oil ISUZU TROOPER 1995 Workshop Manual

6A-40 GENERAL ENGINE MECHANICAL
Fig. 6A-116
9. Piston and connecting rod assembly.
Cl • Apply engine oil to the cylinder bores, the
L:J connecting rod bearings and the crankshaft
pins.
NOTE:
Do not apply engine oil to the bearing back
faces and the connecting rod bearing fitting
surfaces.
• Check to see that the piston ring end gaps are
correctly positioned (Fig. 6A-117).
Oil ring--~~~=!==:::;:,.::~~--No.1 side rail Compression (Lower) ring
Front mark
No. 2--~~~~i::::::=~~;(.,.--Oil ring Compression side rail ring (Upper)
Fig. 6A-117
• Insert the piston/connecting rod assemblies
into each cylinder with the piston ring com­
pressor.
• The front marks must be facing the front of the
engine (Fig. 6A-118).
8.
Front mark
Front mark
Fig. 6A-118
Oil gallery
• Tighten the bolts in 2 steps in the order shown
(Fig. 6A-119).
1~1 _________ 1s_t,s_te~p ________ +-_2_n_d_S_t_e_p ___
7.
N·m (lb·ftl 29 (22) ss· -ss·
Crankcase side bolts (Fig. &A-119)
• Tighten crankcase bolts in sequence shown in
the
illustration.
I~I __ T_o_r~qu_e __ N_·_m __ (lb_·ft_)~ ______ 3_9_(2_9_l ____ _
Q : Oil gallery fixing bolts 0 : Crankcase bolts
Fig. 6A-119
6. Oil pump assembly
• Refer to Section 6A 1 "Oil pump installation".
5. Oil strainer and rubber ring
4.
Oil pipe and rubber ring
•

3. Oil pan
m 1) Completely remove all residual sealant,
t..al lubricant and moisture from the sealing
surfaces. The surfaces must be perfectly dry.
li5il 2) Apply a correct width bead of sealant (TB­
L::!i!J 1207C or its equivalent) to the contact surfaces
of the oil pan. There must be no gaps in the
bead (Fig. 6A-120).
3) The oil pan must be installed within 5 minutes
after sealant application.
4) Tighten the bolts and nuts to the specified
torque.
1«.1 Torque N·m (lb-in) 10 (87)
4.3mm (0.17in.) width bead of sealant
Fig. 6A-120
2. Cylinder head gasket
1. Cylinder head assembly
• Refer to Section 6A 1 "Cylinder head
installation".
GENERAL ENGINE MECHANICAL 6A-41

ENGINE (V6 3.2L DOHC AND SOHC) 6A 1-1
SECTION 6A1
3.2L V6 ENGINE
CONTENTS
General Description .................. 6A1-2 Crankshaft Pulley ................... 6A1-24
Cylinder Block . . . . . . . . . . . . . . . . . . . . . 6A 1-3 Camshaft/Rocker Arm (SOHC) ........ 6A1-25
Cylinder Head ...................... 6A1-3 Camshaft/Swing Arm/Hydraulic Lash
Valve Train ........................ 6A1-3 Adjusters (DOHC) ................. 6A1-29
Intake Manifold .................... 6A1-3 Timing Chain (DOHC) ................ 6A1-33
Exhaust Manifold ................... 6A1-3 Valve stem Oil Controller and
Piston and
Connecting Rod .......... 6A1-3 Valve Spring ..................... 6A1-38
Crankshaft and Bearing .............. 6A1-3 Cylinder Head (SOHC) ............... 6A1-42
Oil Pump .......................... 6A1-3 Cylinder Head (DOHC) ............... 6A1-46
Engine Lubrication . . . . . . . . . . . . . . . . . . 6A 1-3 Oil Pan ............................ 6A 1-50
On-Vehicle Service . . . . . . . . . . . . . . . . . . 6A1-4 Oil Pump .......................... 6A 1-52
Cylinder Head Cover LH (SOHC) ....... 6A1-4 Oil Pump Oil seal ................... 6A 1-53
Cylinder Head Cover RH (SOHC) ...... 6A1-5 Oil Filter ........................... 6A 1-54
Cylinder Head Cover (DOHC) . . . . . . . . . 6A 1-6 Oil Cooler .......................... 6A 1-55
Common Chamber Duct (DOHC) ...... 6A1-8 Piston, Piston Rings and Connecting Rod . 6A 1-56
Common Chamber (SOHC) ........... 6A1-10 Crankshaft and Main Bearings ........ 6A1-57
Common Chamber (DOHC) ........... 6A1-12 Rear Oil Seal ....................... 6A1-60
Intake Manifold (SOHC) .............. 6A1-14 Engine Assembly .................... 6A1-61
Intake Manifold (DOHC) ............. 6A1-16 Main Data and Specification ........... 6A1-63
LH Exhaust Manifold . . . . . . . . . . . . . . . . 6A 1-18 General Specification ................ 6A 1-63
RH Exhaust Manifold ................ 6A1-19 Torque Specification ................ 6A1-64
Timing Belt ........................ 6A1-20 Special Tools ........................ 6A1-69

CYLINDER BLOCK
The cylinder block is made of aluminum die-cast
casting
for 75° V-type six cylinders. It has a rear plate
integrated structure and employs a deep skirt. The
cylinder liner is cast and the liner inner diameter and
crankshaft
journal diameter are classified into grades.
The crankshaft is supported by four bearings
of which
width is different between No.2, No.3 and No.1, No.4;
the
width of No.3 bearing on the body side is different
in order
to support the thrust bearing. The bearing cap
is made
of nodular cast iron and each bearing cap uses
four bolts and two side bolts.
CYLINDER HEAD
The cylinder head, made of aluminum alloy casting
employs a pent-roof type combustion chamber with a
spark
plug in the center.
The intake and exhaust
valves are placed in V-type
design. The ports are cross-flow type.
VALVE TRAIN
SOHC: The camshafts on both banks are driven by a
timing
belt to operate the valves via rocker arm.
No
further valve clearance adjustment is
required, due
to the Hydraulic lash adjuster
attachedtotherockerarm.
DOHC: Intake camshaft on the both sides of banks are
driven through a
timing belt, while exhaust
camshaft are driven by the both sides
of intake
camshaft through chains.
The driven camshafts open and
close valves
through swing arms.
Valve clearance is automatically adjusted by
means
of HLA built in the cylinder head.
INTAKE MANIFOLD
SOHC: The intake manifold system is composed ofthe
aluminum cast common chamber and intake
manifold attached with six fuel injectors.
DOHC: The intake manifold system is composed of the
aluminum cast common chamber duct having
the induction
control valve, common chamber
and intake
manifold attached with six fuel
injectors.
EXHAUST MANIFOLD
The exhaust manifold is made of nodular cast iron.
PISTONS AND CONNECTING RODS
Aluminum pistons are used after selecting the grade
that meets the cylinder bore diameter. Each piston has
two compression rings and one oil ring. The piston pin
made
of chromium steel is offset 1 mm toward the
thrust side, and the thrust pressure
of piston to the
cylinder wall varies gradually as the piston travels. The
connecting rods are made
of forged steel. The
connecting rod bearings are graded
for correct size
selection.
ENGINE (V6 3.2L DOHC AND SOHC) 6A1-3
CRANKSHAFT AND BEARINGS
The crankshaft is made of Ductile cast-iron.Pins and
journals are graded for correct size selection for their
bearing.
OIL PUMP
The trochoid-type oil pump is driven by crankshaft.
Operation and service procedures are described in this
section.
ENGINE LUBRICATION
The oil discharged by a trochoid-type oil pump driven
by the crankshaft is fed through full-flow oil filter and
engine
coolant cooled oil cooler up to the oil gallery
provided under the crankshaft bearing cap. The oil is
then
led to the crankshaft journals and cylinder head.
The crank pins are
lubricated with oil from crankshaft
journals through oil holes. Also, an oil jet is fed to each
cylinder from crankshaft journals on the connecting
rod
for piston cleaning. The oil pan flange is sealed with
liquid packing only; do not deform or damage the
flange surface during removal or installation.

6A1-4 ENGINE (V6 3.2L DOHC AND SOHC)
ON-VEHICLE SERVICE
CYLINDER HEAD COVER LH (SOHC)
1••1 REMOVAL
Preparation: • Battery ground cable
1. Ignition wire
• Disconnect from spark plug side.
2. Positive Crankcase Ventilation hose and
Vacuum hose
• Disconnect from common chamber.
• Disconnect vacuum hose from throttle body.
3. Engine harness bracket
• Remove fixing bolts on cylinder head cover.
4. Exhaust Gas Recirculation pipe and valve
• Remove fixing bolts on cylinder head cover.
• Remove two fixing bolts on exhaust manifold.
•
Remove two valve fixing bolts on common
chamber.
5. Cylinder head cover
• Remove 11 fixing bolts, then the cylinder head
cover.
I••IINST ALLA TION
5. Cylinder head cover
• Clean the sealing surface of cylinder head and
cylinder head cover to remove oil and sealing
materials completely.
Apply sealant (TB-12078
/
~
!8;
4
or equivalent) of bead diameter 2-3 mm at four
places of arched area of camshaft brackets on
front and rear sides. (Fig. 6A 1-3)
Application points (Front and rear)
Fig. 6A1-3
• Tighten bolts to the specified torque.
1~1 Torque N·m (lb·in) 8 (69)
•

4. Exhaust Gas Recirculation pipe and valve
• Tighten each fixing bolt to the specified torque.
Valve fixing bolt
1«1 Torque N·m (lb·in) 8 (69)
CYLINDER HEAD COVER RH (SOHC)
1
2
4
ENGINE (V6 3.2L DOHC AND SOHC) 6A1-5
Exhaust manifold fixing bolt
1«1 Torque N·m (lb·ft) I 28 (21)
3. Engine harness bracket
2. Positive Crankcase
Ventilation hose and
Vacuum hose
1. Ignition wire
3
Removal steps
1. Common chamber 2. Ventilation hose
3. Fuel hose
4. Engine hanger
5. Heater pipe
6.
Cylinder head cover
Installation steps
To install, follow the removal
steps in the reverse order.
Fig. 6A1-4
EJ REMOVAL
Preparation: • Battery ground cable
1. Common chamber
• See "Removal and installation of common
chamber".
2. Ventilation hose
• Disconnect from cylinder head cover.
3. Fuel hose
• Disconnect feed and return hoses from fuel
pipes.
• Remove two fuel hose fixing bolts on the
cylinder head cover.
4. Engine hanger
• Remove heat protector on exhaust manifold.
•
Remove bolts and nuts that secure the hanger
to the exhaust manifold and cylinder head.
5. Heater pipe
• Remove heater pipe fixing bolts from the
bracket.
6. Cylinder head cover
• Remove 11 fixing bolts, then the cylinder head
cover.
I•+IINSTALLATION
6. Cylinder head cover
• Clean the sealing surface of cylinder head and
cylinder head cover to remove oil and sealing
materials completely.
Apply sealant (TB-12078
or equivalent) of bead diameter 2-3 mm to four
places of arched area of camshaft brackets on
front and rear sides. (Fig.6A 1-5)
• Tighten bolts to the specified torque.
1«1 Torque N·m (lb·in) 8 (69)

E) REMOVAL
Preparation: Battery ground
1. Common chamber duct
• Refer to "Common chamber removal and
installation" in this section.
2. Common chamber
• Refer to "Common chamber removal and
installation" in this section.
3. Fuel hose
• Disconnect feed and return hose from fuel pipe.
4. Cylinder head cover
I••IINSTALLATION
4. Cylinder head cover
• Clean the sealing surface of cylinder head and
cylinder head cover to remove oil and sealing
materials completely.
Apply sealant (TB-12078
or equivalent) of bead diameter 2-3 mm to four
places of arched area of camshaft brackets on
front and rear sides. (Fig. 6A 1-7)
• Tighten bolts to the specified torque.
1«1 Torque N·m (lb·in) 8 (69)
Application points (Front and rear)
Fig. 6A1-7
3. Fuel hose
• Connect the fuel hose as shown in the Fig. 6A 1-
8.
ENGINE (V6 3.2L DOHC AND SOHC) 6A 1-7
2-7 mm (0.08-0.28 in.)
r-
0-3 mm (0-0.12 in.)
·~(t)yCIIp
Fig. 6A1-8
2. Common chamber
• Refer to "Common chamber removal and
installation" in this section.
1. Common chamber duct
• Refer to "Common chamber removal and
installation" in this section.

·,'
6A1-20 ENGINE (V6 3.2L DOHC AND SOHC)
TIMING BELT
1 3
2
6 12
~ ..
Fig. 6A1-21
1••1 REMOVAL
Preparation: Battery ground cable
1. Air cleaner assembly
2. Radiator upper fan shroud
• Remove from radiator.
3. Cooling fan assembly
• Remove four nuts, then the cooling fan
assembly.
4. Power steering pump drive belt
5. Air Conditioning compressor drive belt
6. Generator drive belt
7. Fan pulley assembly
8. Crankshaft pulley assembly
~ • Using special tool J-8614-01, hold crankshaft
~ pulley.
•
Remove center bolt, then the pulley.
9. Oil cooler hose
• Remove two cooler hose bracket fixing bolts on
the timing cover.
10. Timing belt cover 11.
Pusher
'IT7 CAUTION:
'if The pusher prevents air from entering the oil
chamber. Its rod must always be facing upward.
12. Timing belt
• To prevent the timing belt from getting out of
position, put the alignment mark on the cam
pulley, the crankshaft pulley and the timing belt
before removing the timing belt.
w CAUTIONS:
1) Do not bend or twist the belt, otherwise its core
could be damaged. The belt should not be bent at
a radius
less than 30mm.
2) Do not allow oil or other chemica[ substances to
come in contact with the belt. They will shorten
the
belt life.
3) Do not attempt to pry or stretch the belt with a
screwdriver or any other tool during installation.
4) Store timing belt in a cool and dark place. Never
expose the
belt to direct sunlight or heat. ~
•

I••IINSTALLATION
12. Timing belt
1£4111) Align groove of crankshaft timing pulley with
mark on oil pump. (Fig. 6A 1-22)
1£4112) Align the marks on the camshaft timing
pulleys with the corresponding dots on the
front plate. (Fig. 6A 1-23)
NOTE:
When timing marks are aligned, no pistons will be
on T.D.C.
,-----------------------------,
Fig. 6A1-22
Groove on timing pulley
Alignment mark on~ ad]
timing belt ·~Alignment mark
DOHC ", ' on front plate Q',
SOHC
Fig. 6A1-23 '"-) ,.· (.)~\,'j
1£4113) Install timing belt. Align the dotted alignment
mark on the timing belt with the mark on the
W crankshaft gear. (Fig. 6A1-24, Fig. 6A1-25)
NOTE:
For correct belt installation, the letters the belt
must be able to be read as viewed from the front
of the vehicle. (Fig. 6A 1-25)
It is recommended for easy installation that
the belt be secured with double clips after it is
installed to each pulley. (Fig. 6A 1-26)
ENGINE (V6 3.2L DOHC AND SOHC) 6A1-21
Alignment mark on timing belt Crankshaft gear alignment mark
L~---
t Cylinder head side
Timing belt
Fig. 6A1-24
Fig. 6A1-25
Fig. 6A1-26
Engine rotation direction
~
Align the alignment mark (white line) on the
timing belt with the alignment mark on the RH
bank camshaft timing pulley (on the left side
as viewed from the front of the vehicle).
Secure
the belt with a double clip. (Fig. 6A 1-
27)

12) Remove double clips from pulleys. Turn the
crankshaft
pulley clockwise by two turns.
Measure the rod protrusion to ensure
it is
within the standard. (Fig. 6A 1-31)
Standard
mm (in) I 4 - 6 (0.16 -0.24)
Adjusting bolt
Pusher
Fig. 6A1-31
13) If out of standard, remove pusher, loosen
adjusting bolt, and readjust. Repeat from step
11 ).
Tighten adjusting bolt to the specified torque
1~1 Torque N·m (lb·ft) I 42 (31)
11. Pusher
• Tighten bolt to the specified torque.
1~1 Torque N·m (lb·ft) I 19 (14)
10. Timing belt cover
• Remove crankshaft pulley that was installed in
step
9.
• Tighten bolts to the specified torque.
~~~ Torque N·m (lb·ft) I 17 (12)
9. Oil cooler hose
• Tighten oil cooler hose bracket bolts to the
specified torque.
~~~ Torque N·m (lb·ft) I 22 (16)
8. Crankshaft pulley
l"iQ\1 • Using special tool J-8614-01, hold the
~ crankshaft pulley.
•
Tighten center bolt to the specified torque.
1~1 Torque N·m (lb·ft) 167 (123)
ENGINE (V6 3.2L DOHC AND SOHC) 6A1-23
7. Fan pulley assembly
• Tighten fixing bolt to the specified torque.
~~~ Torque N·m (lb·ft) 22 (16)
6. Generator drive belt
• Engage and adjust.
• Refer to Section 68 "Drive belt adjustment".
5. Air Conditioning drive belt
• Engage and adjust.
• Refer to Section 68 "Drive belt adjustment".
4. Power steering pump drive belt
• Engage and adjust.
• Refer to Section 68 "Drive belt adjustment".
3. Cooling fan assembly
• Tighten nuts to the specified torque.
~~~ Torque N·m (lb·in) I 8 (69)
2. Radiator upper fan shroud
1. Air cleaner assembly