_Preparation:_
- Make sure the engine is cold and has not been running for at least 30 minutes.
- Gather your tools, which include:
1) A set of feeler gauges with metric measurements from 0.002 to 0.030 inches.
2) A 1/4-inch ratchet with a 10-mm socket.
3) A flathead screwdriver.
4) A small brush for cleaning.
_Procedure:_
1. Locate the valve cover on the engine. On the RF8 engine, it's on top of the engine and held by bolts or nuts.
2. Remove the bolts or nuts holding the valve cover and gently lift the valve cover to expose the valve train.
3. Find the valve you want to adjust. On the RF8 engine, the valve train is symmetrical with four valves per cylinder, two intake valves (closer to the front), and two exhaust valves (closer to the rear).
4. Clean the valve stem and the rocker arm surface where the valve lash will be adjusted. Remove any dirt, oil, or carbon deposits.
5. Slide a feeler gauge between the valve stem and the rocker arm. The feeler gauge should slide in with slight drag but without excessive force.
6. Adjust the valve lash by turning the adjustment nut near the valve stem. Turning the nut clockwise increases the lash, while turning it counterclockwise decreases the lash.
7. Recheck the valve lash with the feeler gauge to ensure that it's within the specified range for the RF8 engine, which is typically between 0.008 and 0.012 inches for both the intake and exhaust valves.
8. Repeat steps 4-7 for all the valves on the engine, ensuring that each valve has the correct valve lash.
9. Once all the adjustments are made, reinstall the valve cover, making sure to replace any gaskets or seals as necessary. Tighten the bolts or nuts to the specified torque.
Adjusting valve lash is a crucial task that ensures proper valve operation, sealing, and engine efficiency. Before performing this adjustment, it's recommended to refer to the Nissan RF8 engine's specific service manual for detailed instructions and any additional specifications that apply.
