High Pressure Method

CHECKING INJECTION TIMING (BEGIN OF DELIVERY) (HIGH PRESSURE METHOD)

Test values
Injection timing (begin of delivery) before TDC in compression stroke +24° ± 1°

Attention! Push regulating lever of injection pump to full load while measuring and pull vacuum hose from vacuum control unit.

Tightening torque
Injection lines 25 Nm (18.5 ft lb)

Special Tools




Conventional tool
Torque wrench 1/2" square, 15-65 Nm


Checking

1. Clean injection lines in range of coupling nuts on injection pump as well as on fuel filter.




2. Set control rod of injection pump to full load. For this purpose, pull control lever (1) to full load stop (2).

For this purpose, pull vacuum hose from vacuum control unit and lock regulating lever of injection pump to full load.




3. Unscrew injection line for cylinder 1.

On injection pump, screw on test line with sight glass and install return line to fuel tank of pump unit.




4. Close fuel return line from injection pump to fuel filter.

Insert 0-ring into ring member (2) of return line and firmly push in quick lock.








5. Connect supply line (3) for injection pump with connecting line (4) of pump unit by means of a double hollow screw. Close connecting holes on fuel filter with closing plugs (arrows).

6. Clamp connecting cable of pump unit to vehicle battery (red terminal positive, black terminal negative).

7. Rotate crankshaft in direction of rotation of engine up to approx. 350 before TDC in compression stroke of first cylinder. Engage pump unit.

Attention! Engage pump unit only up to measuring. In the event of a leaking injection nozzle, fuel may enter combustion chamber.




8. Slowly rotate crankshaft in direction of rotation of engine, while watching fuel jet in sight glass.

Delivery begins when the fuel jet changes over into a formation of droplets.

In this position, read begin of delivery on graduated scale on balancing disk.

Nominal value: 24° ± 1°




9. Disconnect pump unit. Assemble injection system.

10. Ventilate injection system. Service and Repair Run engine and check all connections for leaks.