What should be done to the valve springs and retainers during flywheel installation?

During flywheel installation, it is crucial to install the valve springs and retainers into their respective positions to ensure proper engine function. The valve springs provide the necessary force to keep the valves closed when they are not being actuated by the camshaft, while the retainers secure the springs in place. Proper installation is essential for maintaining the timing and operation of the engine valves, as any misalignment can lead to performance issues or engine damage.

While cleaning, replacing, or adjusting the components might be necessary in other maintenance scenarios, the immediate concern during flywheel installation is to ensure that all parts are correctly positioned and secured for optimal performance. Proper alignment during installation will help to maintain the integrity of the engine's operation once the flywheel is back in place.