About the 4G63 Engine
The 4G63 engine is a popular four-cylinder, turbocharged engine manufactured by Mitsubishi Motors. It has gained a reputation for its reliability, power, and versatility, making it a favorite among car enthusiasts and tuners alike. The 4G63 engine has been used in various Mitsubishi models, including the iconic Lancer Evolution series, as well as other vehicles such as the Eclipse and Galant. Known for its strong performance and potential for modifications, the 4G63 engine has become a staple in the automotive industry.
4G63 Head Bolt Torque Specs
When working on the 4G63 engine, it is crucial to ensure that the head bolts are torqued to the correct specifications. This ensures proper sealing and prevents any potential issues that may arise from inadequate torque. Here are the recommended head bolt torque specifications for the 4G63 engine:
| Stage | Torque (ft. lbs.) | Torque (Nm) |
|---|---|---|
| Stage 1 | 22 | 30 |
| Stage 2 | 43 | 58 |
| Stage 3 | 65 | 88 |
Procedure for Torquing the Head Bolts
To ensure the proper torque of the head bolts, follow these steps:
1. Start by cleaning the threads of the head bolts and the bolt holes in the engine block using a suitable cleaning agent. This helps remove any dirt, debris, or old thread sealant that may interfere with the torque process.
2. Apply a thin layer of engine oil to the threads and washer surface of each head bolt. This lubricates the threads and ensures smooth tightening.
3. Begin torquing the head bolts in the specified sequence. It is crucial to follow the correct sequence to distribute the torque evenly across the cylinder head. Typically, the sequence starts from the center and works outward in a circular pattern.
4. For Stage 1, torque each head bolt to 22 ft. lbs. (30 Nm) using a torque wrench. Ensure that the torque is applied gradually and evenly.
5. Proceed to Stage 2 and torque each head bolt to 43 ft. lbs. (58 Nm) using the same sequence.
6. Finally, move on to Stage 3 and torque each head bolt to 65 ft. lbs. (88 Nm) following the specified sequence.
7. After completing the torque process, it is recommended to perform an additional 90-degree rotation on each head bolt in the same sequence. This ensures that the bolts are properly seated and provides an extra level of security.
By following these torque specifications and steps, you can ensure the proper installation of the cylinder head on your 4G63 engine. Remember to always refer to the manufacturer’s guidelines and consult a professional if you are unsure or inexperienced in performing such tasks.