Stage Di Nozzle - Kubota WSM 07-E3B Series Workshop Manual

07-E3B SERIES, WSM

[2] 2 STAGE DI 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 (13)
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 (13)
through its full lift.
This 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
M-14
ENGINE
(7) Second Spring
(8) Pre-lift Adjusting Spring Seat
(9) Chip-packing
(10) Max-lift Adjusting Washer
(11) Retaining Nut
(12) Nozzle
(13) Needle Valve
W1014568
KiSC issued 06, 2020 A