Mechanical distributor injection pump having cold-start acceleration

A timing unit for a high-pressure pump for supplying an internal combustion engine with fuel, the timing unit displacing a point of injection and being accommodated on a housing of the high-pressure pump, comprising:

• a cold-start accelerator piston;
• an injection timing piston having inlet bores;
• a regulating slide movably accommodated in the injection timing piston, a face of the regulating slide facing the cold-start accelerator piston having an applied pre-stress force;
• and
• a first spring element, and a separate spring assembly accommodated on a carrier, positioned between the cold-start accelerator piston and the face of the injection timing piston;
• wherein the first spring element acts directly on a stop of the injection timing piston, and wherein the spring assembly acts on the regulating slide.