Tools You'll Need:
* Socket Set: Including deep well sockets in the appropriate size for your glow plugs. The size varies depending on the year of the truck, but common sizes are 10mm, 12mm, and even 14mm.
* Wrench: A wrench that matches your socket size for added leverage.
* Glow Plug Socket: This is crucial. A standard socket will likely round off the glow plug, making removal impossible. You need a glow plug socket specifically designed for these, often with a built-in hex or other shape to grip the glow plug properly. These sockets often have a slightly tapered design to help prevent damage to the plug.
* Breaker Bar or Ratchet: For extra leverage when loosening stubborn glow plugs. An air ratchet can significantly speed up the process.
* Penetrating Oil (like PB Blaster or Liquid Wrench): Soak the glow plugs liberally before attempting to remove them. Let it sit for several hours, even overnight.
* Torque Wrench: Absolutely essential to avoid over-tightening the new glow plugs, which can easily damage the threads.
* Gloves: Protect your hands from grease and potential burns.
* Shop Rags: For cleaning.
* New Glow Plugs: Make sure you get the correct ones for your engine.
* Optional but helpful: Anti-seize compound for the new glow plugs.
Procedure (General Outline):
1. Disconnect the Battery: This is crucial for safety.
2. Access the Glow Plugs: This typically involves removing some parts of the intake system, possibly the valve covers, and possibly other components, depending on your year and truck configuration. Your repair manual is key here.
3. Apply Penetrating Oil: Generously spray penetrating oil onto each glow plug. Let it soak for several hours or overnight. Reapply as needed.
4. Remove the Glow Plugs: Carefully use the glow plug socket and breaker bar or ratchet to remove each glow plug. They can be extremely stubborn. Work slowly and patiently to avoid stripping the glow plug or damaging the cylinder head. If a glow plug breaks, you'll need professional help.
5. Clean the Holes: Use compressed air to blow out any debris from the glow plug holes.
6. Install the New Glow Plugs: Apply a thin coat of anti-seize compound to the threads of the new glow plugs. Screw them in by hand until snug, then use the torque wrench to tighten them to the manufacturer's specified torque. Over-tightening is a common mistake and can easily damage the threads.
7. Reassemble Everything: Carefully reinstall all the parts you removed, making sure everything is properly seated and tightened to the correct specifications.
8. Reconnect the Battery: Once everything is back together.
9. Test the Glow Plugs: Start your truck to confirm that the glow plugs are working correctly and that there are no issues.
Important Considerations:
* Broken Glow Plugs: If a glow plug breaks off in the cylinder head, you'll likely need professional help to remove the broken piece. This is a much more serious problem.
* Torque Specifications: Following the correct torque specifications is absolutely critical to avoid damaging the engine. Consult your repair manual.
* Year-Specific Differences: The exact procedure and accessibility will vary slightly depending on the year of your 7.3L Powerstroke. Always consult a repair manual specific to your truck.
This is a simplified overview. Attempting this repair without proper knowledge and tools can lead to significant engine damage. If you are not comfortable performing this repair yourself, it's best to take your truck to a qualified mechanic.
