Tools You'll Likely Need:
* Socket set and wrenches: Various sizes, including metric and possibly SAE.
* Ratchet and extensions: To reach tight spots.
* Torque wrench: Crucial for tightening bolts to the correct specifications. Improper torque can damage the engine or components.
* Jack and jack stands: For safe vehicle support.
* Wheel chocks: For added safety.
* Pry bar (or similar tool): Might be needed to help release the tensioner.
* Wrench for the tensioner pulley bolt (often a 15mm or 18mm): Check your vehicle!
* New tensioner pulley assembly: Ensure you get the correct part for your specific year and engine.
* Gloves and safety glasses: Protect yourself.
* Possibly a serpentine belt removal tool: This can make removing the belt much easier, but sometimes it can be removed manually by carefully manipulating the tensioner.
General Steps:
1. Safety First: Park the Tahoe on a level surface, engage the parking brake, and use wheel chocks. Raise the front of the vehicle using a jack and securely support it with jack stands. Never work under a vehicle supported only by a jack.
2. Locate the Tensioner Pulley: It's usually located on the driver's side of the engine, near the front.
3. Remove the Serpentine Belt: This is often the most challenging part. Consult your repair manual for the specific routing of the belt. You'll need to release tension on the tensioner pulley to remove the belt. This usually involves turning a bolt on the tensioner pulley using the correct wrench. Some tensioners use a lever-type mechanism while others have a bolt that needs to be rotated. Be aware that the belt might be under considerable tension; use caution. A serpentine belt removal tool can make this easier.
4. Remove the Old Tensioner Pulley: Once the belt is off, you'll need to remove the bolts holding the tensioner pulley assembly in place. These bolts are typically located at the back of the assembly. Again, consult your repair manual for the exact locations and bolt sizes.
5. Install the New Tensioner Pulley: Carefully align the new tensioner pulley with its mounting points and install the bolts. Tighten them to the specifications in your repair manual. Don't overtighten.
6. Install the Serpentine Belt: Route the belt correctly according to your vehicle's repair manual. Ensure that it sits properly in all the pulleys.
7. Lower the Vehicle: Carefully lower the vehicle from the jack stands.
8. Test: Start the engine and listen for any unusual noises. Check that the belt is running correctly and that there are no leaks.
Important Considerations:
* Torque Specifications: Use a torque wrench and follow the torque specifications in your repair manual precisely. Incorrect torque can strip threads or damage components.
* Repair Manual: This is crucial. The exact location, tools, and procedures may vary slightly depending on the specific engine.
* Professional Help: If you're not comfortable performing this repair, it's best to take your Tahoe to a qualified mechanic. Improperly installing the tensioner pulley can lead to serious engine damage.
This detailed process provides a general outline. Always refer to a repair manual specific to your 1999 Chevy Tahoe and its engine for precise instructions and diagrams. Safety is paramount; if you're unsure about any step, consult a professional.
