Install Cam Bearings SBC: A Comprehensive Guide to Ensure Precision and Performance

Installing cam bearings in a Small Block Chevrolet (SBC) engine is a critical step in ensuring the proper operation and longevity of the camshaft. Cam bearings provide support and alignment for the camshaft, minimizing friction and wear. This article will provide a detailed guide on how to install cam bearings in an SBC engine, covering tools, materials, and step-by-step instructions.

Cam Bearing Basics

Cam bearings are cylindrical inserts made of a durable material such as steel or bronze. They are fitted into the engine block to create a smooth and precise surface for the camshaft to rotate on. The bearings are typically oil-lubricated to reduce friction and prevent overheating.

The number and size of cam bearings vary depending on the engine design. In an SBC engine, there are typically five cam bearings. The bearings are sized according to the diameter of the camshaft.

Tools and Materials

To install cam bearings in an SBC engine, you will need the following tools and materials:

• New cam bearings
• Cam bearing installer
• Hammer or press
• Engine block
• Camshaft
• Engine oil
• Clean rags
• Torque wrench

Step-by-Step Instructions

1. Clean the Engine Block

Before installing the cam bearings, thoroughly clean the engine block to remove any dirt, debris, or old oil. Use a clean rag soaked in engine oil to wipe down the surfaces where the bearings will be installed.

2. Install the Cam Bearings

Apply a small amount of engine oil to the cam bearings. Use a cam bearing installer to carefully press the bearings into the engine block. Make sure the bearings are fully seated and flush with the block surface.

3. Check Bearing Alignment

Once the bearings are installed, check their alignment by inserting the camshaft. The camshaft should slide smoothly through the bearings without any binding or excessive play. If necessary, adjust the bearings to ensure proper alignment.

4. Torque the Cam Bearings

Use a torque wrench to tighten the cam bearing bolts to the specified torque. This will ensure that the bearings are securely in place and will not loosen over time.

5. Install the Camshaft

Once the cam bearings are torqued, install the camshaft into the engine. Apply a thin layer of engine oil to the camshaft lobes and journals. Rotate the camshaft to distribute the oil evenly.

Tips and Tricks

• Use a high-quality cam bearing installer to ensure proper installation.
• Apply a small amount of engine oil to the bearings before installing them.
• Check the bearing alignment carefully before installing the camshaft.
• Torque the cam bearings to the specified torque to ensure secure installation.
• Use a dial indicator to check the cam bearing clearance once the camshaft is installed.

Common Mistakes to Avoid

• Do not overtighten the cam bearing bolts. This can damage the bearings and the engine block.
• Do not install the cam bearings dry. This can cause excessive wear and damage to the bearings and camshaft.
• Do not use a hammer to install the cam bearings. This can damage the bearings and the engine block.

Stories from the Field

1. The Mechanic Who Installed Cam Bearings Upside Down

A mechanic was installing cam bearings in an SBC engine when he accidentally installed one of the bearings upside down. When the engine was started, the camshaft immediately seized up, causing severe damage to the engine.

Lesson learned: Always double-check the orientation of the cam bearings before installing them.

2. The Cam Bearing That Fell Out

A mechanic was installing cam bearings in an SBC engine when one of the bearings fell out of the engine block. He didn't notice the missing bearing and installed the camshaft. When the engine was started, the camshaft failed, causing extensive damage to the engine.

Lesson learned: Always inspect the engine block carefully to ensure that all cam bearings are in place before installing the camshaft.

3. The Overtightened Cam Bearing

A mechanic was installing cam bearings in an SBC engine when he overtightened one of the cam bearing bolts. The bolt snapped, and the cam bearing was damaged. The mechanic had to remove the engine block and replace the camshaft and cam bearings.

Lesson learned: Always use a torque wrench to tighten the cam bearing bolts to the specified torque.

Effective Strategies

• Use a cam bearing installer that is designed specifically for SBC engines.
• Install the cam bearings in a clean and dry environment.
• Check the bearing alignment carefully before installing the camshaft.
• Torque the cam bearings to the specified torque using a torque wrench.
• Use a dial indicator to check the cam bearing clearance once the camshaft is installed.

By following these strategies, you can ensure that your cam bearings are installed correctly and will provide years of reliable service.