NUMBER: 16–60–03Rev. S.M. REF.: 2.4 ENGINE: 60 DATE: January 2004 REVISION: Please discard Service Information Bulletin and service manual attachment pages dated December 2003. File this bulletin and insert attachment pages in its place in the service manual. SUBJECT: N3 ELECTRONIC UNIT INJECTOR-SERIES 60 2004 INTRODUCTION Detroit Diesel has released a new N3 Injector for the Series 60 2004 engine. DETAILS AND REASON Engine models built after December 1, 2003 will use the N3 Electronic Unit Injector (EUI). See Figure 1 and see Figure 2. The N3 injector is designed as an inline concept. The fuel metering unit or module is positioned under the plunger, so the overall envelope of the N3 is smaller than previous injectors. The N3 has an inwardly opening of solenoid valve which controls beginning of injection and end of injection. The solenoid valve closing point defines the beginning of injection (BOI) and the solenoid valve opening point defines the end of injection (EOI). Pressure is generated by the downward movement of the plunger in combination with the closed solenoid valve. Fuel quantity is metered by the length of time the solenoid valve remains closed. The magnetic core is incorporated into the module. The electrical leads from the core are brought to an external position on the injector through a modular two-pin connector socket. The advantages of the new N3 Injector over the current Series 60 EUI are: Improved strength. Reduced external leakage potential. Improved hydraulic efficiency. Faster response time. Compact design. Reduced weight. Improved nut design./Longer nozzle protrusion. Improved calibration system. Improved end of injection behavior. The amount of fuel injected and the beginning of injection timing is determined by the ECU. The ECU send a command pulse which activates the injector solenoid. The N3 EUI performs four functions: Creates the high-fuel pressure required for efficient injection.
NUMBER: 166003Rev. S.M. REF.: 2.4 ENGINE: 60 DATE: January
2004
REVISION: Please discard Service Information Bulletin and
service manual attachment pagesdated December 2003. File this
bulletin and insert attachment pages in its placein the service
manual.
SUBJECT: N3 ELECTRONIC UNIT INJECTOR-SERIES 60 2004
INTRODUCTIONDetroit Diesel has released a new N3 Injector for
the Series 60 2004 engine.DETAILS AND REASONEngine models built
after December 1, 2003 will use the N3 Electronic Unit Injector
(EUI). See Figure1 and see Figure 2. The N3 injector is designed as
an inline concept. The fuel metering unit or moduleis positioned
under the plunger, so the overall envelope of the N3 is smaller
than previous injectors. TheN3 has an inwardly opening of solenoid
valve which controls beginning of injection and end of
injection.The solenoid valve closing point defines the beginning of
injection (BOI) and the solenoid valve openingpoint defines the end
of injection (EOI). Pressure is generated by the downward movement
of the plungerin combination with the closed solenoid valve. Fuel
quantity is metered by the length of time the solenoidvalve remains
closed. The magnetic core is incorporated into the module. The
electrical leads from thecore are brought to an external position
on the injector through a modular two-pin connector socket.The
advantages of the new N3 Injector over the current Series 60 EUI
are:
The amount of fuel injected and the beginning of injection
timing is determined by the ECU. The ECUsend a command pulse which
activates the injector solenoid. The N3 EUI performs four
functions:
Creates the high-fuel pressure required for efficient
injection.
Meters and injects the exact amount of fuel to handle the
load.Atomizes the fuel for mixing with the air in the combustion
chamber.Permits continuous fuel flow for component cooling.
Figure 1 N3 Electronic Unit Injector Cross-Section
Figure 2 N3 Electronic Unit Injector
ADDITIONAL SERVICE INFORMATIONAdditional service information is
available in the Detroit Diesel Series 60 Service Manual,
6SE483.The next revision to this manual will include the revised
information. As a convenience to holders ofthe Series 60 Service
Manual, information in service manual format is attached. The
page(s) may beinserted into the manual.
NOTE:Manual insert pages are numbered for insertion into the
current Series 60 Service Manual datedMarch 2003. Service manuals
are available from authorized Detroit Diesel distributors. If this
bulletin
was obtained from the Internet, service manual page(s) are
available by returning to the screen SIBIndex, selecting attachment
pages, and printing the page(s).
Detroit Diesel, DDC, Series 60 and the spinning arrows design
are registered trademarks of Detroit Diesel Corporation. Copyright
2004 Detroit Diesel Corporation. All rights reserved. Printed in
U.S.A.
