How to Install SBC Cam Bearings: A Comprehensive Guide

Installing small block Chevrolet (SBC) cam bearings is a crucial step in engine assembly. Precision and attention to detail are essential to ensure the proper alignment and longevity of the camshaft. This comprehensive guide will provide you with step-by-step instructions, tips and tricks, and common mistakes to avoid, empowering you to successfully install SBC cam bearings.

Choosing the Right Cam Bearings

The type of cam bearings you need depends on your specific engine application. Consider the following factors when selecting bearings:

• Diameter: Bearings must match the diameter of your camshaft.
• Width: Bearings vary in width to accommodate different camshaft grinds.
• Material: Common materials include bronze, aluminum, and steel. Each material has its own advantages and disadvantages.

Tools and Materials Required

• Cam bearing installation tool
• Bearing driver
• Soft mallet
• Oil
• Cleaning solvent
• Rags
• Micrometer
• Cam bearing gauge

Step-by-Step Installation

1. Preparation

• Clean the camshaft and bearing surfaces thoroughly with a solvent.
• Oil the camshaft and bearing surfaces to facilitate installation.

2. Install the Bearings

• Position the bearing installation tool over the block.
• Place a cam bearing into the tool and align it with the bearing bore.
• Tap the bearing into place with a soft mallet, being careful not to damage the bearing or the block.
• Repeat this process for each bearing.

3. Check the Bearing Depth

• Use a cam bearing gauge to measure the depth of the installed bearings.
• Ensure the bearings are flush with the block surface.
• Adjust the installation tool if necessary to achieve proper bearing depth.

4. Install the Camshaft

• Apply oil to the camshaft journals.
• Carefully insert the camshaft into the block.
• Rotate the camshaft to ensure it moves smoothly within the bearings.

Tips and Tricks

• Lubricate all moving parts liberally throughout the installation process.
• Use a soft mallet to avoid damaging the bearings.
• Check the alignment of the bearings after each step to prevent issues later on.
• Consider using a cam bearing installer to ensure accurate bearing depth.

Common Mistakes to Avoid

• Installing the bearings in the wrong order or orientation.
• Over-tightening the bearing driver, which can damage the bearings.
• Damaging the bearings or block during installation.
• Not checking the bearing depth, which can lead to alignment issues.
• Using the wrong type or size of bearings for your application.

Real-World Stories

Story 1:

Once, a mechanic installed the cam bearings upside down, mistaking the oil groove for the bearing edge. The engine ran for a short time before the bearings seized, causing catastrophic damage.

Lesson: Pay attention to the orientation of the bearings and ensure they are installed correctly.

Story 2:

A DIY enthusiast accidentally over-tightened the bearing driver, causing the bearings to crack. Despite his efforts, the camshaft was now misaligned, resulting in premature wear and poor performance.

Lesson: Use only the recommended torque and follow the installation instructions carefully.

Story 3:

A race engine builder installed the cam bearings without checking their depth. As the engine revved, the bearings shifted, resulting in a complete loss of oil pressure. The engine seized within seconds.

Lesson: Always verify the bearing depth to ensure proper camshaft alignment.

Frequently Asked Questions

1. What is the proper lubrication for SBC cam bearings?
   - Use high-quality engine oil or assembly lube specifically designed for cam bearings.

2. Can I install cam bearings without a bearing installation tool?
   - Yes, but it is not recommended. A proper tool ensures accurate bearing depth and alignment.

3. How often should I replace cam bearings?
   - Replace the cam bearings during any camshaft or engine rebuild. If the engine is in good condition, bearings can generally last for multiple camshaft changes.

4. What are the signs of worn cam bearings?
   - Noisy camshaft or lifters, loss of oil pressure, and excessive camshaft wear.

5. Can I install SBC cam bearings with the engine still in the vehicle?
   - Yes, but it is more challenging and requires special tools.

6. What is the average cost of installing SBC cam bearings?
   - The cost varies depending on the engine make and model, but typically ranges from $100-$300 for labor, excluding parts.

Conclusion

Installing SBC cam bearings requires precision and care, but by following the steps outlined in this guide, you can ensure a successful installation. Remember to choose the correct bearings, prepare the surfaces properly, and verify the bearing depth. With a little practice, you can master the art of installing SBC cam bearings and ensure the longevity of your engine.