If mating surfaces are not cleaned prior to installation, what effect does this have on the torque?

Cleaning mating surfaces prior to installation is crucial in ensuring that components fit together properly and function as intended. If the mating surfaces are not cleaned, debris, dirt, or old sealant can create irregularities that affect how well the surfaces mate. This can lead to a decrease in the effective area that is being clamped together, which may result in reducing the friction between the surfaces.

When there is reduced friction due to contaminants, the amount of torque required to achieve the desired clamping force is diminished. This is because torque is needed to overcome the frictional forces at play when tightening fasteners. If the friction is lessened, then less torque is required to achieve a secure fit. Thus, when this dirt or debris is not handled, it can lead to situations where the necessary torque to properly secure the assembly is lower than it should be.

Therefore, failing to clean the mating surfaces can fundamentally alter the dynamics of torque application, resulting in potential issues with how the components hold together.