How to Adjust the Fuel Supply Angle of a Four-Cylinder Diesel Engine?

[BrookeLynn]

The steps to adjust the fuel supply angle of a four-cylinder diesel engine are as follows: 1. Remove the high-pressure fuel pipe of the first cylinder and connect a thin transparent small rubber tube to the outlet of the fuel injection pump. Place the throttle in the maximum position and rotate the crankshaft to eliminate air from the fuel line. Then, squeeze a few drops of oil from the small rubber tube, leaving a section at the end without oil to observe the fuel injection. 2. Slowly rotate the flywheel while observing the fuel injection in the rubber tube. When the oil level in the tube rises and just stops (i.e., the fuel supply from the injection pump has just ended), immediately stop rotating the flywheel. 3. Observe whether the piston has just reached the top dead center position at this time (the cylinder head can be removed in advance to facilitate observing the piston's upward position). If the fuel injection pump stops supplying fuel too early or continues supplying fuel for too long when the piston reaches top dead center, it indicates that the fuel supply advance angle is either too large or too small. Adjustments should be made to ensure they are basically consistent, which is considered good.