1. Preparation is Key:
* Disconnect the Battery: Absolutely crucial to prevent accidental shorts.
* Gather Tools: You'll need a socket set (likely a deep well socket for the starter bolts), a breaker bar or ratchet with extensions, potentially a swivel socket, and possibly a pry bar (use cautiously!). A torque wrench for reinstallation is highly recommended.
* Consult a Repair Manual: A Haynes or Chilton manual for your specific year and model will be invaluable. It'll show you the exact bolt locations, wiring harness connections, and potential clearance issues.
* Safety First: Wear safety glasses and gloves. The area around the engine is hot and potentially greasy.
2. Accessing the Starter:
The difficulty lies in the tight space. Here are the common approaches:
* From the Top (Most Likely): This usually involves accessing the starter bolts from above, between the engine and the firewall. You'll likely need to work with your arms at awkward angles. The use of extensions and a swivel socket will be your best friend here.
* Partial Exhaust Removal (Possibly Necessary): If even with the top approach you can't get enough leverage, you may need to loosen or partially remove sections of the exhaust system (downpipe or parts of the exhaust manifold) to gain the needed clearance. This is a more involved process requiring additional tools and likely a jack and jack stands for safety. Consult your repair manual for the proper procedure; exhaust bolts can be very stubborn.
* Tilt or Remove Related Components (Least Likely but Possible): In extreme cases, you *might* need to slightly loosen and move components like the engine wiring harness to get just enough extra space, but be very cautious with this. Consult your repair manual, as incorrectly manipulating these components could cause serious damage.
3. Removal Procedure (General):
1. Disconnect the Starter Wiring Harness: Carefully disconnect the positive (+) and negative (-) cables from the starter.
2. Remove Starter Bolts: Using your socket and ratchet/breaker bar, carefully remove the bolts securing the starter to the engine block. These bolts can be very tight. Go slow and steady to avoid stripping the bolt heads.
3. Remove the Starter: Once the bolts are out, the starter should be free. You may need to gently wiggle or pry it out, but be careful not to damage anything around it.
4. Reinstallation:
Reverse the steps above. Ensure the starter is properly seated and tighten the bolts to the manufacturer's specified torque. Reconnect the wiring harness.
Important Considerations:
* Rust and Corrosion: Bolts in this area are prone to rust and seizing. Penetrating oil applied several hours before starting the job can help immensely.
* Exhaust Manifold Gasket: If you remove any part of the exhaust system, be prepared to replace the gasket(s).
* Professional Help: If you're uncomfortable with any of these steps, it's best to take your truck to a qualified mechanic. This job can be significantly easier with a lift and specialized tools.
This is a challenging job due to the tight confines of the Duramax engine bay. Be patient, methodical, and prioritize safety. Again, a repair manual tailored to your specific vehicle is crucial for success.
