ENGINE
L2501, WSM
[3] INJECTION NOZZLE Exhaust and noise regulations are becoming increasingly strict, particularly in regard to the reduction of NOx (nitrogen oxides) and particulates. The two-spring nozzle holder has been developed to reduce NOx (nitrogen oxides) and particulates from direct injection diesel engine exhaust. Features The two-spring nozzle holder limits needle valve lift at initial valve opening to throttle the injection quantity. Main injection occurs when the in-line pressure has increased sufficiently to move the needle valve through its full lift. The gives the following features. • Improved engine stability at low and intermediate speeds. • Decreased engine hunting and surge. • Decreased noise at idling. • Decreased idling speed because of improved engine stability. • Stabilized fuel injection characteristics from the injection pump and nozzle system, and easier matching of governor characteristics to engine demand. (1) Nozzle Holder Body (2) 1st Stage Injection Pressure Adjusting Shim (3) First Spring (4) Pressure Pin (5) Spring Seat (6) 2nd Stage Injection Pressure Adjusting Shim
(7) Second Spring (8) Pre-lift Adjusting Spring Seat (9) Chip-packing (10) Max-lift Adjusting Washer (11) Retaining Nut (12) Nozzle
9Y1211121ENM0009US0
1-M5
KiSC issued 09, 2014 A
