative battery cable. Raise the vehicle securely using jack stands.
2. Drain the Oil: Locate the oil drain plug on the oil pan and drain the oil into a drain pan.
3. Remove the Oil Pan: This is often the most challenging part. You'll likely need to remove various components to access it, including:
* Lower engine splash shield (if applicable).
* Possibly the front differential skid plate.
* Possibly the exhaust manifolds (at least partially).
* Possibly the oil cooler lines (depending on setup).
4. Remove the Oil Pump: Once the oil pan is removed, the oil pump is typically accessible. This usually involves removing bolts holding the pump in place. You'll need to carefully inspect how the pump is attached before removing it.
5. Install the New Oil Pump: Carefully install the new oil pump, ensuring it's seated correctly and all bolts are tightened to the specifications in your repair manual.
6. Install the New Oil Pan Gasket: Apply a thin, even bead of RTV silicone sealant (if specified in your manual) to the new oil pan gasket before installing the pan.
7. Reinstall the Oil Pan: Carefully reinstall the oil pan, ensuring it's properly seated and all bolts are tightened to the correct torque specifications.
8. Reinstall Removed Components: Reinstall all components that were removed to access the oil pump and oil pan.
9. Add New Oil and Filter: Add the correct amount and type of oil. Install the new oil filter.
10. Check for Leaks: Start the engine and let it run for a few minutes, then check for any oil leaks around the oil pan and pump.
Important Considerations:
* Timing Chain: Accessing the oil pump often involves working around the timing chain. Take extreme care not to damage or disturb it. If you're not comfortable with this, strongly consider professional help.
* Torque Specifications: Using the correct torque for all bolts is absolutely crucial. Failure to do so can result in leaks or component failure.
* Cleanliness: Keep everything clean to prevent debris from entering the engine.
Again, this is a highly simplified overview. Refer to a repair manual specific to your 2004 Tahoe with the 5.3L engine for precise and detailed instructions. Improper installation can cause serious engine damage. If you have any doubt about your ability to complete this repair, take your vehicle to a qualified mechanic.
