A: 1 The engine oil is insufficient. This fault can be eliminated by replenishing the lubricant as required;
2 The filter of the oil filter is clogged. It should be eliminated by cleaning the oil filter;
3 The oil pipe joint leaks or enters the air. In this case, the oil pipeline should be repaired to remove the air in the pipeline;
4 The oil pump pressure limiting valve spring is invalid or improperly adjusted. In the event of such a fault, the pressure limiting valve should be adjusted and the stalled spring replaced;
5 Link bearing or crankshaft main bearing clearance is too large. The gap between the connecting rod bearing and the main bearing should be checked and the bearing replaced if necessary to be removed.