What should be done if the crankpin bearing in the connecting rod is worn?

If the crankpin bearing in the connecting rod is worn, it should be replaced. This is because a worn crankpin bearing can lead to increased friction and play between moving parts, which can ultimately result in engine problems such as excessive wear on other components, overheating, or even catastrophic failure.

Replacing the worn bearing helps ensure that the connecting rod and crankshaft maintain proper alignment and function optimally. A new bearing provides the necessary support and lubrication to keep the engine running smoothly.

While lubricating the bearing may provide temporary relief, it does not address the underlying wear and damage. Similarly, repairs to a worn bearing are often not feasible or effective in restoring the integrity needed for reliable operation. Continuing to function with a worn bearing could lead to more significant issues down the road, making replacement the best course of action.