About the 4AGE Engine
The 4AGE engine is a popular four-cylinder engine developed by Toyota. It was first introduced in 1983 and has since gained a reputation for its performance and reliability. The 4AGE engine is known for its high-revving nature and smooth power delivery, making it a favorite among car enthusiasts and motorsport enthusiasts alike. One critical aspect of maintaining the 4AGE engine is ensuring proper torque sequence for the head bolts. This article will provide a step-by-step guide on the head bolt torque sequence for the 4AGE engine.
Head Bolt Torque Sequence for the 4AGE Engine
To ensure the proper installation and sealing of the cylinder head, it is crucial to follow the correct torque sequence for the head bolts. The torque sequence ensures that the clamping force is evenly distributed across the cylinder head, preventing any leaks or damage. Here is the recommended head bolt torque sequence for the 4AGE engine:
| Bolt Number | Torque Specification (ft. lbs.) | Torque Specification (Nm) |
|---|---|---|
| 1 | 22-25 | 30-34 |
| 2 | 22-25 | 30-34 |
| 3 | 22-25 | 30-34 |
| 4 | 22-25 | 30-34 |
| 5 | 22-25 | 30-34 |
| 6 | 22-25 | 30-34 |
| 7 | 22-25 | 30-34 |
| 8 | 22-25 | 30-34 |
Step-by-Step Guide
Follow these steps to correctly torque the head bolts on your 4AGE engine:
1. Start by tightening all the head bolts to 14 ft. lbs. (19 Nm) in the numerical order specified in the torque sequence table.
2. Next, tighten all the head bolts to 36 ft. lbs. (49 Nm) in the same numerical order.
3. Finally, go through the entire sequence once more and tighten all the head bolts to the final torque specification of 50 ft. lbs. (68 Nm).
By following this torque sequence and the specified torque values, you can ensure that the cylinder head is properly secured and sealed, preventing any potential issues down the line.
Additional Tips
– It is essential to use a torque wrench calibrated to the specified torque values for accurate results.
– Always follow the recommended torque sequence to distribute the clamping force evenly.
– Make sure the cylinder head and the engine block surfaces are clean and free from any debris or old gasket material before installation.
– Replace the head bolts if they show signs of wear or damage.
Remember, proper torque sequence and values are crucial for the longevity and performance of your 4AGE engine. By following these guidelines, you can ensure a secure and leak-free cylinder head installation.