Installing camshaft bearings is a crucial step in rebuilding a small block Chevrolet (SBC) engine. These bearings support the camshaft and minimize friction, ensuring proper engine performance. This guide will provide a step-by-step approach, highlight common mistakes to avoid, and present the benefits of proper cam bearing installation.
Properly installed cam bearings are essential for:
During an engine rebuild, a mechanic accidentally installed the cam bearings upside down. Upon starting the engine, a catastrophic noise occurred. The reversed bearings had starved the camshaft of oil, resulting in severe damage.
Lesson: Always follow the manufacturer's instructions and double-check bearing orientation before installation.
A do-it-yourselfer installed new cam bearings without properly lubricating them. After a few minutes of running, the engine seized due to overheated bearings.
Lesson: Never overlook the importance of lubrication. Always apply assembly lube to all bearing surfaces prior to installation.
A seasoned mechanic installed cam bearings with excessive clearance. While the engine initially ran smoothly, it developed a noticeable rattling noise over time. The loose bearings had allowed the camshaft to move excessively, causing irregular valve timing and reduced performance.
Lesson: Proper bearing clearance is crucial for optimal engine operation. Always verify clearance using a dial indicator and replace any bearings that exceed the recommended tolerances.
Manufacturer | Bearing Material | Clearance Range (in) |
---|---|---|
Clevite | Tri-metal | 0.0015" - 0.0025" |
Federal-Mogul | Steel-backed | 0.002" - 0.003" |
Sealed Power | Bronze | 0.001" - 0.002" |
Bearing Type | Advantages | Disadvantages |
---|---|---|
Plain | Low cost | High friction, limited durability |
Grooved | Improved oil flow | More expensive, more complex installation |
Oilite | Self-lubricating, low maintenance | Limited load capacity, not suitable for high-performance applications |
Clearance | Effect on Performance | Recommendation |
---|---|---|
Tight | Reduced friction, improved performance | May cause premature bearing failure in high-stress applications |
Loose | Increased friction, reduced performance | May allow excessive camshaft movement, causing noise and wear |
Optimal | Minimum friction, optimal performance | Specified by engine manufacturer, typically between 0.001" and 0.003" |
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