Here's a general outline of the process. Specifics might vary slightly depending on your engine (2.3L, 2.9L, 3.0L, or 4.0L V6) and whether you have power steering and/or air conditioning. Always consult a repair manual specific to your year, engine, and options for detailed instructions and diagrams. A Haynes or Chilton manual is a good investment.
Tools you'll likely need:
* Socket set (metric) with various sizes, including deep sockets.
* Wrench set (metric)
* Ratchet
* Extension bars
* Torque wrench (critical for proper tightening)
* Jack and jack stands (essential for safety!)
* Wheel chocks
* Pliers
* Possibly a pulley puller (depends on how stubborn the pulley is)
* New tensioner pulley (make sure it's the correct one for your engine)
* Gloves
* Safety glasses
General Steps (Consult your repair manual for specifics):
1. Safety First: Disconnect the negative battery terminal. Place the vehicle on jack stands after safely jacking it up. Use wheel chocks on the wheels that remain on the ground.
2. Access: Locate the tensioner pulley. It's part of the serpentine belt system. You'll likely need to remove some components to access it fully, possibly including parts of the air intake system or other accessories. Your repair manual will guide you here.
3. Release Tension: This is the most critical and potentially tricky part. Most Ranger tensioners have a bolt that, when loosened, allows you to rotate the tensioner to relieve pressure on the serpentine belt. This will allow you to remove the belt. Be prepared for the belt to spring loose once tension is released. Some tensioners use a different mechanism; consult your manual.
4. Remove the Old Pulley: Once the belt is off, you can remove the old tensioner pulley. This may involve removing bolts holding the pulley to the tensioner assembly. A pulley puller might be needed if the pulley is stuck.
5. Install the New Pulley: Install the new pulley, ensuring it's properly seated and secured with the correct torque specification (found in your repair manual).
6. Reinstall the Belt: Carefully route the serpentine belt back around all the pulleys and components, making sure it sits correctly in all grooves.
7. Re-tighten Tensioner: Tighten the tensioner bolt to the specifications in your repair manual.
8. Check Tension: Ensure the belt has proper tension. You should be able to deflect it slightly with your thumb.
9. Reconnect Battery and Test: Reconnect the negative battery terminal. Start the engine and listen for any unusual noises. Check the belt for proper function and tightness.
Important Considerations:
* Torque Specifications: Using a torque wrench and tightening bolts to the manufacturer's specifications is crucial to prevent damage.
* Belt Condition: While you're replacing the tensioner pulley, inspect the serpentine belt for wear and tear. If it's cracked, frayed, or shows significant wear, replace it as well.
* Repair Manual: This is not a substitute for a proper repair manual. The steps above are general; consult your manual for accurate information specific to your vehicle.
Remember, safety is paramount. If you're not comfortable performing this repair, take your Ranger to a qualified mechanic. Improperly working on your vehicle can lead to injury or further damage.
