300CD (123.153) L5-3.0L DSL Turbo (617.952) (1982)
2. Screw pressure limiting valves (arrow) on pipe connections of injection pump.
The pressure limiting valves are required to protect the injection pump, e.g. when cranking with starter.
3. Switch on pump unit.
4. Swivel injection pump while watching fuel jet.
Begin of delivery is attained, when the fuel jet changes into a formation of droplets (arrow).
Nominal value: 24° + 1° before TDC.
Swivel direction of injection pump
Toward engine advances begin of delivery
Away from engine retards begin of delivery
Note: If possibilities for adjustment are insufficient, the injection pump must be changed over.
5. Check begin of delivery once again.
6. Shut off pump unit.
7. Assemble injection system.