You must remove water in a bearing assembly prior to pouring Babbitt because?

Removing water from a bearing assembly before pouring Babbitt is crucial because if water is present during the pouring process, it can lead to blowback. This blowback occurs when the water vaporizes rapidly due to the heat of the molten Babbitt, creating steam that expands violently. The pressure buildup can cause the Babbitt to be expelled from the assembly, leading to dangerous situations and a poor-quality bond between the Babbitt and the bearing surfaces.

Ensuring the assembly is dry allows for a safe and effective pouring process, resulting in a strong and lasting bond that is essential for the integrity of the bearing operation. Keeping the assembly free from moisture is a fundamental step to achieve the desired performance of the bearing once it is in service.