Device and method for adjusting fuel supply advance angle of multi-cylinder diesel engine

A device for adjusting a fuel supply advance angle of a multi-cylinder diesel engine, comprising a gear chamber, a connecting disc and a high-pressure fuel pump, the gear chamber and the connecting disc being assembled in the multi-cylinder diesel engine, the high-pressure fuel pump being arranged at a left end surface outside the gear chamber, and a main shaft end of the high-pressure fuel pump extending into the gear chamber and being fixedly connected to the connecting disc, wherein a right end surface of the connecting disc is fixedly connected to a timing gear of a fuel injection pump;

• a right end surface of the timing gear of the fuel injection pump is provided with three penetrating circular-arc waist-shaped holes that are away from the center and equally spaced along the circumference direction;
• annular sizing blocks are arranged on the waist-shaped holes;
• securing screws pass through the annular sizing blocks and the waist-shaped holes to fixedly connect the timing gear of the fuel injection pump to the right end surface of the connecting disc;
• a penetrating circular hole is arranged at a tail end of at least one waist-shaped hole of the circular-arc waist-shaped holes arranged on the right end surface of the timing gear of the fuel injection pump in a counterclockwise direction and away from the waist-shaped hole;
• the circular hole is provided with a T-shaped nut, and the axis of the T-shaped nut is in parallel with the end surface of the timing gear of the fuel injection pump;
• and a support screw is arranged in the T-shaped nut, and the screw head of the support screw is jacked against the annular sizing block.