Conquer the Challenge: A Comprehensive Guide to Installing SBC Cam Bearings

Installing Small Block Chevy (SBC) cam bearings is a critical step in rebuilding or modifying your engine. These bearings play a vital role in supporting the camshaft and ensuring proper lubrication, making their installation a task that demands precision and attention to detail. This comprehensive guide will equip you with the knowledge and techniques to tackle this project with confidence.

Understanding the Importance of Cam Bearings

Cam bearings are thin, bronze-lined shells that reside in the cylinder block. They provide a stable and low-friction surface for the camshaft to rotate on, preventing excessive wear and ensuring smooth engine operation. Incorrectly installed cam bearings can lead to premature camshaft failure, reducing engine performance and lifespan.

Essential Tools and Equipment

Before embarking on this endeavor, gather the necessary tools:

• Bearing Installer Tool: A specialized tool designed to accurately press the cam bearings into place.
• Micrometer: For measuring the camshaft bearing journal diameters and bearing clearances.
• Bearing Reamer: For enlarging the bearing bores to match the bearing shells' outer diameters.
• Machine Polish: For preparing the bearing bores for a proper seal.
• Loctite or Thread Locker: For securing the cam bearings in place.

Preparations and Measurements

Cleanliness is Paramount: Ensure the cylinder block and camshaft are thoroughly cleaned to remove any debris or contaminants.

Bearing Journal Diameters: Using a micrometer, measure the camshaft bearing journals' diameters. These dimensions will determine the correct bearing sizes.

Installing the Cam Bearings

Step-by-Step Guide:

1. Prepare the Bearing Bores: Use a bearing reamer to enlarge the bearing bores to the appropriate diameter, as per the bearing specifications. Ensure the bores are round and smooth.

   

2. Clean and Apply Loctite: Clean the bearing bores and apply a thin layer of Loctite or thread locker to the bearing shells' outer surfaces.

3. Press the Bearings: Carefully align the bearing shells with the corresponding bores and use the bearing installer tool to press them into place. Ensure the bearings are fully seated and flush with the block surface.

   

4. Check Clearances: Once installed, measure the clearances between the camshaft bearing journals and the cam bearings using a micrometer. Optimal clearance varies depending on engine specifications and camshaft design.

Tips for Success:

• Accurate Measurements: Precisely measure the camshaft bearing journals and bearing bores to ensure a proper fit.

• Lubricate the Tool: Apply a light coating of oil or grease to the bearing installer tool to minimize friction during pressing.

• Press Evenly: Gradually apply pressure to the bearing installer tool, distributing force evenly around the bearing shell.

• Inspect for Damage: After installation, carefully inspect the bearings for any cracks or damage. Replace any damaged bearings promptly.

Troubleshooting and Common Mistakes to Avoid

• Incorrect Bearing Size: Using bearings that are too small or too large can lead to excessive clearance or binding, resulting in premature camshaft failure.

• Insufficient Bearing Bore Surface Finish: Rough or uneven bearing bores can create friction and reduce bearing life. Ensure the bores are properly polished for a smooth surface.

• Improper Loctite Application: Inadequate application or absence of Loctite can cause bearings to loosen or spin, compromising engine performance.

  

• Neglecting Cam Bearing Clearances: Incorrect clearance between the camshaft bearing journals and bearings can result in insufficient lubrication or excessive wear. Always consult engine specifications for proper clearance values.

Conclusion

Installing SBC cam bearings requires meticulous attention to detail and a thorough understanding of engine mechanics. By following the steps outlined in this comprehensive guide, you can confidently tackle this project, ensuring optimal camshaft support and extended engine lifespan. Remember to prioritize cleanliness, accurate measurements, and proper lubrication throughout the process.