Final answer:
The crown gear should be heated to a specified temperature before installation onto the flange case half to allow for thermal expansion and a snug fit upon cooling. Manufacturer specifications should be followed, and improper heating techniques should be avoided.
Step-by-step explanation:
Before attempting to install the crown gear onto the flange case half, it is common practice to heat the crown gear to a specified temperature. This process of heating expands the metal slightly, allowing it to fit over the flange more easily. Once the gear cools down, it contracts and fits snugly onto the flange. It's crucial to follow manufacturer specifications for the correct temperature and to avoid using methods that can unevenly heat or damage the gear, such as an oxy-acetylene torch.
It is typically not recommended to freeze the crown gear because this could cause brittleness in the metal, potentially leading to cracks or damage during installation. Also, while lubricating the mating surface with grease may be part of the installation process, it is the heating step that is critical for fitting the gear onto the flange.