First, the oil pump is not fed: The reason is that there is air in the fuel system, the oil line is blocked, there is no diesel oil in the fuel tank, the plunger of the oil pump is stuck, and the plunger or oil valve ring is seriously worn.
Second, the fuel supply advance angle is wrong.
Third, the fuel injector is not working properly: The reason is that the parts wear too much, the injector spring breaks, the injector needle stuck or the orifice is blocked.
Fourth, high pressure oil pipe leakage.
V. Wrong valve clearance and severe air filter plugging.
6. Insufficient compressive force: The reason is that the intake and exhaust valves leak, cylinder liners, pistons, and piston rings wear badly, and cylinder cushions are damaged.
VII. The starting system is faulty.
8. The temperature is too low and the oil viscosity is high.