Engine Control System 1A-9 Injection Nozzle Legend 1. Edge filter A two-step valve opening pressure nozzle is used as the injection nozzle. Spray particle size is reduced by reducing the injection hole diameter. To prevent clogging of the nozzle injection hole, an edge filter is provided at the nozzle holder inlet. Fuel Filter with Sedimentor In order to secure the lubrication efficiency in the injection pump, a fuel filter with sedimentor to remove moisture in the fuel is provided. This filter is provided with a priming pump to bleed the air from the injection pump. Reference: If the injection nozzle hole is clogged, ECM corrects the cylinder inside condition.
The cylinder correction amount in the Tech 2 data list is helpful to know the injection nozzle condition. Legend 1. Priming pump 2. Fuel filter & sedimentor 1 LNW21ASF000301 1 2 LNW21ASH000601 Item Engine 4HK1 Valve opening pressure MPa(kg/cm2) 1st valve opening pressure 18.0 {185} (Nominal value) 2nd valve opening pressure 22.0 {225} (Nominal value) No. of injection holes - Injection hole diameter (mm) 5 -ø0.25