Each engine has different torque specifications, especially when it comes to cylinder head bolts, which are usually tightened in specific sequences and to specific values (usually measured in Nm or ft-lb).
General Cylinder Head Bolt Torque Settings for Nissan Engines:
1. Nissan 4-Cylinder (e.g., SR20DE, KA24DE):
- Initial Torque: 29–34 ft-lb (39–46 Nm)
- Final Torque (Angle Tightening): Tighten an additional 90° (1/4 turn) after the initial torque.
2. Nissan V6 (e.g., VG30DE, VQ35DE):
- Initial Torque: 58–65 ft-lb (78–88 Nm)
- Final Torque (Angle Tightening): Tighten an additional 90° (1/4 turn) after the initial torque.
3. Nissan V8 (e.g., VK56DE):
- Initial Torque: 72–84 ft-lb (98–113 Nm)
- Final Torque (Angle Tightening): Tighten an additional 90° (1/4 turn) after the initial torque.
Key Points:
- Torque Sequence: Always follow the recommended tightening sequence. Most Nissan engines use a “criss-cross” or “spiral” pattern, starting from the center and working outward to ensure even pressure distribution.
- Multi-step Torquing: Some engines have a multi-step process, where you first torque the bolts to an intermediate setting, then tighten them in stages with an additional angle rotation (like 90°).
- Lubrication: It’s usually recommended to apply engine oil or assembly lube to the threads of the head bolts for accurate torque readings. Check the service manual for whether this applies to your specific engine.