Installing SBC Cam Bearings: A Comprehensive Guide

Installing cam bearings is a crucial step in rebuilding or modifying a small block Chevrolet (SBC) engine. These bearings provide support and lubrication for the camshaft, which is responsible for controlling the opening and closing of the valves. Proper installation of the cam bearings is essential for ensuring the engine runs smoothly and efficiently.

Before You Start

Tools and materials you'll need:

• Cam bearing installation tool
• Cam bearing remover tool (optional)
• Clean shop cloth
• Engine assembly lubricant
• New cam bearings
• Camshaft

Step-by-Step Instructions

1. Preparation

• Clean the camshaft journals thoroughly with a clean shop cloth.
• Apply a thin layer of engine assembly lubricant to the camshaft journals.
• Check the new cam bearings for any damage or imperfections.

2. Installing

• Insert a cam bearing into the bearing installation tool.
• Align the bearing with the camshaft journal and carefully guide it into place.
• Tap the installation tool gently with a hammer until the bearing is fully seated.

3. Removal (Optional)

If a cam bearing needs to be removed, use the following steps:

• Obtain or rent a cam bearing removal tool.
• Attach the tool to the bearing and carefully pull it out of the block.

Tips and Tricks

• Use a cam bearing installation tool specifically designed for your SBC engine. This will ensure proper alignment and seating of the bearings.
• Do not reuse old cam bearings, as they may have been damaged during removal.
• Lubricate the camshaft journals thoroughly before inserting the bearings. This will prevent excessive wear during initial startup.
• Check the camshaft endplay after installing the bearings. The endplay should be within the manufacturer's specified range.

Common Mistakes to Avoid

• Inserting the bearings without lubrication can cause them to seize or overheat.
• Tapping the bearings too hard can damage them or the camshaft journals.
• Reusing old bearings can lead to premature camshaft wear.

Why It Matters

Properly installed cam bearings ensure that the camshaft rotates smoothly and without excessive wear. This:

• Extends the lifespan of the engine
• Improves engine performance
• **Prevents costly repairs

Comparison of Methods

There are two main methods for installing cam bearings:

The preferred method depends on the individual's skill level and access to tools.

Stories that Teach

Story 1

A mechanic installs new cam bearings without lubricating them. During startup, the bearings seize and the camshaft is damaged. The engine must be completely rebuilt, costing the mechanic thousands of dollars.

Lesson: Always lubricate cam bearings before installation.

Story 2

A DIY enthusiast decides to reuse old cam bearings because they appear to be in good condition. However, during the first drive, the bearings fail and the camshaft is destroyed. The enthusiast must now replace both the camshaft and the bearings, doubling the cost of the repair.

Lesson: Do not reuse old cam bearings, as they may be damaged or worn.

Story 3

A mechanic installs cam bearings using a hammer and a socket. However, the bearings are not seated properly and the camshaft wobble excessively. The engine runs rough and the owner is forced to have it repaired by a professional mechanic.

Lesson: Use a proper cam bearing installation tool to ensure proper alignment and seating.

Effective Strategies

• Buy high-quality cam bearings from a reputable manufacturer.
• Follow the manufacturer's instructions carefully during installation.
• Use the appropriate tools and techniques to ensure proper seating of the bearings.
• Check the camshaft endplay after installing the bearings to ensure it meets the manufacturer's specifications.

Benefits

Installing cam bearings properly offers several benefits, including:

• Improved engine performance and efficiency
• Extended lifespan of the camshaft and engine
• Reduced risk of costly repairs

Conclusion

Installing cam bearings in an SBC engine is a critical task that requires proper preparation, attention to detail, and the use of appropriate tools and techniques. By following the steps outlined in this guide, you can ensure that your cam bearings are installed correctly, resulting in a well-functioning engine that will provide years of reliable performance.