1998 ISUZU TROOPER check engine

6A Ð 48 ENGINE MECHANICAL
·Apply engine oil to the thrust washer.
·Assemble the thrust washer to the No. 3 bearing
journal. The oil grooves must face the crankshaft.
15. Main Bearing Cap Assembly
·Apply the recommended liquid gasket or its equiva-
lent to the No. 5 crankshaft bearing cap cylinder
body fiting surfaces at points 1 and 2 shown in the
illustration.
NOTE:
Be sure that the bearing cap fitting surface is completely
free of oil before applying the liquid gasket.
Do not allow the liquid gasket to obstruct the cylinder
thread holes and bearings.
·Install the bearing caps with the bearing cap head
arrow mark facing the front of the engine.
·Apply engine oil to the crankshaft bearing cap bolts.
·Tighten the crankshaft bearing cap bolts to the
specified torque a little at a time in the sequence
shown in the illustration.
NOTE:
Check to see that the crankshaft turns smoothly by rotating
it manually.
·Apply the recommended liquid packing or its equiva-
lent to the No. 5 crankshaft bearing cap 3 as shown
in the illustration.
Install the arch packing 4 to the No. 5 bearing cap.
NOTE:
Take care to install the arch packing in the groove of bearing
cap correctly.
Take care not to scratch the arch packing outer surface.
167 (17.0/123)N·m (kg·m/lb·ft)

6A Ð 50 ENGINE MECHANICAL
8. Camshaft Timing Gear
1) Install the camshaft timing gear to the camshaft.
The timing gear mark ("Y - Y") must be facing
outword.
2) Tighten the timing gear to the specified torque.
64 (6.5/47)N·m (kg·m/lb·ft)
7. Oil Pump Assembly
·Refer to ÔOil pumpÕ in Section 6A2.
6. Crankcase Assembly
·Refer to ÔCrankcaseÕ in Section 6A2.
5. Crankshaft Rear Oil Seal
1) Tighten the adapter to the crankshaft rear and
section with 2 bolts.
2) Insert the oil seal into the peripheral section of the
adapter,
3) Insert the sleeve into the adapter section, and 1)
tighten it with a bolt (M12 x 1.75L = 70) until the
adapter section hits the sleeve.
4) Remove the adapter and the sleeve.
5) With the seal pressed in, check the dimension of
the oil seal section.
Standard Dimension = 12.5 ± 0.3 mm
Oil Seal Installer: 5-8840-2359-0
4. Cylinder Block Rear Plate
·Tighten the cylinder block rear plate fixing bolt to the
specified torque
82 (8.4/61)N·m (kg·m/lb·ft)
3. Flywheel
·Refer to ÔCrankshaftÕ in Section 6A.
2. Cylinder Head Gasket
1. Carefully remove carbon deposits and gasket
residue from the piston top face and the cylinder
body upper surface.

6A2 Ð 2 4JG2-NA/4JG2-TURBO ENGINE
RECARD Comet V Type swirl combustion chamber which
provides superior driving performance, fuel economy and
silent combustion over a wide range of driving
conditions, is applied.
The cylinder head gasket is of laminated steel sheets.
Three grades of the gasket according to the measured
piston head projection from the cylinder block are
provided to give the engine a minimum compression
ration fluctuation.
The cylinder head fixing blots, flywheel bolts and con-
necting rod fixing bolts are tightened by the angular
Tightening Method.
The chrome plated steel dry type (Chromard) cylinder
liners provide the highest durability.
Auto-thermatic pistons having steel struts with 0.7 mm
offset from the piston pin center line, ate applied to
reduce thermal expansion and resulting engine noise
when the engine is cold.
The crankshaft bearings and connecting rod bearings are
of aluminum having a high bearing surface.
These bearing are especially sensitive to foreign material
such as metal scraps. So, it is very important that the oil
ports and other related surfaces are kept clean and free of
foreign material.
Crank shaft bearing selection for optimum bearing and
journal clearance is applied to reduce vibration and noise.
As tufftriding (Nitrizing treatment) is applied to increase
crankshaft strength, crankpins and journals should not be
reground.
An oiling jet device for piston cooling is provided in the
lubricating oil circuit from cylinder block oil gallery via a
check valve.
Take care not to damage any oiling jet when removing
and installing piston and connecting assembly.
The DFI (Double Formation Injection) Pintaux Type
injection nozzle having a sub-injection hole is applied.
This nozzle contributes to substantially minimize the
diesel knocking sound noticeable in the cold engine idling
operation.
Install the injection nozzle, directing the sub-injection hole
to the specified direction.
QOS III preheating system which features a quick-on glow
plug with thermometer control of the glowing time and
the afterglow time function, is applied.

6A2 Ð 16 4JG2-NA/4JG2-TURBO ENGINE
2) Measure the idler gear end play before removing the
idler gear.
NOTE:
Refer to the following items for details on the backlash
and end play measurement procedures.
Timing Gear Backlash Measurement
1) Set a dial indicator to the timing gear to measured.
Hold both the gear to be checked and the adjoining
gear stationary.
2) Move the gear to be checked as far as possible to
both the right and the left.
Take the dial indicator reading.
It the measured value exceeds the specified limit, the
timing gear must be replaced.
Idler Gear "A" End Play Measurement
Insert a feeler gauge between the idler gear and the thrust
collar to measure the gap and determine the idler gear
end play.
If the measued value exceeds the specified limit, the the
thrust collar must be replaced.
Standard
mm (in) Timing Gear Backlash
0.10-0.17 (0.0039-0.0067)Limit
0.30 (0.012)
11. Idle Gear
12. Injection Pump
1) Remove the six injection pump bracket bolts 1 from
the timing gear case.
Standard
mm (in) Idler Gear End Play
0.07 (0.0028)Limit
0.2 (0.0079)

6A2 Ð 32 4JG2-NA/4JG2-TURBO ENGINE
5. Vacuum Hose
6. Crankcase
·Remove crankcase fixing bolts two fixing bolts for
rear oil seal arch parts on crankcase could be
removed extention universal joint box wrench.
·Remove crankcase by using crankcase seal cutter
to shear sealant off and remove crankcase.
Oil seal cutter: 5-8840-2153-0
NOTE
·DonÕt ply crankcase or you may distort sealing
surface.
·Distorted or damaged crankcase should not by
used.
INSTALLATION
6. Crankcase
·Completely remove all sesidual sealant, lubricant
and moisture from the sealing surface of
crankcase and cylinder block.
·Apply a correct width bead of sealant (TB-1207C or
its equivalent) to contact surface of crankcase
there must be no gaps in the bead.
·Install crankcase with cylinder-block, and tighten
fixing bolts to the specified torque.
5. Vacuum Hose
4. Oil Level Gauge Guide Tube
·Install guide tube to the specified torque.
·Connect blow by hose to guide tube.
3. Oil Pipe Clip Bolts: Vacuum Pump
·Tighten oil pipe clip fixing bolts to the specified
torque.
2. Oil Return Pipe: Turbo.
·Tighten fixing nuts to crankcase to the specified
torque.
1. Transmission Housing Bolts
·Pour engine oil into engine.
·Install battery ground cable.
·Start the engine and check for oil leakage from
crankcase.
19 (1.9/14)N·m (kg·m/lb·ft)
19 (1.9/14)N·m (kg·m/lb·ft)
19 (1.9/14)N·m (kg·m/lb·ft)
8 (0.8/69)N·m (kg·m/lb·in)

4JG2-NA/4JG2-TURBO ENGINE 6A2 Ð 33
OIL FILTER CARTRIDGE
REMOVAL
·Place a receptacle beneath the oil filter to contain the
drained oil.
·Remove the oil filter cartridge using filter wrench.
Filter wrench: 5-8840-0200-0
INSTALLATION
·Lightly oil the o-ring of oil filter cartridge.
·Turn in the new oil filter cartridge by hand until the
sealing face is fiffted again the o-ring.
·Use the filter wrench to turn in the oil filter and
additional one and 1á1/8 turns.
·Start the engine and check for oil leakage from oil filter.

4JG2-NA/4JG2-TURBO ENGINE 6A2Ð 35
INSTALLATION
6. Oil Cooler
·Tighten oil cooler fixing bolt to the specified
torque and connect water hose.
5. Exh. Adapter (4JG2-T Only)
·Install exhaust duct with gasket and tighten fixing
bolts to the specified torque.
26 (2.7/20)N·m(Kg·m/lb·ft)
4. Heat Protector (4JG2-T Only)
3. Front Exh. Pipe
·Install front exhaust pipe and tighten fixing bolts
to the specified torque.
2. Intercooler Assembly (4JG2-T Only)
·Refer to intercooler installation steps in section.
·Pour coolant into radiator.
·Install battery ground cable.
·Start engine and check for oil and water leakage
carefully.
1. Air Cleaner Cover & Air Duct
67 (6.8/49)N·m(Kg·m/lb·ft)
Exh Dust Side
43 (4.4/32)N·m(Kg·m/lb·ft)
Intermediate pipe side 29 (3.0/22)N·m(Kg·m/lb·ft)

6A2 Ð 46 4JG2-NA/4JG2-TURBO ENGINE
REAR OIL SEAL
REMOVAL
1. Transmission Assembly
·Refer to ÒTransmissionÓ removal in section 7.
2. Flywheel
3. Rear Oil Seal
·With the oil seal pushed in deep, install the special
tool as shown in the illustration and remove the oil
seal.
Oil Seal Remover : 5-8840-2362-0
INSTALLATION
3. Rear Oil Seal
8. Crankshaft Rear Oil Seal
1) Tighten the adapter to the crankshaft rear and
section with 2 bolts.
2) Insert the oil seal into the peripheral section of the
adapter,
3) Insert the sleeve into the adapter section, and 1)
tighten it with a bolt (M12 x 1.75L = 70) until the
adapter section hits the sleeve.
4) Remove the adapter and the sleeve.
5) With the seal pressed in, check the dimension of
the oil seal section.
Standard Dimension = 12.5 ± 0.3 mm
Oil Seal Installer: 5-8840-2359-0