Getting your 350 Chevy's starter to engage smoothly is crucial for reliable starts. Sometimes, however, the starter's teeth won't quite mesh with the flywheel's, leading to a frustrating clicking sound instead of the satisfying roar of a fired-up engine. This often points to the need for starter shimming. This guide provides a step-by-step process for accurately shimming your 350 Chevy starter.
Understanding the Need for Starter Shimming
Before diving into the process, let's understand why starter shimming is necessary. The starter's teeth need to perfectly align with the flywheel's ring gear for proper engagement. Several factors can cause misalignment:
- Worn Flywheel Teeth: Over time, the flywheel teeth can wear down, leading to insufficient engagement.
- Incorrect Starter Mounting: Improper installation of the starter itself can cause misalignment.
- Engine Block Warpage: In extreme cases, engine block warpage can subtly affect the starter's position.
- Aftermarket Components: Using aftermarket parts, particularly starters or flywheels, might introduce dimensional inconsistencies.
Assessing the Situation: Diagnosing Starter Issues
Before you start shimming, ensure the problem truly lies with misalignment. Here's how to check:
- Listen Carefully: The telltale sign is a rapid clicking sound when you turn the key. This indicates the starter is trying to engage but can't quite reach the flywheel.
- Visual Inspection (If Possible): If you can access the starter and flywheel, check for obvious misalignment. A gap between the starter and flywheel is a strong indicator.
- Rule Out Other Issues: Check the battery, cables, starter solenoid, and ignition switch. These components can also cause starting problems, and addressing them first will save you time and effort.
Gathering Your Tools and Materials
Before beginning, ensure you have the necessary tools and materials:
- Various Thickness Shims: Starter shims are typically available in various thicknesses (e.g., 0.015", 0.030", 0.060"). Having a range allows for precise adjustment.
- Socket Set: You'll need sockets to remove and install the starter.
- Wrench Set: May be necessary depending on your starter mounting bolts.
- Torque Wrench: Crucial for tightening the starter bolts to the manufacturer's specifications. Over-tightening can damage the starter or engine block.
- Jack and Jack Stands (Recommended): Provides easier access and safety.
- Protective Gear: Safety glasses and gloves are recommended.
Shimming Your 350 Chevy Starter: A Step-by-Step Guide
This process requires care and precision:
- Disconnect the Battery: Always disconnect the negative battery terminal before working on any electrical components. This prevents accidental short circuits and potential damage.
- Remove the Starter: Use the appropriate sockets and wrenches to remove the starter motor from the engine block. Take note of its orientation and any existing shims.
- Inspect the Flywheel: Carefully inspect the flywheel's ring gear for excessive wear. Significant wear may require flywheel replacement rather than just shimming.
- Add Shims: Experiment by adding one or more shims of varying thicknesses behind the starter. The goal is to bring the starter's teeth into perfect alignment with the flywheel. Start with the thinnest shims and incrementally add more until proper engagement is achieved.
- Test Engagement: After each shim addition, carefully reinstall the starter and attempt to start the engine. Listen for the clicking sound; if it persists, you need more shims. If it starts smoothly, you've found the right adjustment.
- Reinstall and Tighten: Once you achieve proper engagement, fully reinstall the starter, ensuring all bolts are tightened to the manufacturer's specifications using your torque wrench.
- Reconnecting Battery: Reconnect the battery's negative terminal.
Troubleshooting and Tips
- Too Much Shim: If the starter engages too forcefully, it could indicate excessive shimming. Reduce the shim thickness in this case.
- Starter Solenoid Issues: Sometimes, even with perfect alignment, a faulty starter solenoid can prevent engagement. Testing the solenoid is crucial.
- Professional Help: If you are uncomfortable with this process, seek professional help from a qualified mechanic.
By following these steps and paying close attention to detail, you can effectively shim your 350 Chevy's starter and resolve those frustrating starting issues. Remember that safety and precision are paramount throughout the entire process.
