Here's a general outline of the process. This is NOT a comprehensive guide, and specific steps may vary. Always consult a repair manual specific to your vehicle year and model for detailed instructions and torque specifications. Those specifications are crucial to avoid damage.
Tools You'll Need:
* Glow plug socket: This is a special socket designed to grip the glow plug without damaging it. It's *essential* to avoid stripping the glow plug.
* Breaker bar or ratchet: To loosen and tighten the glow plug. You'll likely need a good amount of leverage.
* Torque wrench: Absolutely necessary to tighten the glow plug to the correct specification. Over-tightening is a common cause of damage.
* Penetrating oil (like PB Blaster): Apply liberally to the glow plug several hours (or even overnight) before attempting removal to help break free any corrosion.
* Shop rags or towels: To keep the area clean and prevent dropping parts into the engine.
* Safety glasses and gloves: Protect yourself from potential injury.
* Possibly an air compressor: To blow out any debris from the cylinder head after removing the glow plug.
* Repair manual: Highly recommended for detailed instructions and torque specifications.
Steps (General Outline):
1. Safety First: Disconnect the negative battery terminal.
2. Access: Locate cylinder #3. This requires removing parts potentially including air intake components, various wiring harnesses, and potentially the valve cover or at least enough to access the glow plug. Consult your repair manual for precise steps.
3. Penetrating Oil: Generously apply penetrating oil to the glow plug. Allow it to soak for several hours or overnight.
4. Removal: Carefully use the glow plug socket and breaker bar or ratchet to remove the old glow plug. Be prepared for resistance. Avoid stripping the glow plug. If it's stubborn, consider using a heat gun to gently warm the area (be very cautious!).
5. Cleaning: Use compressed air to carefully blow out any debris from the glow plug hole. Inspect the cylinder head for any damage.
6. Installation: Carefully install the new glow plug. Do not over-tighten. Use the torque wrench to tighten the new glow plug to the manufacturer's specified torque.
7. Reassembly: Carefully reinstall all removed parts, ensuring everything is properly connected.
8. Reconnecting Battery: Reconnect the negative battery terminal.
9. Testing: After reassembly, start your vehicle and let it run for a few minutes to ensure the new glow plug is functioning correctly.
Important Considerations:
* Glow Plug Type: Ensure you're using the correct type of glow plug for your 7.3L Power Stroke.
* Torque Specifications: Adhere strictly to the torque specifications found in your repair manual. Over-tightening can easily crack the glow plug or the cylinder head.
* Difficult Removal: If the glow plug is extremely difficult to remove, consider professional assistance to avoid damage. A broken glow plug is significantly more difficult (and expensive) to deal with.
This is a simplified overview. Again, refer to a repair manual specific to your 2002 Ford Excursion 7.3L Power Stroke for detailed, accurate instructions and torque specifications. Improper installation can cause significant engine damage. If you're unsure about any step, seek professional help.
