Installation isn't straightforward and requires careful attention. Here's a general outline; however, consult a repair manual specific to your 1991 Chevy S10 for detailed instructions and torque specifications. This process is best done with the truck's battery disconnected for safety.
1. Access the Starter: You'll need to remove the S10's starter motor. This typically involves disconnecting the battery cables, removing bolts holding the starter in place, and possibly maneuvering past other components. The exact procedure depends on your specific engine and transmission.
2. Assess the Situation: Before installing shims, carefully examine the existing situation.
* Check for existing shims: Note how many, and their thickness.
* Observe the engagement: Inspect the engagement of the starter gear with the flywheel teeth. Is it too far? Too close? Are teeth damaged? This will guide your shim adjustment.
3. Shim Selection: Shims come in various thicknesses. Choose the appropriate shim(s) to correct the engagement. Adding a shim moves the starter *further* away from the flywheel. Removing a shim moves it *closer*.
4. Shim Installation: Shims are typically thin metal plates. They are placed between the starter and the engine block or starter mounting bracket, depending on your truck's setup. Ensure they're clean and placed flat. The number and thickness will depend on your assessment from step 2.
5. Reinstall the Starter: Carefully reinstall the starter motor, ensuring all bolts are tightened to the manufacturer's specified torque.
6. Test and Re-adjust (If Necessary): Reconnect the battery. Attempt to start the engine. If the starter still doesn't engage properly or makes unusual noises, you may need to repeat steps 2-5 with different shims.
Important Considerations:
* Measuring: Some mechanics use a feeler gauge to precisely measure the gap between the starter gear and flywheel teeth *before* adding or removing shims for more accurate adjustment.
* Torque Specifications: Using the correct torque when re-attaching the starter is crucial. Over-tightening can damage the starter or engine block. Always refer to your repair manual.
* Safety First: Always disconnect the battery before working on the starter motor. This prevents accidental short circuits.
* Professional Help: If you're uncomfortable working on your vehicle's starter, it's best to seek professional help from a qualified mechanic. Incorrect adjustment can lead to starter damage or even engine damage.
This information is for guidance only. Always refer to a repair manual specific to your 1991 Chevy S10 for precise instructions and safety precautions. A Haynes or Chilton manual for your specific model year will be invaluable.
