LS Main Bearing Clearance: What You Need to Know
LS Main Bearing Clearance: What You Need to Know
Introduction
When it comes to building a high-performance engine, LS main bearing clearance is a critical factor to consider. LS main bearing clearance is a term used to describe the gap between the crankshaft journals and the main bearings. This gap is necessary to allow for proper lubrication and heat dissipation, but it must also be within a specific range to ensure optimal engine performance and longevity. Too much clearance can lead to excessive bearing wear and oil loss, while too little clearance can result in bearing seizure and catastrophic engine failure.
Benefits of Optimal LS Main Bearing Clearance
- Reduced Bearing Wear: Optimal LS main bearing clearance minimizes friction between the crankshaft journals and the bearings, reducing wear and extending bearing life.
- Improved Oil Flow: Proper LS main bearing clearance allows for adequate oil flow to the bearings, ensuring proper lubrication and heat dissipation.
- Increased Engine Power: Reducing bearing friction and improving oil flow can contribute to increased engine power and efficiency.
How to Measure and Adjust LS Main Bearing Clearance
Measurement
- Remove the oil pan and carefully inspect the main bearings.
- Use a dial indicator to measure the gap between the crankshaft journals and the bearings at several points around the circumference.
- Record the measurements and compare them to the manufacturer's specifications.
Adjustment
- If the LS main bearing clearance is within specifications, no adjustment is necessary.
- If the clearance is too large, the bearings may need to be replaced with thicker ones.
- If the clearance is too small, the crankshaft journals may need to be ground down slightly.
Common Mistakes to Avoid
- Using Incorrect Bearings: Installing bearings with the wrong size or clearance can lead to premature failure.
- Improper Installation: Improper bearing installation techniques can create excessive clearance or binding.
- Neglecting Oil Changes: Regular oil changes are essential for maintaining proper LS main bearing clearance and preventing premature wear.
Tables
LS Main Bearing Clearance Specifications
| Engine | Main Bearing Clearance |
|---|---|
| LS1 | 0.0024-0.0028 inches |
| LS2 | 0.0024-0.0028 inches |
| LS3 | 0.0024-0.0028 inches |
Consequences of Incorrect LS Main Bearing Clearance
| Clearance Issue | Consequences |
|---|---|
| Excessive Clearance | Bearing wear, oil loss, reduced engine power |
| Insufficient Clearance | Bearing seizure, catastrophic engine failure |
FAQs About LS Main Bearing Clearance
Q: What is the recommended LS main bearing clearance for a street performance engine?
A: Typically between 0.0024 and 0.0028 inches.
Q: How often should I check my LS main bearing clearance?
A: Every 50,000-75,000 miles, or as recommended by the engine builder.
Q: Can I adjust LS main bearing clearance myself?
A: It is not recommended unless you have the necessary tools and experience. Consult a qualified mechanic if you are unsure.
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