What function does a ring compressor serve during engine assembly?

The function of a ring compressor during engine assembly is to compress piston rings to fit them into the cylinder walls. When assembling an engine, the piston rings must be securely compressed to allow the piston to be inserted smoothly into the cylinder without causing damage to either the rings or the cylinder walls.

Using a ring compressor ensures that the rings are held tightly together, reducing their diameter so that they can be easily inserted into the cylinder. Once the piston and compressor are pushed into the cylinder, the compressor is removed, allowing the rings to expand back to their operational size, creating a proper seal for optimal engine performance. This sealing effect is critical for maintaining compression and preventing oil from entering the combustion chamber.

Other options do not accurately describe the purpose of a ring compressor. Some suggest functions that are either unrelated to the assembly process or are more about measuring or removing components, which are not tasks performed by a ring compressor.