Pic. 154. Fixing the injection pump regulator: 1 - injection pump; 2 - locking bolt; 3 - regulator with a ledge
The first method uses a pump, which helps to determine the exact moment of injection by pressure. For the second, a control device is used, which is screwed into the hole in the regulator housing, shown in fig. 154. Using a device with two control lamps, the injection start time is accurately determined by the marks on the crankshaft pulley.
Mercedes branded workshops use a special tester with a digital sensor.
Pic. 155. Adjusting screw for setting the injection moment
It should also be noted that the moment of setting the start of injection can be adjusted with the engine running. To do this, the injection pump flange is equipped with an adjusting screw, shown in fig. 155. When the screw is screwed in, a later injection moment is set, and when unscrewed, an earlier one.