About the 855 Cummins Engine
The 855 Cummins engine is a popular choice in the heavy-duty trucking industry. Known for its durability and reliability, this engine has been a staple in the market for many years. Manufactured by Cummins, a leading provider of diesel engines, the 855 Cummins engine offers impressive power and performance.
Head Bolt Torque Specifications
To ensure proper installation and secure the cylinder head to the engine block, it is crucial to tighten the head bolts to the recommended torque specifications. Here are the head bolt torque specifications for the 855 Cummins engine:
| Bolt Size | Torque Specification (ft. lbs.) | Torque Specification (Nm) |
|---|---|---|
| 7/16″ | 90-100 | 122-136 |
| 1/2″ | 130-140 | 176-190 |
| 9/16″ | 170-180 | 230-244 |
Steps to Torque the Head Bolts
To properly torque the head bolts on the 855 Cummins engine, follow these steps:
1. Clean the threads: Ensure the threads on the head bolts and engine block are clean and free from any debris or oil. This will help achieve accurate torque readings.
2. Lubricate the bolts: Apply a thin layer of engine oil or assembly lubricant to the threads and washer face of each head bolt. This will help reduce friction during tightening.
3. Tighten in sequence: Start by hand-tightening each head bolt, then use a torque wrench to tighten them in the specified sequence. Gradually increase the torque in multiple steps until reaching the recommended torque specification.
4. Repeat the sequence: After reaching the specified torque, repeat the tightening sequence one more time to ensure uniform clamping force across all head bolts.
5. Verify torque: After completing the torque process, double-check the torque on each head bolt using a torque wrench. This will ensure that all bolts are properly tightened.
By following these steps and using the recommended torque specifications, you can ensure that the head bolts on your 855 Cummins engine are properly secured, minimizing the risk of leaks or engine damage.
Conclusion
The 855 Cummins engine is a reliable and powerful choice for heavy-duty applications. When it comes to torquing the head bolts, it is essential to follow the recommended specifications to ensure a secure and leak-free installation. By adhering to the proper torque values and using the correct tightening sequence, you can maintain the integrity and performance of your 855 Cummins engine.