Which statement about piston rings is true?

The correct statement regarding piston rings is that they are installed on the piston using a ring compressor. A ring compressor is a tool that compresses the rings together, allowing them to fit into the cylinder bore easily during installation. This compression is crucial because it prevents the rings from snagging on the cylinder walls as the piston is inserted.

Using a ring compressor also helps in ensuring that the rings seat properly against the cylinder walls once the piston is installed. This ensures optimal performance and prevents potential engine issues such as blow-by, which can occur if the rings are improperly installed.

While it is also important to check the end gap before installation and ensure that the rings are oriented correctly, the statement about using a ring compressor best captures a key aspect of the installation process. The staggering of ring end gaps is a valid consideration in ring installation, as it aids in engine efficiency and performance, but that detail is more about the configuration of the rings rather than the installation method itself. Therefore, the method of using a ring compressor is the most accurate and essential to the piston ring installation process.