About the 22R Engine
The 22R engine is a popular four-cylinder engine produced by Toyota. It was first introduced in 1981 and has since gained a reputation for its reliability and durability. The 22R engine is commonly found in Toyota trucks, including the Toyota Hilux and Toyota 4Runner. Known for its robustness, this engine has become a favorite among off-road enthusiasts and those seeking a reliable workhorse. One critical aspect of maintaining the 22R engine is ensuring the proper torque sequence for the head bolts. This article will guide you through the correct torque sequence for the 22R head bolts.
Head Bolt Torque Sequence for the 22R Engine
To properly torque the head bolts on a 22R engine, it is essential to follow a specific sequence. This sequence ensures that the head gasket is evenly compressed, preventing leaks and ensuring optimal engine performance. Below is the recommended torque sequence for the 22R head bolts:
| Bolt Number | Torque Specification (ft. lbs.) | Torque Specification (Nm) |
|---|---|---|
| 1 | 22 | 30 |
| 2 | 58 | 78 |
| 3 | 58 | 78 |
| 4 | 22 | 30 |
| 5 | 58 | 78 |
| 6 | 58 | 78 |
| 7 | 22 | 30 |
| 8 | 13 | 18 |
| 9 | 4 | 5 |
| 10 | 4 | 5 |
Torque Sequence Steps
To torque the head bolts of your 22R engine correctly, follow these steps:
1. Start by tightening bolt number 1 to the specified torque of 22 ft. lbs. (30 Nm).
2. Proceed to tighten bolts number 2 and 3 to the torque specification of 58 ft. lbs. (78 Nm).
3. Move on to bolt number 4 and tighten it to 22 ft. lbs. (30 Nm).
4. Continue by tightening bolts number 5 and 6 to the torque specification of 58 ft. lbs. (78 Nm).
5. Finally, tighten bolts number 7, 8, 9, and 10 to their respective torque specifications of 22 ft. lbs. (30 Nm), 13 ft. lbs. (18 Nm), 4 ft. lbs. (5 Nm), and 4 ft. lbs. (5 Nm).
Importance of Proper Torque Sequence
Following the correct torque sequence is crucial to ensure an even distribution of pressure on the head gasket. Failing to follow the proper sequence can result in uneven compression, leading to leaks, loss of power, and potential engine damage. By adhering to the recommended torque sequence, you can maintain the integrity of the head gasket and optimize the performance and longevity of your 22R engine.
In conclusion, the 22R engine is a reliable and durable powerplant found in Toyota trucks. When it comes to torquing the head bolts, it is essential to follow the correct sequence to ensure proper compression and prevent leaks. By following the steps outlined in this article and referring to the provided torque specifications, you can confidently torque the head bolts of your 22R engine and keep it running smoothly for years to come.