Here's a general guide. Specifics may vary slightly depending on the engine (e.g., 4.3L V6, 5.7L V8, etc.) in your G20. Consult a repair manual specific to your vehicle's engine for precise details and diagrams.
Tools You'll Need:
* New serpentine belt: Get the correct size and type. Your local auto parts store can help you identify the correct one based on your van's VIN or engine.
* Socket wrench set: Various sizes, likely including metric.
* Wrench set: Both metric and standard sizes.
* Ratchet: A good quality ratchet will make the job much easier.
* Extension(s): To reach tight spots.
* Pliers: Needle-nose pliers might be helpful.
* Jack and jack stands (highly recommended): To safely lift the van and provide support.
* Wheel chocks: Essential for safety.
* Gloves: To protect your hands.
* Shop rag or paper towels: To clean up any spills or grease.
* Possibly a belt tensioner tool: Depending on your specific engine, you might need a specialized tool to release tension on the belt tensioner. Some can be loosened with a wrench, others require a specific tool.
Steps:
1. Prepare the vehicle: Park on a level surface, engage the parking brake, and chock the wheels. Lift the front of the van using a jack and secure it safely on jack stands. This provides easier access and crucial safety.
2. Locate the serpentine belt: Identify the serpentine belt that runs around the various pulleys (alternator, power steering pump, water pump, etc.).
3. Identify the tensioner pulley: This is the pulley that allows you to relieve tension on the belt. It may be spring-loaded or have a locking mechanism. This is crucial for removing the belt. This is the step that varies most between engines. Your repair manual will show you the exact location and method to release the tension.
4. Release the tension: Carefully use the appropriate tool (wrench or specialized tensioner tool) to release the tension on the tensioner pulley. This will allow you to loosen the serpentine belt from the pulleys.
5. Remove the old belt: Once the tension is released, carefully guide the belt off the pulleys. Pay close attention to the routing of the belt. Take pictures or make a diagram if needed.
6. Install the new belt: Carefully route the new belt around all the pulleys in the same order as the old one. Make sure it sits properly in all the grooves.
7. Release tension and test: Once the new belt is in place, slowly release the tension on the tensioner pulley. The belt should now be snug against all pulleys.
8. Check tension: Check the tension of the new belt by gently pushing on it between pulleys. There should be some give, but it shouldn't be overly loose. Consult your repair manual for recommended tension.
9. Lower the vehicle: Carefully lower the van from the jack stands.
10. Start the engine and check: Start the engine and listen for any squealing or unusual noises from the belt. Visually check that the belt is running correctly.
Important Notes:
* Repair Manual: A repair manual specific to your 1992 Chevrolet G20 with the correct engine is highly recommended. It will provide detailed diagrams and instructions.
* Safety: Always prioritize safety. Working under a vehicle supported only by a jack is extremely dangerous. Use jack stands.
* Tension: Incorrect belt tension can lead to premature belt wear or damage to other components. Refer to your repair manual for the correct tension.
* Parts: Make sure you get the correct serpentine belt for your specific engine.
If you are not comfortable performing this repair yourself, it's best to take your vehicle to a qualified mechanic. This job is relatively straightforward but requires some mechanical knowledge and the right tools. Improper installation can lead to serious problems.
