Loyale and Legacy HLA Noise

Should you encounter a Legacy or an Impreza with noisy hydraulic lash adjusters (HLA) which do not pressurize during normal running, the cause may be a partially blocked oil passage in the rocker shaft. Also, Loyale vehicles, especially those with higher mileage, may have an oil flow problem due to the oil pump. When checking oil pressure, it may be within specifications but the volume of oil may not be sufficient. In this case, it is recommended the oil pump be replaced.