User Manual

HEUI Injector (Components)
The HEUI injector serves four functions. The HEUI injector pressurizes supply fuel from 450 kPa (65 psi) to
175 MPa (25382 psi). The HEUI injector functions as an atomizer by pumping high pressure fuel through
orifice holes in the unit injector tip. The HEUI injector delivers the correct amount of atomized fuel into the
combustion chamber and the HEUI injector disperses the atomized fuel evenly throughout the combustion
chamber.
Cross section of HEUI injector
(1) Solenoid
(2) Armature spring
(3) Armature
(4) Seated pin
(5) Spool spring
(6) Spool valve
(7) Check ball for intensifier piston
(8) Intensifier piston
(9) Return spring
(10) Plunger
(11) Barrel
(12) Nozzle case
(13) Inlet fill check
(14) Stop
(15) Nozzle spring
(16) Check piston
(17) Sleeve
(18) Reverse flow check valve
(19) Nozzle check
(20) Nozzle tip