The steel backing of an insert bearing should be installed ____________.

The correct approach for installing the steel backing of an insert bearing is to do so dry. This means no lubrication or grease should be applied to the backing before installation. The reason for this is that the insert bearing and its backing must fit snugly into their designated locations in the engine, and excess lubrication could lead to improper placement or movement during engine operation.

By installing the bearing dry, it ensures that the backing adheres properly to the bearing surface, which is crucial for maintaining the integrity and performance of the engine. Additionally, once the engine is operational, the proper lubrication will occur through the engine's oil system, ensuring that the bearing operates under optimal conditions after installation.

While other choices may involve different methods of installation, they do not address the specific requirement of installing the steel backing dry, which is essential for achieving a proper fit and function within the engine.