About the 2002 Nissan Altima 2.5 Engine
The 2002 Nissan Altima 2.5 is equipped with a reliable and efficient engine that powers this popular sedan. The engine is a 2.5-liter four-cylinder, which provides a balance between performance and fuel economy. With its compact design and advanced technology, this engine delivers a smooth and responsive driving experience. To ensure the proper functioning of the engine, it is crucial to adhere to the recommended torque specifications for the head bolts. In this article, we will provide you with the necessary information regarding the head bolt torque specs for the 2002 Nissan Altima 2.5.
Head Bolt Torque Specifications
To ensure the secure fastening of the cylinder head to the engine block, it is essential to tighten the head bolts to the specified torque. The following table provides the head bolt torque specifications for the 2002 Nissan Altima 2.5 engine:
| Head Bolt | Torque Specification (ft. lbs.) | Torque Specification (Nm) |
|---|---|---|
| 1-10 | 22-25 | 30-34 |
| 11-20 | 43-47 | 58-64 |
| 21-30 | 61-65 | 83-88 |
| 31-40 | 72-78 | 98-106 |
Procedure for Torquing Head Bolts
To properly torque the head bolts on the 2002 Nissan Altima 2.5 engine, follow these steps:
1. Start by ensuring that the engine is cold and the cylinder head and engine block surfaces are clean and free from any debris or oil.
2. Begin by tightening all the head bolts to 22-25 ft. lbs. (30-34 Nm) in the numerical order specified in the service manual.
3. Next, repeat the tightening process, increasing the torque to 43-47 ft. lbs. (58-64 Nm) for head bolts 11-20.
4. Continue the process, increasing the torque to 61-65 ft. lbs. (83-88 Nm) for head bolts 21-30.
5. Finally, tighten the remaining head bolts 31-40 to a torque of 72-78 ft. lbs. (98-106 Nm).
6. Once all the head bolts are torqued to the specified values, perform a final pass, tightening all the bolts an additional 80-85 degrees in the numerical order specified in the service manual.
7. Double-check all the head bolts to ensure they are properly torqued.
By following these torque specifications and the proper tightening procedure, you can ensure the secure fastening of the cylinder head to the engine block, promoting optimal engine performance and reliability.
Conclusion
The 2002 Nissan Altima 2.5 engine is a reliable powerplant that requires proper maintenance and torque specifications for its head bolts. By adhering to the recommended torque values and following the correct tightening procedure, you can ensure the longevity and performance of your engine. Always consult the service manual or seek professional assistance if you have any doubts or concerns. Proper torqueing of the head bolts is crucial for the overall health of the engine, so take the necessary precautions to ensure a job well done.