About the 22RE Engine
The 22RE engine is a popular four-cylinder engine produced by Toyota. It was introduced in the early 1980s and has been used in various Toyota models, including the Toyota Pickup and 4Runner. Known for its reliability and durability, the 22RE engine has become a favorite among off-road enthusiasts and everyday drivers alike. One crucial aspect of maintaining this engine is ensuring proper torque sequence when tightening the head bolts. In this article, we will discuss the head bolt torque sequence for the 22RE engine and provide the necessary specifications.
Head Bolt Torque Sequence
When tightening the head bolts on the 22RE engine, it is essential to follow a specific sequence to ensure proper distribution of torque. This sequence helps prevent warping or damage to the cylinder head and ensures a secure and leak-free seal. The head bolt torque sequence for the 22RE engine is as follows:
| 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 | 6 |
| 10 | 13 | 18 |
Step-by-Step Procedure
To properly torque the head bolts on the 22RE engine, follow these steps:
1. Start by cleaning the cylinder head and block surfaces thoroughly to ensure a clean and smooth mating surface.
2. Apply a thin layer of engine oil to the threads and washer face of each head bolt.
3. Begin tightening the head bolts in the specified sequence outlined in the table above.
4. Use a torque wrench to tighten each bolt to the specified torque value in foot-pounds (ft. lbs.).
5. After completing the first round of torque, repeat the sequence for a second round.
6. Finally, perform a third round of torque, but this time, tighten each bolt an additional 90 degrees (1/4 turn) using a torque angle gauge.
By following this torque sequence and procedure, you can ensure that the head bolts are properly tightened and the cylinder head is securely fastened to the engine block.
Importance of Proper Torque Sequence
Proper torque sequence is crucial when tightening the head bolts on the 22RE engine. Failing to follow the correct sequence can lead to uneven distribution of torque, which may result in cylinder head warping, leaks, or even engine damage. It is essential to adhere to the specified torque values and sequence to maintain the integrity and performance of the engine.
In conclusion, the 22RE engine is a reliable and durable powerplant used in various Toyota models. When it comes to tightening the head bolts, following the correct torque sequence and specifications is vital. By adhering to the recommended procedure, you can ensure a secure and leak-free seal, allowing your 22RE engine to perform at its best.