Supply advance angle and injection timing are two different concepts, the two have different values, can not be confused.

　　Supply advance angle refers to the first cylinder piston injection pump began fueling the first cylinder diesel engine crankshaft location to the piston reaches top dead center of the crank angle, and injection timing refers to the first cylinder fuel injection It begins when injection to the cylinder, the first cylinder diesel engine crankshaft location crank shaft angle to the piston reaches top dead center.

　　After starting the plunger oil, diesel fuel under high pressure to shrink its volume, high pressure tubing to swell, but also there is a process and the time when the pressure wave propagation to the injector end. Therefore, the same diesel fuel supply advance angle is always greater than the fuel injection rake angle, about as big as 8 degrees.

　　Diesel fuel supply advance angle and injection timing are to be checked again on diesel, but with different inspection methods. Check supply advance angle is diesel in the flameout state, the hand crank, when the fuel pump cylinder starting first oil, oil was observed on the flywheel or pulley timing mark is aligned, in order to determine supply advance angle is correct.

　　Check diesel fuel injection advance angle is more complex, the need in working condition diesel engine, the use of special equipment for dynamic tests.

　　Therefore, the current supply of the diesel engine using the method most advance angle, manufacturers in product technical specifications provided in the "advance angle", are also refers to the diesel fuel supply advance angle, instead of injection timing, many technical specifications are confuse these two names of different concepts.