About the 4G15 Engine
The 4G15 engine is a compact and efficient four-cylinder engine produced by Mitsubishi Motors. It is commonly found in small to mid-sized vehicles and is known for its reliability and fuel efficiency. The 4G15 engine has been used in various Mitsubishi models, as well as in other vehicles under different brand names. One important aspect of maintaining this engine is ensuring that the head bolts are torqued to the correct specifications. This article will provide the torque specifications for the 4G15 head bolts.
4G15 Head Bolt Torque Specifications
To ensure proper installation and sealing of the cylinder head, it is crucial to torque the head bolts to the correct specifications. The table below provides the recommended torque values for the 4G15 engine’s head bolts in both foot-pounds (ft. lbs.) and Newton meters (Nm):
| Head Bolt | 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 |
Steps to Torque the Head Bolts
To torque the head bolts of the 4G15 engine, follow these steps:
1. Start by cleaning the cylinder head and block surface to ensure a clean and smooth mating surface.
2. Apply a thin layer of engine oil to the threads and washer surfaces of the head bolts.
3. Install the cylinder head gasket onto the engine block, aligning it properly.
4. Carefully place the cylinder head onto the gasket, ensuring it is properly aligned with the block.
5. Begin tightening the head bolts in a crisscross pattern, starting with the center bolts and working your way outward.
6. Use a torque wrench to tighten each head bolt to the specified torque value in the table above. Gradually increase the torque in multiple stages to ensure even distribution.
7. Once all the head bolts have been torqued, recheck the torque on each bolt to ensure they are within the specified range.
8. Finally, follow the manufacturer’s recommended tightening sequence to achieve the desired torque specifications.
By following these steps and using the correct torque specifications, you can ensure that the head bolts of your 4G15 engine are properly tightened, providing a secure seal and optimal performance.
Remember, it is important to consult the specific vehicle’s service manual or contact a professional mechanic for any additional information or guidance regarding the torque specifications for the 4G15 engine’s head bolts.