Opening Pressure
- Remove fuel injection pipes from injector nozzles and pump. When removing fuel return pipe nut, hold nozzle holder body with a wrench to prevent it from rotating with nut.
- Remove injection nozzle assembly from cylinder head, using Nozzle Holder Socket Wrench (MD998387).
- Mount nozzle on nozzle tester and pump tester handle to bleed nozzle. See Fig 1 . Operate nozzle tester at a rate of more than 60 strokes per minute and read gauge pressure. The reading will increase gradually with pointer oscillating while nozzle is spraying. Injection pressure is the pressure at which the pointer starts to oscillate.
- Injection pressure should be 1707-1849 psi (120-130 kg/cm2 ). Service limit for the injectors is 1565 psi (110 kg/cm2 ). If test pressure is below limit, nozzle needs to be cleaned and adjusted.
- Injector pressure can be adjusted with shims that are available in varying thicknesses. A change of 0.004" (0.1 mm) will change injector pressure 142 psi (10 kg/cm2 ).