* Wrench(es): You'll likely need a few different sizes, depending on the size of the bolts holding the belt tensioner and alternator. Check your truck's specific specifications or consult a repair manual to determine the exact sizes. A socket wrench set with various sizes will be very helpful.
* Socket Set: Preferably a metric set as most Ford vehicles from that era used metric fasteners.
* Ratchet: To use with the sockets.
* Extension(s): To reach difficult-to-access bolts.
* Wrench for belt tensioner (if necessary): Some F-150s have an automatic tensioner, requiring no tools beyond possibly a ratcheting wrench to slightly loosen the belt. Others have a manual tensioner requiring a specific wrench, possibly a special tool. Check your truck's setup.
* Gloves: To protect your hands.
* New Drive Belt: Make sure you have the correct size belt. You can find the correct size on the old belt or in your owner's manual or online. Auto parts stores can also help you identify the right one based on your truck's year and engine.
* Jack and Jack Stands (optional but highly recommended): Lifting the front of the truck will give you better access to the belt. Never work under a vehicle supported only by a jack.
* Repair Manual (highly recommended): A repair manual specific to your year and engine will show diagrams and detailed instructions, making the job much easier and safer.
How to Change the Drive Belt:
This is a general guide; the specifics may vary slightly depending on your F-150's exact configuration. Always consult a repair manual for your specific vehicle.
1. Safety First: Disconnect the negative battery terminal. This prevents accidental shorts and protects electrical components. If you're using a jack, secure the vehicle properly on jack stands.
2. Locate the Belt: Identify the serpentine belt. It's the long belt that runs around multiple pulleys (alternator, power steering pump, water pump, etc.).
3. Locate the Tensioner: Find the belt tensioner. This is a device that allows you to loosen the belt to remove and install it. It might be a pulley with a spring or a hydraulic/automatic tensioner. Some tensioners have a bolt to loosen, allowing you to manually rotate the tensioner and relieve belt tension. Others release tension automatically when you apply pressure to a specific point on it.
4. Loosen Tension: Use the appropriate wrench to release tension on the belt tensioner. This will slacken the belt, allowing you to remove it. Note: Be prepared; the belt may spring free quickly once the tension is released.
5. Remove the Belt: Carefully lift the belt off the pulleys, working your way around from one pulley to the next.
6. Install the New Belt: Route the new belt around the pulleys in the same order as the old belt. Make sure it sits correctly on all the pulleys.
7. Release Tensioner (if needed): After placing the belt, if you loosened a bolt, tighten it back.
8. Check Alignment: Ensure the belt is correctly seated on all pulleys, and none are misaligned.
9. Recheck Tension: Once you have everything in place and the tensioner is back to its normal position, gently check that the belt isn't too loose or too tight. A slightly loose belt might make a squealing noise. A too-tight belt might damage the pulleys or bearings.
10. Reconnect Battery: Reconnect the negative battery terminal.
11. Test Run: Start the engine and listen for any squealing or unusual noises. Check the belt for any signs of slippage or wear.
Important Considerations:
* Automatic Tensioners: Many modern vehicles use automatic tensioners. These typically require no tools to release the tension; you merely push or lever on a specific point of the tensioner to relieve pressure. Your repair manual will show this.
* Belt Routing: Pay close attention to the belt routing. If you install it incorrectly, it won't work, and you may damage components. A diagram from your repair manual is invaluable here.
* Pulley Condition: While you're at it, check the condition of the pulleys. Look for cracks or excessive wear.
* Professional Help: If you're unsure about any step, it's always best to seek professional help from a mechanic.
This information is for general guidance only. Always consult your owner's manual or a repair manual specific to your 1999 Ford F-150 for the most accurate and safe procedure.
