About the 2.2 Ecotec Engine
The 2.2 Ecotec engine is a popular powerplant used in various General Motors vehicles. Known for its efficiency and reliability, this engine has gained a reputation for delivering a balance of performance and fuel economy. The 2.2 Ecotec engine features an aluminum cylinder head, which plays a crucial role in sealing the combustion chamber and ensuring proper engine function. To achieve this, it is essential to follow the correct head bolt torque sequence when installing or reassembling the cylinder head. In this article, we will discuss the recommended torque sequence for the 2.2 Ecotec engine’s head bolts.
Head Bolt Torque Sequence for the 2.2 Ecotec Engine
When tightening the head bolts on the 2.2 Ecotec engine, it is crucial to follow a specific sequence to ensure proper distribution of clamping force. This sequence helps prevent warping or damage to the cylinder head and ensures a reliable seal. Here is the recommended torque sequence for the 2.2 Ecotec engine’s head bolts:
Torque Sequence:
| Bolt Number | Torque Specification (ft. lbs.) | Torque Specification (Nm) |
|---|---|---|
| 1 | 15 | 20 |
| 2 | 30 | 40 |
| 3 | 30 | 40 |
| 4 | 30 | 40 |
| 5 | 30 | 40 |
| 6 | 30 | 40 |
| 7 | 30 | 40 |
| 8 | 30 | 40 |
Procedure:
To properly torque the head bolts on the 2.2 Ecotec engine, follow these steps:
1. Start by tightening all the bolts to 15 ft. lbs. (20 Nm) in the numerical order provided in the torque sequence table.
2. Next, repeat the process and torque all the bolts to 30 ft. lbs. (40 Nm) in the same numerical order.
3. Finally, go through the sequence one more time and tighten all the bolts an additional 90 degrees using a torque angle gauge.
By following this torque sequence and procedure, you can ensure that the head bolts are tightened evenly and securely, providing a proper seal for the cylinder head.
Conclusion
Properly torquing the head bolts on the 2.2 Ecotec engine is crucial for maintaining the integrity of the cylinder head and ensuring reliable engine performance. By following the recommended torque sequence and procedure outlined in this article, you can confidently assemble or reassemble the cylinder head, knowing that the head bolts are tightened correctly. Remember to always consult the specific service manual for your vehicle to ensure accurate torque specifications and procedures.