Isuzu Trooper (1998-2002 year). Manual - part 577

6C – 4 ENGINE FUEL

HIGH PRESSURE OIL PUMP, OIL FLOW

P

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30

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5

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25

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Legend

(1)

Camshaft

(2)

Balance Shaft

(3)

Crankshaft

(4)

Oil Cooler and Oil Filter Assembly

(5)

Oil Filter Relief Valve 98 Kpa (1 kg/cm

2

/14.2 Psi)

(6)

Oil Cooler Relief Valve 245 Kpa (2.5 kg/cm

2

/

36 Psi)

(7)

First Oil Pump

(8)

Main Oil Relief Valve 588 Kpa (6 kg/cm

2

/ 85 Psi)

(9)

To Oil Pan

(10)

To Oil Pan

(11)

Injector

(12)

Oil Rail

(13)

Sub Oil Filter Relief Valve 98 Kpa (1 kg/cm

2

/

14.2 Psi)

(14)

Sub Oil Filter

(15)

Relief Valve 588 Kpa (6 kg/cm

2

/ 85 Psi)

(16)

Second Oil Pump

(17)

Oil Pan

(18)

To Oil Pan

(19)

Balance Shaft

(20)

Cooling Jet Relief Valve 245 Kpa (2.5 kg/cm

2

/

36 Psi)

(21)

Cooling Jet

(22)

To Oil Pan

(23)

Two Way Check Valve

(24)

Nipple Filter

(25)

Edge Filter

(26)

Edge Filter

(27)

High Pressure Oil Pump Assembly

(28)

To Oil Pan

(29)

Pressure Control Valve

(30)

To Oil Pan

(31)

Turbocharger

(32)

Oil Gallery

(33)

Timing Gear Train

040RW018

ENGINE FUEL 6C – 5

FUEL FILTER

Legend

(1) Priming Pump
(2) Fuel Filter Cartridge

A cartridge type fuel filter is used along with the piston
type fuel pump on the high pressure oil pump.
The fuel filter removes foreign material from the fuel
before it reaches the fuel pump.
A diaphragm type priming pump is installed at the top of
the fuel filter. It is used during the air bleeding
procedures.

INJECTOR ASSEMBLY

Legend

(1) Oil  Passage
(2) Fuel Passage

1. Construction of Fuel Injector

The fuel injector is comprised of the solenoid
section, hydraulic line, and fuel line. Fuel injection is
controlled by the continuity time signal and
continuity start timing signal sent by the ECM
(Electronic Control Module) to the solenoid.

2. Working of Fuel Injector

1) The ECM detects the working of the engine from

its input signals, such as engine speed
accelerator throttle opening, and engine coolant
temperature, sending the optimal signals to the
solenoid.

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2

041RW017

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2

055RW018

6C – 6 ENGINE FUEL

2) With the current carried to the solenoid, a

poppet valve is opened by means of an
armature to let high-pressure engine oil into the
injector.

3) Under the oil pressure, the piston and plunger

are depressed to compress the fuel. The
pressure of the compressed fuel is increased
over the pressure of high-pressure engine oil by
the ratio (about 7 : 1) of piston top to plunger
bottom.

4) The injection nozzle end needle is lifted under

the increased pressure of the fuel for fuel
injection.

5) With current stopped from the ECM, the poppet

valve is closed which holds up the high-pressure
engine oil and lets the oil used to compress fuel
out of the injector through its drain hole.

ENGINE FUEL 6C – 7

ON-VEHICLE SERVICE

FUEL FILTER ASSEMBLY

REMOVAL

1. Disconnect battery ground cable.
2. Fuel Filler cap
3. Fuel Hose

1) Disconnect fuel hose from filter body.

Plug the hose ends to prevent fuel spillage.

4. Remove the Bolt on Fuel Filter Bracket
5. Remove Fuel Filter Assembly

INSTALLATION

1. Install the fuel filter assembly
2. Tighten the Fuel Filter Bracket Fixing Bolt
3. Fuel Hose

1) Connect hoses to filter body.

4. Fuel Filler Cap

1) Connect the battery ground cable.
2) Feed fuel to the fuel pump by priming, and bleed

the air from fuel system.

FUEL FILTER CARTRIDGE

DISASSEMBLY

1. Drain fuel completely from the fuel filter.
2. Protect the filter body with cloth and lightly grip with

a vise.

3. Remove the cartridge using a filter wrench.

Filter wrench: 5-8840-0203-0 

1

Legend

(1)

Priming Pump

012RW111

012RW112