To replace either belt, you'll need:
* The correct replacement belt(s): Check your owner's manual or a parts store using your VIN to get the exact size and type. Don't guess! The wrong size can damage components.
* A wrench set: You'll need various sizes to loosen and tighten the pulley bolts.
* A socket set: Again, various sizes are likely needed.
* Possibly a belt tensioner tool: Some tensioners require a specialized tool to release tension on the belt. Others can be loosened manually with a wrench. Check a repair manual for your specific model.
* Gloves: Protect your hands.
* A repair manual: This is crucial. It will show you exactly how the belts route, where the tensioners are, and the correct torque specifications for tightening the bolts. A Haynes or Chilton manual is a good investment.
General Steps (Consult your repair manual for specifics):
1. Locate the belts: Identify the power steering pump belt and the serpentine belt (if it drives the water pump).
2. Loosen the tensioner(s): This is the most critical step. The tensioner is a device that keeps the belt taut. You must loosen it to remove the belt. The exact method varies greatly depending on the year and model. Your repair manual will show you where it is and how to loosen it.
3. Remove the old belt(s): Once the tension is released, carefully slip the belt off the pulleys.
4. Install the new belt(s): Route the new belt(s) around the pulleys in the same path as the old one. Make sure it sits correctly in all the grooves.
5. Tighten the tensioner(s): Carefully tighten the tensioner back to its normal position, ensuring the belt is properly tensioned. Over-tightening can damage the belt and bearings. Your repair manual will likely provide a tension specification.
6. Check the belt tension: Manually check that the belt has the correct tension. It shouldn't be too loose or too tight.
7. Start the engine: Once everything is tightened, start the engine and listen for any squealing or unusual noises. If you hear any, shut off the engine immediately and recheck your work.
Important Considerations:
* Safety First: Always disconnect the negative battery terminal before working on the engine.
* Torque Specifications: Tighten all bolts to the manufacturer's specifications. Over-tightening can damage components, while under-tightening can lead to loosening and failure. Your repair manual is essential here.
* Repair Manual: A repair manual is not optional. Working without one increases the risk of damaging your car and potentially injuring yourself.
This is general guidance. The specific procedure depends entirely on your 1994 Nissan Sentra's engine and configuration. Always refer to a repair manual specific to your vehicle before attempting this repair. If you're not comfortable performing this repair yourself, take your car to a qualified mechanic.
