When some components of the engine show bearing wear in a short time, the cause can be a restriction in an oil passage.
An engine oil pressure indicator may show that there is enough oil pressure, but a component is worn due to a lack of lubrication. In such a case, look at the passage for the oil supply to the component. A restriction in an oil supply passage will not allow enough lubrication to reach a component. Early wear will result.
Refer to Specifications for more information regarding component wear limits.