PM40004273 Rear Crankshaft Seal

PM40004273 Rear Crankshaft Seal

The Cummins PM40004273 rear crankshaft seal is a precision-engineered oil seal designed to prevent leakage and protect critical engine internals. Durable, reliable, and OEM-quality, this seal ensures optimal performance and longevity for Cummins engines.

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Description

Introduction

The Cummins PM40004273 rear crankshaft seal plays a vital role in maintaining engine integrity by preventing harmful oil leaks at the crankshaft exit. As an engine expert, I’ll walk you through its specifications, applications, installation techniques, and troubleshooting tips—ensuring you gain a comprehensive understanding of this essential component.

 

1. Product Overview & Specifications 🔧

Firstly, the PM40004273 is a high-quality rear crankshaft oil seal used in Cummins engines, particularly in heavy-duty diesel applications. While Cummins Part Number 5528553 is often associated with Stage 5 ISB/QSB engines, aftermarket alternatives like part 5259499 feature a dry-seal design with dimensions ~4.97″ ID × 5.92″ OD × 0.49″ width. Therefore, ensure you confirm the correct dimensions and OEM standards before ordering.

2. Purpose & Engine Compatibility

This seal’s primary function is to:

  • Prevent oil leakage by forming a tight barrier around the crankshaft.

  • Protect internal components from contamination.

  • Extend engine lifespan by maintaining proper lubrication.

Cummins engines—ranging from L10 and ISB/QSB series to larger heavy-duty variants—commonly use modular rear crank seals, making PM40004273 suitable for multiple engine platforms.

3. Professional Installation Tips

Installing the PM40004273 correctly ensures long-term performance:

  1. Prepare the crankshaft area: Clean thoroughly and inspect for wear.

  2. Use a seal driver tool: Press seal flush to housing without tilting.

  3. Torque fasteners appropriately: Follow engine manual torque specs.

  4. Run engine briefly: Check for leaks immediately after installation.

  5. Recheck after hours: Ensure stable housing and no seepage.

These steps align with Cummins OEM manuals and engine rebuild standards

4. Troubleshooting & Maintenance

Leaks around the seal often indicate:

  • Incorrect installation (e.g., misalignment or debris).

  • Excessive crankshaft wear, which may require a sleeve.

  • Degraded housing surface, suggesting re-machining.

Regularly monitor for minor seepage and proactively replace the seal during major engine service cycles to avoid catastrophic oil loss.

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Conclusion

In summary, the Cummins PM40004273 rear crankshaft seal is a critical OEM-quality component designed for durability and precision. It effectively stops oil leaks, protects engine internals, and ensures reliable performance across various Cummins engine types. Proper installation and regular maintenance are key; if done right, this seal will keep your engine running smoothly for years.

More info about Cummins PM40004273 rear crankshaft seal, please visit our official website: www.best-cummins.com

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