Here's a general procedure. However, consult your car's repair manual for the *precise* routing diagram for your specific engine. The routing can vary slightly even within the same model year. Getting it wrong can damage your engine components.
Tools You'll Need:
* New serpentine belt (the correct size is crucial!)
* Socket wrench set
* Possibly a ratchet and extensions (depending on accessibility)
* Possibly a belt tensioner tool (sometimes you can use a pry bar, but a tool is safer)
* Gloves (to protect your hands)
Steps:
1. Identify the Routing: Find a diagram in your repair manual showing the correct belt path. This is the *most critical* step. The diagram will show which pulley the belt goes to first, then second, and so on. It's usually a specific clockwise or counter-clockwise order.
2. Loosen the Tensioner: The serpentine belt's tension is typically controlled by a tensioner pulley. This pulley is spring-loaded and must be loosened to allow you to slip the belt on. Locate the tensioner (it often has a bolt that you can loosen). Again, your repair manual will show you exactly where it is and how to access it. Some tensioners require a special tool; others can be manipulated with a pry bar (carefully!) – use the method shown in your repair manual.
3. Install the Belt: Starting at the crankshaft pulley (usually the largest pulley), carefully route the belt around each pulley according to the diagram. Make sure the belt sits correctly in the pulley grooves. It should fit snugly.
4. Tighten the Tensioner: Once the belt is around all the pulleys, slowly tighten the tensioner pulley bolt back to its original position. This will put the belt under tension.
5. Check the Belt Tension: After tightening, try to twist the belt by hand approximately 90 degrees. If it’s too tight you will barely be able to twist it, If it's too loose you will be able to twist it too easily. Adjust as needed (You may need to slightly loosen and re-tighten the tensioner).
6. Verify Rotation: Start the engine and carefully check the belt's rotation. Ensure it runs smoothly and doesn't jump off any pulleys. Listen for any squealing noises, which often indicate poor belt tension or routing.
7. Double-Check: After a short run, stop the engine and visually check the belt for proper seating and condition.
Important Warnings:
* Safety First: Disconnect the negative battery terminal before starting any work on the engine.
* Repair Manual: Always consult your car's repair manual. Generic instructions may not be suitable for your specific vehicle.
* Tensioner Tool: Using a pry bar on the tensioner is risky and can damage the tensioner. The appropriate tool is recommended.
* Belt Size: Ensure you have the correct belt size. Using the wrong size can lead to premature belt wear and damage to the engine.
If you are not comfortable performing this task, take your car to a qualified mechanic. Improper belt installation can cause significant engine damage.
