engine ISUZU TROOPER 1998 Service Repair Manual

6A±33
ENGINE MECHANICAL
Camshaft
Removal
1. Disconnect battery ground cable.
2. Remove crankshaft pulley.

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

Refer to removal procedure for Timing Belt in this
manual.
4. Remove cylinder head cover LH.

Refer to removal procedure for Cylinder Head
Cover LH in this manual.
5. Remove cylinder head cover RH.

Refer to removal procedure for Cylinder Head
Cover RH in this manual.
6. Remove twenty fixing bolts from inlet and exhaust
camshaft bracket on one side bank, then camshaft
brackets.
014RW027
7. Remove camshaft assembly.
8. Remove fixing bolt for camshaft drive gear pulley.
9. Remove three fixing bolts from camshaft drive gear
retainer, then camshaft drive gear assembly.
014RW026
Legend
(1) Right Bank
(2) Left Bank
(3) Timing Mark on Retainer
Installation
1. Install camshaft drive gear assembly and tighten
three bolts to the specified torque.
Torque : 10 N´m (1.0 Kg´m/89 lb in)
2. Tighten bolt for camshaft drive gear assembly pulley
to the specified torque.
Torque : 98 N´m (10.0 Kg´m/72 lb ft)
3. Tighten sub gear setting bolt.
1. Use the 5±8840±2443±0 gear spring lever to turn
sub gear to right direction until it aligns with the M5
bolt hole between camshaft driven gear and sub
gear.
2. Tighten the M5 bolt to a suitable torque to prevent
the sub gear from moving.

6A±34
ENGINE MECHANICAL
014RW041
4. Install camshaft assembly and camshaft brackets,
tighten twenty bolts on one side bank to the specified
torque.
1. Apply engine oil to camshaft journal and bearing
surface of camshaft bracket.
2. Align timing mark on intake camshaft (one dot for
right bank, two dot for left bank) and exhaust
camshaft (one dot for right bank, two dots for left
bank) to timing mark on camshaft drive gear (one
dot).
014RW020
Legend
(1) Intake Camshaft Timing Gear for Right Bank
(2) Intake Camshaft Timing Gear for Left Bank
(3) Exhaust Camshaft Timing Gear
(4) Discrimination Mark
(LI: Left bank intake, RI: Right bank intake)
(LE: Left bank exhaust, RE: Right bank
exhaust)
014RW023
Legend
(1) Right Bank Camshaft Drive Gear
(2) Left Bank Camshaft Drive Gear
(3) Timing Mark on Drive Gear
(4) Dowel Pin

6A±35
ENGINE MECHANICAL
014RW024
Legend
(1) Right Bank
(2) Left Bank(3) Alignment Mark on Camshaft Drive Gear
(4) Alignment Mark on Camshaft
(5) Alignment Mark on Retainer
3. Tighten twenty bolts on numerical order an one
side bank as shown in the illustration.
Torque : 10 N´m (1.0 Kg´m/89 lb in)
014RW031
5. Install cylinder head cover RH.

Refer to installation procedure for CYLINDER
HEAD COVER RH in this manual.
6. Install cylinder head cover LH.

Refer to installation procedure for CYLINDER
HEAD COVER LH in this manual.
7. Install timing belt.

Refer to installation procedure for TIMING BELT in
this manual.8. Install crankshaft pulley.

Refer to installation procedure for CRANKSHAFT
PULLEY in this manual.
Accelerator pedal cable adjustment
1. Loosen adjusting nut and lock nut.
2. Pull outer cable while closing fully the throttle
valve.
3. Tighten adjusting nut and lock nut temporarily.

6A±36
ENGINE MECHANICAL
4. Loosen adjusting nut by three turns and tighten
lock nut.
Then, manually operating the throttle valve, make
sure that the valve lever returns up to the stopper
screw.
If it does not reach the stopper screw, repeat from
step 1.
035RW004
Legend
(1) Clearance
(2) Lock Nut
(3) Adjusting Nut

6A±37
ENGINE MECHANICAL
Cylinder Head
Removal
1. Remove engine hood.
2. Disconnect battery ground cable.
3. Drain radiator coolant.
4. Drain engine oil.
5. Remove crankshaft pulley.

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

Refer to removal procedure for Timing Belt in this
manual.
7. Remove cylinder head cover LH.

Refer to removal procedure for Cylinder Head
Cover LH in this manual.
8. Remove cylinder head cover RH.

Refer to removal procedure for Cylinder Head
Cover RH in this manual.
9. Remove common chamber.

Refer to removal procedure for Common Chamber
in this manual.
10. Remove cylinder head assembly.
1. Loosen eights bolts for tight cylinder head.
2. Remove cylinder head assembly.
014RW028
Legend
(1) Cylinder Head
(2) Cylinder Head Bolt
(3) Camshaft
Installation
1. Install cylinder head assembly to cylinder block.
1. Put cylinder head gasket on the cylinder block.NOTE: There is discrimination mark ªRº for right bank
and ªLº for left bank on the cylinder head gasket as shown
in the illustration.
Do not reuse cylinder head gasket.
011RW005
2. Align dowel pin hole to dowel pin on the cylinder
block.
3. Tighten two bolts temporarily by hand to prevent
the cylinder head assembly from moving.
4. Using 9±8511±4209±0 cylinder head bolt wrench,
tighten bolts in numerical order as shown in the
illustration to the specified torque.
NOTE: Do not reuse cylinder head bolts.
Do not apply any lubricant to the cylinder head bolts.
Torque :
Temporary : 29 N´m (3.0 Kg´m/21 lb ft)
Final : 64 N´m (6.5 Kg´m/47 lb ft)
014RW029

6A±38
ENGINE MECHANICAL
2. Install common chamber.

Refer to installation procedure for Common
Chamber in this manual.
3. Install cylinder head cover RH.

Refer to installation procedure for Cylinder Head
Cover RH in this manual.
4. Install cylinder head cover LH.

Refer to installation procedure for Cylinder Head
Cover LH in this manual.
5. Install timing belt.

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

Refer to installation procedure for Crankshaft
Pulley in this manual.
Accelerator pedal cable adjustment
1. Loosen adjusting nut and lock nut.
2. Pull outer cable while closing fully the throttle
valve.
3. Tighten adjusting nut and lock nut temporarily.
4. Loosen adjusting nut by three turns and tighten
lock nut.
Then, manually operating the throttle valve, make
sure that the valve lever returns up to the stopper
screw.
If it does not reach the stopper screw, repeat from
step 1.
035RW004
Legend
(1) Clearance
(2) Lock Nut
(3) Adjusting Nut

6A±39
ENGINE MECHANICAL
Valve Stem Oil Controller , Valve Spring and Valve Guide
Removal
1. Disconnect battery ground cable.
2. Drain engine oil.

Drain engine coolant.
3. Remove cylinder head assembly.

Refer to removal procedure for Cylinder Head in
this manual.
4. Remove camshaft.

Refer to removal procedure for Camshaft in this
manual.
5. Remove tappets with shim.
NOTE: Do not damage shim surface.
6. Remove valve springs using 5±8840±2446±0 valve
spring compressor and 5±8840±2547±0 valve spring
compressor adapter then remove upper valve spring
seat and lower seat.
014RW042
7. Remove oil controller using 5±8840±0623±0 oil
controller remover, remove each valve stem oil
controller.
8. Remove valve guide using 5±8840±2549±0 valve
guide replacer.
Installation
1. Install valve guide using 5±8840±2442±0 valve guide
installer.
2. Install oil controller using 5±8840±0624±0 oil
controller installer.
3. Install lower valve spring seat, valve spring and upper
valve spring seat then put split collars on the upper
spring seat, using 5±8840±2446±0 valve spring
compressor and 5±8840±2547±0 valve spring
compressor adapter to install the split collars.
014RW042
4. Install tappet with shim.
5. Install camshaft assembly.

Refer to installation procedure for Camshaft in this
manual.
6. Install cylinder head assembly.

Refer to installation procedure for Cylinder Head in
this manual.
7. Fill engine oil until full level.
8. Fill engine coolant.

6A±40
ENGINE MECHANICAL
Piston, Piston Ring and Connecting Rod
Removal
F06RW011
Legend
(1) Cylinder Head
(2) Crankcase with Oil Pan
(3) Oil Pipe(4) Oil Strainer
(5) Oil Gallery
(6) Piston with Connecting Rod Assembly
1. Remove cylinder head assembly.

Refer to removal procedure for Cylinder Head in
this manual.2. Remove crankcase with Oil Pan.

Refer to removal procedure for Oil Pan and
Crankcase in this manual.

6A±41
ENGINE MECHANICAL
3. Remove oil strainer fixing bolts, remove oil strainer
assembly with O-ring.
050RW002
Legend
(1) Oil Pump
(2) Oil Strainer
(3) Oil Gallery
(4) From Oil Filter
(5) To Oil Filter
4. Remove three fixing bolts, oil pipe with O-ring.
5. Remove eight fixing bolts, oil gallery.
6. Remove piston with connecting rod assembly, before
removing the bearing cap, remove carbon on the top
of cylinder bore and push piston with connecting rod
out from the top of cylinder bore.
Installation
1. Install piston with connecting rod assembly.

Apply engine oil to cylinder bore, connecting rod
bearing and crank pin.
When installing the piston, its front mark must face
the engine front side.

The bearing cap number must be the same as
connecting rod number.

Apply engine oil to the thread and seating surface of
each nut.

Tighten nuts to the specified torque.
Torque : 54 N´m (5.5 Kg´m/40 lb ft)

After tightening the nuts, make sure that the
crankshaft rotates smoothly.
NOTE: Do not apply engine oil to the bearing back faces
and connecting rod bearing fitting surfaces.
015RW003
Legend
(1) Piston Front Mark
(2) Piston Grade
(3) Connecting Rod Front Mark
2. Install oil gallery and tighten the bolts in two steps, in
the order shown in illustration.
Torque :
1st step : 29 N´m (3.0 Kg´m/21 lb ft)
2nd step : 55
±65

051RS009
3. Install oil pipe with O-ring.
Torque : 10 N´m (1.0 Kg´m/89 lb in)
4. Install oil strainer assembly with O-ring.
Torque : 25 N´m (2.5 Kg´m/18 lb ft)
5. Install crankcase with Oil Pan.

Refer to installation procedure for Oil Pan and
Crankcase in this manual.
6. Install cylinder head assembly.

Refer to installation procedure for Cylinder Head in
this manual.

6A±42
ENGINE MECHANICAL
Crankshaft and Main Bearings
Removal
F06RW010
Legend
(1) Engine Assembly
(2) Crankshaft Pulley
(3) Timing Belt Cover
(4) Timing Belt
(5) Crankcase with Oil Pan
(6) Oil Pipe
(7) Oil Strainer(8) Oil Pump Assembly
(9) Cylinder Body Side Bolt
(10) Oil Gallery
(11) Flywheel
(12) Rear Oil Seal Retainer
(13) Connecting Rod Cap
(14) Crankshaft Main Bearing Cap
(15) Crankshaft and Main Bearing
1. Remove engine assembly.

Refer to removal procedure for Engine Assembly in
this manual.
2. Remove timing belt.

Refer to removal procedure for Timing Belt in this
manual.3. Remove oil pan and crankcase.

Refer to removal procedure for Oil Pan and
Crankcase in this manual.
4. Remove oil pipe with O-ring.
5. Remove oil strainer assembly with O-ring.