Tools You'll Likely Need:
* Socket set: Various sizes, including metric and possibly SAE.
* Wrench set: Same as above.
* Ratchet: Preferably a good quality one.
* Extension(s): To reach difficult bolts.
* Torque wrench: Essential for proper tightening.
* Jack and jack stands: To safely lift the vehicle.
* Wheel chocks: For added safety.
* New serpentine belt tensioner: Get the correct part for your specific engine.
* New serpentine belt (recommended): Since you're already in there, replacing the belt is a good idea to prevent premature wear.
* Gloves and safety glasses: Protect yourself!
* Penetrating lubricant (PB Blaster or similar): To help loosen rusted bolts.
Steps (General):
1. Safety First: Engage the parking brake, chock the wheels, and raise the front of the vehicle securely using a jack and jack stands. Never work under a vehicle supported only by a jack.
2. Locate the Tensioner: The tensioner is usually located on the front of the engine, near the serpentine belt. It may have a spring and a pulley.
3. Remove the Serpentine Belt: This is often the hardest part. You'll need to use a tool to release the tension on the belt. Some tensioners have a bolt that you can turn to release tension, while others have a lever or a tool specifically designed for that engine. Consult your repair manual to identify the correct method for your vehicle. Once the tension is released, the belt should be easy to remove from the pulleys.
4. Remove the Old Tensioner: This usually involves removing bolts holding the tensioner to the engine block. Apply penetrating lubricant if necessary and allow time for it to work. Use the correct sockets and wrenches. Take note of how the tensioner is mounted and the position of any washers or spacers before removing them.
5. Install the New Tensioner: Install the new tensioner, making sure it's oriented correctly. Tighten the bolts to the manufacturer's specified torque (found in your repair manual).
6. Install the New Serpentine Belt (if replacing): Route the new belt correctly around all the pulleys. Make sure it's seated properly in each pulley groove. Again, refer to your repair manual for the correct routing.
7. Lower the Vehicle: Carefully lower the vehicle to the ground.
8. Start the Engine: Briefly start the engine to check for any noises or belt slippage. Inspect the belt for proper tension and routing.
9. Double Check: Ensure all bolts are tightened correctly.
Important Considerations:
* Repair Manual: This is your best friend. It will have diagrams, torque specifications, and specific procedures for your particular model and engine.
* Engine Type: The exact location and method for accessing the tensioner will vary slightly depending on the engine your E-150 has.
* Rust and Corrosion: Older vehicles often have rusted bolts. Use penetrating lubricant generously and be patient. If a bolt breaks, you may need to drill it out.
* Torque Specifications: Over-tightening or under-tightening bolts can cause damage. Use a torque wrench to ensure proper tightening.
If you're not comfortable performing this repair yourself, it's best to take your vehicle to a qualified mechanic. This is not a trivial repair and incorrect installation can lead to further damage.
