1998 ISUZU TROOPER oil filter

6E±275 ENGINE DRIVEABILITY AND EMISSIONS
Poor Fuel Economy Symptom

StepActionValue(s)Ye sNo
1DEFINITION:
Fuel economy, as measured by an actual road test, is
noticeably lower than expected. Also, economy is
noticeably lower than it was on this vehicle at one time,
as previously shown by an actual road test.
(Non-standard tires will cause odometer readings to be
incorrect, and that may cause fuel economy to appear
poor when it is actually normal.)
Was the ªOn-Board Diagnostic (OBD) System Checkº
performed?
ÐGo to Step 2
Go to OBD
System
Check
21. Perform a bulletin search.
2. If a bulletin that addresses the symptom is found,
correct the condition as instructed in the bulletin.
Was a bulletin found that addresses the symptom?
ÐVerify repairGo to Step 3
3Was a visual/physical check performed?
ÐGo to Step 4
Go to
Visual/Physic
al Check
4Check owner's driving habits.

Is the A/C ªONº full time (defroster mode ªONº)?

Are tires at the correct pressure?

Are excessively heavy loads being carried?

Is acceleration too much, too often?
Was a problem found?
ÐGo to Step 5Go to Step 6
5Review the items in Step 4 with the customer and
advise as necessary.
Is the action complete?
ÐSystem OKÐ
61. Visually/physically check: Vacuum hoses for splits,
kinks, and improper connections and routing as
shown on the ªVehicle Emission Control
Informationº label.
2. If a problem is found, repair as necessary.
Was a problem found?
ÐVerify repairGo to Step 7
71. Remove and check the air filter element for dirt or for
restrictions. Refer to
Air Intake System.
2. Replace the air filter element if necessary.
Was a repair required?
ÐVerify repairGo to Step 8
81. Remove spark plugs and check for wet plugs,
cracks, wear, improper gap, burned electrodes, or
heavy deposits. Refer to
Spark Plug Replacement.
NOTE: If spark plugs are gas or oil fouled, the cause of
the fouling must be determined before replacing the
spark plugs.
2. If a problem is found, repair as necessary.
Was a problem found?
ÐVerify repairGo to Step 9
91. Check for low engine coolant level. Refer to Engine
Cooling
.
2. If a problem is found, repair as necessary.
Was a problem found?
ÐVerify repairGo to Step 10

6E±283 ENGINE DRIVEABILITY AND EMISSIONS
Cuts Out, Misses Symptom

 
StepNo Ye s Value(s) Action
101. Visually/physically inspect for the following
conditions:

Restricted air intake system. Check for a
possible collapsed air intake duct, restricted
air filter element, or foreign objects blocking
the air intake system.

Throttle body. Check for objects blocking the
IAC passage or throttle bore, excessive
deposits in the IAC passage and on the IAC
pintle, and excessive deposits in the throttle
bore and on the throttle plate.

Large vacuum leak. Check for a condition that
causes a large vacuum leak, such as an
incorrectly installed or faulty PCV valve or
brake booster hose disconnected .
2. If a problem is found, repair as necessary.
Was a problem found?
ÐVerify repairGo to Step 8
11Check the injector connections. If any of the injectors
are connected to an incorrect cylinder, correct as
necessary.
Was a problem found?
ÐVerify repairGo to Step 12
121. Perform the ªInjector Coil/Balance Testº in Fuel
Metering System
.
2. If a problem is found, repair as necessary.
Was a problem found?
ÐVerify repairGo to Step 13
131. Check for fuel in the pressure regulator vacuum
hose.
2. If fuel is present, replace the fuel pressure regulator
assembly. Refer to
Fuel Metering System.
3. If a problem is found, repair as necessary.
Was a problem found?
ÐVerify repairGo to Step 14
141. Check for proper ignition voltage output with spark
tester J 26792 (ST-125). Refer to
Electronic Ignition
System
for the procedure.
2. If a problem is found, repair as necessary.
Was a problem found?
ÐVerify repairGo to Step 15
151. Remove spark plugs. Check for wet plugs, cracks,
wear, improper gap, burned electrodes, or heavy
deposits. Refer to
Electronic Ignition System.
NOTE: If spark plugs are gas or oil fouled, the cause of
the fouling must be determined before replacing the
spark plugs.
2. If a problem is found, repair as necessary.
Was a problem found?
ÐVerify repairGo to Step 16
161. Check for a loose ignition coil ground.
Refer to
Electronic Ignition System.
2. If a problem is found, repair as necessary.
Was a problem found?
ÐVerify repairGo to Step 17

6E±303 ENGINE DRIVEABILITY AND EMISSIONS
4. Check the transfer case oil level. Add fluid if
necessary.
5. Connect the negative battery cable.
Air Cleaner/Air Filter
Removal Procedure
1. Loosen the clamp between the air cleaner lid and the
mass air flow sensor.
2. Release the four latches securing the lid to the air
cleaner housing.
3. Remove the air cleaner lid.
TS23973
4. Remove the air filter element.
TS23794
5. Remove the retaining bolts and the air cleaner
housing from the vehicle.
130RT002
Installation Procedure
1. Install the air cleaner housing in the vehicle with the
retaining bolts.
130RT002

6E±314
ENGINE DRIVEABILITY AND EMISSIONS
3. Connect the wiring connector to the fuel gauge unit.
TS23771
4. Fill the fuel tank with fuel.

Tighten the fuel filler cap.

Check for leaks at the fuel gauge unit gasket.
5. Connect the negative battery cable.
Fuel Injectors
Removal Procedure
NOTE: If the fuel injectors are leaking, the engine oil may
be contaminated with fuel. Check the oil for signs of
contamination and change the oil and the filter if
necessary.
NOTE: Use care in removing the fuel injectors in order to
prevent damage to the fuel injector electrical connector
pins or the fuel injector nozzles. The fuel injector is an
electrical component and should not be immersed in any
type of cleaner as this may damage the fuel injector.
IMPORTANT:Fuel injectors are serviced as a complete
assembly only.
1. Disconnect the negative battery cable.
2. Remove the upper intake manifold. Refer to
Common Chamber in Engine Mechanical..
3. Remove the fuel rail. Refer to
Fuel Rail.
014RW164
4. Remove the injector retainer clip.
055RW009
5. Remove the fuel injector assembly.
6. Remove the O-ring from the fuel injector.
7. Remove the O-ring backup from the fuel injector .
Inspection Procedure
1. Inspect the O-rings for cracks or leaks.
2. Replace worn or damaged O-rings.
3. Lubricate the new O-rings with engine oil before
installation.

6G±1 ENGINE LUBRICATION
ENGINE
ENGINE LUBRICATION
CONTENTS
Service Precaution 6G±1. . . . . . . . . . . . . . . . . . . . . .
General Description 6G±2. . . . . . . . . . . . . . . . . . . . .
Oil Pump 6G±3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Oil Pump and Associated Parts 6G±3. . . . . . . . . .
Oil Pump and Associated Parts 6G±3. . . . . . . . . .
Inspection and Repair 6G±4. . . . . . . . . . . . . . . . . .
Reassembly 6G±5. . . . . . . . . . . . . . . . . . . . . . . . . .
Oil Pan and Crankcase 6G±7. . . . . . . . . . . . . . . . . .
Removal 6G±7. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 6G±7. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Oil Pump 6G±10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Removal 6G±10. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 6G±10. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Oil Pump Oil Seal 6G±12. . . . . . . . . . . . . . . . . . . . . . .
Removal 6G±12. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 6G±12. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Oil Filter 6G±13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removal 6G±13. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 6G±13. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Main Data and Specification 6G±14. . . . . . . . . . . . . .
Special Tool 6G±15. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service Precaution
WARNING: I F S O E Q U IPPED WITH A
SUPPLEMENTAL RESTRAINT SYSTEM (SRS),
REFER TO THE SRS COMPONENT AND WIRING
LOCATION VIEW IN ORDER TO DETERMINE
WHETHER YOU ARE PERFORMING SERVICE ON OR
NEAR THE SRS COMPONENTS OR THE SRS
WIRING. WHEN YOU ARE PERFORMING SERVICE
ON OR NEAR THE SRS COMPONENTS OR THE SRS
WIRING, REFER TO THE SRS SERVICE
INFORMATION. FAILURE TO FOLLOW WARNINGS
COULD RESULT IN POSSIBLE AIR BAG
DEPLOYMENT, PERSONAL INJURY, OR
OTHERWISE UNNEEDED SRS SYSTEM REPAIRS.
CAUTION: Always use the correct fastener in the
proper location. When you replace a fastener, use
ONLY the exact part number for that application.
ISUZU will call out those fasteners that require a
replacement after removal. ISUZU will also call out
the fasteners that require thread lockers or thread
sealant. UNLESS OTHERWISE SPECIFIED, do not
use supplemental coatings (Paints, greases, or other
corrosion inhibitors) on threaded fasteners or
fastener joint interfaces. Generally, such coatings
adversely affect the fastener torque and the joint
clamping force, and may damage the fastener. When
you install fasteners, use the correct tightening
sequence and specifications. Following these
instructions can help you avoid damage to parts and
systems.

6G±2
ENGINE LUBRICATION
General Description
C06RW002
Legend
(1) Oil Strainer
(2) Oil Pump
(3) Relief Valve
(4) Oil Pressure Switch
(5) Oil Filter
(6) Safety Valve
(7) Oil Pressure Unit
(8) Oil Gallery
(9) Crankshaft Bearing(10) Crankshaft
(11) Connecting Rod Bearing
(12) Connecting Rod
(13) Piston
(14) Oil Gallery; Cylinder Head
(15) Camshaft
(16) Camshaft Journal
(17) Front Journal; Camshaft Drive Gear
(18) Rear Journal; Camshaft Drive Gear
(19) Oil Pan

6G±10
ENGINE LUBRICATION
Oil Pump
Removal
1. Disconnect battery ground cable.
2. Drain engine oil.
3. Remove crankcase assembly.

Refer to removal procedure for Oil Pan and
Crankcase in this manual.
4. Remove crankshaft pulley.

Refer to removal procedure for Crankshaft Pulley in
this manual.
5. Remove timing belt.

Refer to removal procedure for Timing Belt in this
manual.
6. Remove timing pulley from crankshaft.
7. Remove four fixing bolts from oil filter assembly.
8. Remove oil strainer fixing bolts, remove oil strainer
assembly with O-ring.
9. Remove three bolts from oil pipe and O-ring.
10. Remove eight oil pump fixing bolts, then oil pump
assembly.
11. Remove sealant from mounting surface of oil pump
assembly, cylinder block and take care not to damage
mounting surfaces of oil pump and cylinder block.
Installation
1. Install oil pump assembly

Apply sealant (TB-1207B or equivalent) to the oil
pump mounting surfaces as shown in the
illustration.

The oil pump assembly must be installed within 5
minutes after sealant application before the sealant
hardens.
NOTE: Do not apply sealant to the oil ports.
051RW002

Use 5±8840±2287±0 installer when installing new
oil seal.

Apply engine oil to oil seal lip.

Install oil pump assembly to the cylinder block.
NOTE: Do not damage oil seal during installation of oil
pump assembly.
015RS001

Tighten fixing bolts to the specified torque.
Torque : 25 N´m (2.5 Kg´m/18 lb ft)
051RW001
2. Install oil pipe with O-ring, tighten fixing bolt to the
specified torque.
Torque : 10 N´m (1.0 Kg´m/89 lb in)
3. Install oil strainer with O-ring, tighten fixing bolt to the
specified torque.
Torque : 25 N´m (2.5 Kg´m/18 lb ft)

6G±11 ENGINE LUBRICATION
4. Install oil filter assembly and tighten bolts to the
specified torque.
Torque : 25 N´m (2.5 Kg´m/18 lb ft)
050RW001
Legend
(1) Oil Pump
(2) Oil Filter
(3) Oil Gallery
(4) From Oil Filter
(5) To Oil Filter
5. Install timing pulley on crankshaft.
Install timing belt.

Refer to installation procedure for Timing Belt in this
manual.
6. Install crankshaft pulley.

Refer to install procedure for Crankshaft Pulley in
this manual.
7. Install crankcase assembly.

Refer to installation procedure for Oil Pan and
Crankcase in this manual.
8. Refill engine oil until full level on engine oil dipstick.