Here's a general outline of the procedure. Specific steps and tool requirements might vary slightly depending on the exact configuration of your vehicle, so always consult a repair manual specific to your 1993 Cadillac Seville. A Haynes or Chilton manual is a good investment for this type of work.
1. Safety First:
* Disconnect the battery negative terminal. This is crucial to prevent accidental shorts and electrical damage.
* Allow the engine to cool completely. Working on a hot engine is dangerous.
* Wear safety glasses. Broken parts or snapping belts can cause eye injuries.
* Use jack stands. Never work under a vehicle supported only by a jack.
2. Access the Tensioner:
* You'll likely need to remove some components to gain better access to the tensioner. This *might* include removing the air cleaner housing, some plastic covers, and possibly even the upper radiator hose (depending on how much clearance you have). Refer to your repair manual for the precise steps for your vehicle.
3. Identify the Tensioner Release Mechanism:
* The Northstar tensioner usually has a bolt or a special tool to release the tension on the belt. This is the most critical step. There will be either a bolt that needs to be loosened (often using a wrench or socket) or a specific tensioner release tool is required to depress the tensioner. Your repair manual will show you exactly where this mechanism is located and what tool is needed. Do not attempt to force the belt off without releasing the tension; you'll risk damaging the tensioner or other components.
4. Release the Tension and Remove the Belt:
* Once the tension is released, carefully use a flat head screwdriver or similar tool to gently pry the belt off the tensioner pulley *and* the crankshaft pulley.
* Keep track of the belt routing – you'll need to put it back on correctly. Take pictures if necessary.
5. Remove the Tensioner Pulley:
* Now that the belt is removed, the pulley itself should come off relatively easily. There may be a bolt holding it to the tensioner assembly. This bolt will likely need to be removed using a socket wrench.
6. Reassembly:
* Reinstallation is the reverse of the removal process. Be sure to properly route the serpentine belt. Your repair manual will have a diagram showing the correct routing.
Important Notes:
* Repair Manual: This is essential! It will provide precise details, torque specifications for bolts, and diagrams specific to your vehicle.
* Special Tools: You might need specific tools, such as a tensioner release tool.
* Torque Specifications: Always tighten bolts to the manufacturer's specified torque. Over-tightening can damage components, while under-tightening can lead to loosening and potential failure.
If you are not comfortable with any part of this process, it's best to take your car to a qualified mechanic. Improperly working on your vehicle's engine can lead to significant damage and potentially costly repairs.
