Which tool is used to install valve springs into a small engine?

The valve spring compressor is specifically designed for installing and removing valve springs in small engines. This tool allows for the safe and efficient compression of the valve springs, making it easier to access the retaining keepers that hold the springs in place. By compressing the spring, the valve spring compressor creates the necessary space to remove or install the keepers without risking damage to the components or injury.

Using the valve spring compressor is critical because it provides the mechanical advantage needed to manage the tension of the springs safely. This ensures that the springs are installed correctly and securely, which is vital for proper engine function. It also helps prevent injury to the technician, as the springs can be under significant tension.

In contrast, a compression gauge measures the compression level of the engine’s cylinders and is not involved in the installation of valve springs. A lapping stick is used for improving the seating surface of valves and seats but does not assist with valve spring installation. A flywheel holder is used to hold the flywheel in place during maintenance or adjustments but is unrelated to valve springs.