What can be the consequence of excessive bearing clearance?

Excessive bearing clearance can lead to accelerated wear of engine components due to inadequate support for the moving parts. Bearings are designed to maintain a certain clearance to facilitate proper oil film formation, which lubricates and protects the surfaces in contact. When the clearance exceeds the specified limits, it can disrupt this oil film, causing metal-to-metal contact.

Over time, this leads to increased friction, generating heat and wear due to the lack of sufficient lubrication. As a result, components such as crankshafts and connecting rods can wear out more quickly, leading to potential engine failure. Thus, maintaining the correct bearing clearance is crucial for the longevity and reliable operation of an engine.