Click here to make tpub.com your Home Page

Page Title: Injection Actuation System-continued
Back | Up | Next

Click here for thousands of PDF manuals

Google


Web
www.tpub.com

Home


   
Information Categories
.... Administration
Advancement
Aerographer
Automotive
Aviation
Construction
Diving
Draftsman
Engineering
Electronics
Food and Cooking
Logistics
Math
Medical
Music
Nuclear Fundamentals
Photography
Religion
   
   

 

21
TM 9-2320-312-24-2
Systems Operation Section
The high pressure oil passage connects with each
The injection actuation system serves two functions.
unit injector bore in order to supply high pressure
The injection actuation system supplies high
actuation oil to unit injectors (7). Actuation oil that
pressure oil in order to power HEUI injectors (7).
is under high pressure flows from unit injector
Also, the injection actuation system controls the
hydraulic pump (1) through the cylinder head to all
injection pressure that is produced by the unit
of the injectors. Oil is contained in the high pressure
injectors by changing the actuation pressure of the
oil passage until the oil is used by the unit injectors.
oil.
Oil that has been exhausted by the unit injectors is
expelled under the valve covers. This oil returns to
The injection actuation system consists of five basic
the crankcase through oil drain holes in the cylinder
components:
head.
Engine oil pump (4)
Engine oil filter (3)
Unit injector hydraulic pump (1)
Injection actuation pressure control valve (IAP
Control Valve) (10)
Injection actuation pressure sensor (IAP Sensor)
(6)
Oil from engine oil pump (4) supplies the needs
of the engine lubrication system. Also, oil from the
engine oil pump supplies the needs of unit injector
hydraulic pump (1) for the fuel system. The capacity
of the engine oil pump has been increased in order
to meet the additional flow requirement that is
necessary.
Oil that is drawn from the sump is pressurized
to the lubrication system oil pressure by engine
oil pump (4). Oil flows from the engine oil pump
through engine oil cooler (5), through engine oil
filter (3), and then to the main oil gallery. A separate
circuit from the main oil gallery directs a portion of
the lubrication oil in order to supply unit injector
hydraulic pump (1). A steel tube on the left side of
the engine connects the main oil gallery with the
inlet port of the unit injector hydraulic pump.
Oil flows into the inlet port of unit injector hydraulic
pump (1) and the oil fills the pump reservoir. The
pump reservoir provides oil to the unit injector
hydraulic pump during start-up. Also, the pump
reservoir provides oil to the unit injector hydraulic
pump until the engine oil pump can increase
pressure.
The pump reservoir also provides makeup oil to
the high pressure oil passage in the cylinder head.
When the engine is off and the engine cools down,
the oil shrinks. A check valve in the pump allows
oil to be drawn from the pump reservoir in order to
keep the high pressure oil passage full.
Oil from the pump reservoir is pressurized in unit
injector hydraulic pump (1) and the oil is pushed out
of the outlet port of the pump under high pressure.
Oil then flows from the outlet port of the unit injector
hydraulic pump to the high pressure oil passage in
the cylinder head.

Privacy Statement - Press Release - Copyright Information. - Contact Us

Integrated Publishing, Inc. - A (SDVOSB) Service Disabled Veteran Owned Small Business