
There are several reasons why a diesel engine won't start: 1. Engine fuel system blockage: Check if the engine fuel system is unobstructed. If you hear a hissing sound from the fuel injector, it means the fuel system is functioning properly. 2. Cylinder compression: Inspect the cylinder compression. If the flywheel can still rotate after releasing the decompression device, there is an issue with cylinder compression, and the cylinder piston and piston rings need to be replaced. 3. Lubricating oil: Replace the lubricating oil in a timely manner. Overly viscous lubricating oil can also hinder smooth engine startup. 4. Fuel pump: Check if there is air in the fuel pump. If there is air in the fuel pump, the diesel engine won't start.


