2004 ISUZU TF SERIES recommended oil

6-12 ENGINE DIAGNOSIS (C24SE)
Engine Oil Consumption Excessive
Condition Possible cause Correction
Oil leaking Oil pan drain plug loose Retighten or replace gasket
Oil pan setting bolds loosened Retighten
Oil pan gasket broken Replace gasket
Front cover retaining bolts loose
or gasket broken Retighten or replace gasket
Head cover retaining bolts loose
or gasket broken Retighten or replace gasket
Oil filter adapter cracked Replace
Oil filter attaching bolt loose or
rubber gasket broken Retighten or replace oil filter
Crankshaft front or rear oil seal
defective Replace oil seal
Oil pressure unit loose or broken Retighten or replace
Blow-by gas hose broken Replace hose
Engine/Transmission coupling
area Replace oil seal
Oil leaking into combustion
chambers due to poor seal in
valve system Valve stem oil seal defective Replace
Valve stem or valve guide worn Replace valve and valve guide
Oil leaking into combustion
chambers due to poor seal in
cylinder parts Cylinders and pistons worn
excessively Rebore cylinder and replace
pistons and others
Piston ring gaps incorrectly
positioned Correct
Piston rings set with wrong side
up Correct
Piston rings sticking Rebore cylinder and replace
pistons and others
Piston ring and ring groove worn Replace pistons and others
Return ports in oil rings clogged Clean piston and replace rings
Crank case ventilation, Positive
Crankcase Ventilation System
malfunctioning Positive Crankcase Ventilation
Hose clogged Clean
Others Improper oil viscosity Use oil of recommended S.A.E.
viscosity
Continuous high speed driving
and or severe usage such as
trailer towing Continuous high speed operation
and or severe usage will normally
cause increased oil consumption

ENGINE MECHANICAL (C24SE) 6A-3
PAGE
ENGINE EXTERNAL PARTS ............................................................................................ 6A-65
Radiator ....................................................................................................................... 6A-65
Thermostat................................................................................................................... 6A-66
Water Pump ................................................................................................................. 6A-66
Coating sealing surfaces with Silicone Grease ....................................................... 6A-67
Alternator ..................................................................................................................... 6A-67
Starter .......................................................................................................................... 6A-67
V-belt Tension of Alternator ....................................................................................... 6A-68
FUEL INJECTION SYSTEM.............................................................................................. 6A-69
Map Sensor.................................................................................................................. 6A-69
Pressure Regulator ..................................................................................................... 6A-69
ECM (Engine Control Module).................................................................................... 6A-69
ECT ............................................................................................................................... 6A-70
Idle Air Control(IAC) Valve.......................................................................................... 6A-70
Ignition Coil ................................................................................................................. 6A-70
Crank Position Sensor................................................................................................ 6A-71
FUEL INJECTOR .............................................................................................................. 6A-72
Knock Sensor .............................................................................................................. 6A-72
Oxygen Sensor ............................................................................................................ 6A-73
Throttle Valve Position Sensor .................................................................................. 6A-73
Acclelerator Pedal and Cable..................................................................................... 6A-73
Air Cleaner Filter ......................................................................................................... 6A-74
Spark Plug Thread ...................................................................................................... 6A-75
TECHNICAL DATA ........................................................................................................... 6A-76
Recommended Troque Values................................................................................... 6A-87
SPECIAL SERVICE TOOL................................................................................................ 6A-88

ENGINE MECHANICAL (C24SE) 6A-13
Valve System C24SE
Actuation Type Direct-acting Inverted Bucked Tappet
Valve Clearance Adjustment Hydraulic
Valve Rotor Type None
Inlet-Valve Material Chromium Alloyed Steel
-Seat Insert Material Sintered Iron
Exhaust-Valve Material Head: Cr-Mn-Ni Alloyed Shaft: Cr-Si Alloyed &Cr plated
-Seat Insert Material Sintered Iron
Valve Spring Material GME 06 100-C1
Valve Guide Material QS 13 MR 00
Valve Seal Type Lip

Water Pump C24SE
Type Centrifugal
Drive-Material &Type HNBR Toothed-belt
Bearing Type Double Row Ball
Shaft Seal Type Mechanical Ceramic

Thermostat-Coolant C24SE
Type Bypass

Oil Pump & Filter C24SE
Type Gear Pump
Location Front of Engine
Drive Direct Crankshaft Driven
Filter Type Full Flow with Bypass for blocked filter

Oil & Oil Reservoir C24SE
Reservoir-Description & Location 1-piece below Engine
Reservoir Material Aluminum Alloy (pressure cast)
Replacement Oil Fill Volume
-With Filter change 4.25liters
-Without Filter change 4.00liters
Recommended Oil-Run-in 10W/30SG
-Service (above-18C) 10W/40SG
-Service (below-18C) 5W/30SG
Oil Classification API&CCMC

Ignition Components C24SE
Spark Plugs Conventional
Type Electronic Spark Control
No. of Coils &Type 2 Solid State
Coil Location Engine-mounted
Ignition Lead Type Inductive (hi-resistance)

6A-50 ENGINE MECHANICAL (C24SE)

Clean
Sealing surfaces.



013RW004









Installation
1. Apply a bead of Sealing Compound, TB120TC or eguivalent to joint of oil pump.
2. Apply the recommended light gasket to the oil pan fitting surface as shown in the illustration.
3. Install the bearing bridge.
4. Install baffle plate, or reuse baffle plate.

Caution
Baffle plates can be retrofitted without difficulty - replace baffle
plate.

5. Install oil intake pipe to oil pump and oil intake pipe bracket to cylinder block.
6. Install oil pan and new gasket to cylinder block and insert bolts with Locking Compound 15 10 177 (90 167 347).
Maximum assembly time including torque check is 10
min.
7. Return the power steering unit (and front axle [4 
4 model
only]).
8. Install the crossmember.

Tighten (Torque)
Oil intake pipe to oil pump -8N

m (0.8 kgf

m)
Oil intake pipe bracket to cylinder block - 6 N

m (0.6 kgf

m)
Oil pan to cylinder block - 8 N

m (0.8 kgf

m)
Bearing bridge to cylinder block – 8 N

m (0.8 kgf

m)

ENGINE MECHANICAL (C24SE) 6A-59






Bypass Valve
Removal
1. Remove oil filter.
2. Remove bypass valve by cutting thread in locking disc
with M 10 tap (3rd stage), turning in M 10 bolt and taking
out bypass valve from seating.
Installation
1. Install bypass valve using drift (diameter approx.
15mm/0.6in.).






Oil Filter
Removal
1. Remove oil filter using commercially available tool.

Installation
1. Install oil filter by hand and oil seal ring.
2. Fill up engine oil while preventing overflow.



Oil Pump
Removal
1. Remove rear toothed belt cover, and oil pan according to
the corresponding operations.
2. Remove oil filter, wiring plug from oil pressure switch, oil
pump from cylinder block, and oil pressure switch from
oil pump.









Clean
Sealing surfaces

Installation
1. Install oil pressure switch to oil pump, oil pump to cylinder
block, oil pan, bearing bridge wiring plug, oil filter and
toothed belt cover.

Tighten (Torque)
Oil pressure switch to oil pump - 30 N

m (3.2 kgf

m)
Oil pump to cylinder block - 6 N

m (0.6 kgf

m)
Oil intake pipe to oil pump - 8 N

m (0.8 kgf

m)
Intake pipe bracket to cylinder block - 8 N

m (0.8 kgf

m)
*Insert bolts with Locktite (Refer to General Description
Recommended Liguid Gasket)

ENGINE MECHANICAL (C24SE) 6A-87
Recommended Torque Values
Nm (kgfm)

Bearing cover to cylinder block ....................................................................................... 60
1) 6.1 +40
to 50

Bracket for alternator to cylinder block ............................................................................ 40 4.1
Bracket for engine damping block to transmission ......................................................... 60
2) 6.1
Bracket for engine damping block to engine block ......................................................... 60 6.1
Bracket for pump/compressor to engine block ............................................................... 35 3.6
Camshaft housing cover to housing ................................................................................ 8 0.8
Camshaft timing gear to camshaft .................................................................................. 50 5.1
Clamping bracket for alternator to intake manifold ......................................................... 25 2.5
Clamping bracket to alternator ........................................................................................ 25 2.5
Con-rod bearing cap to con-rod ...................................................................................... 35
1) 3.5 +45
to 60

Crankshaft pulley bolts .................................................................................................... 20 2.0
Cylinder head to cylinder block ........................................................................................ 25
1)2) 2.5 +90
+90

+90

Engine damping block to engine bracket ........................................................................ 8.5 8.7
Engine damping block to side member ........................................................................... 52
1) 5.3
Exhaust manifold to cylinder head .................................................................................. 22 2.2

1) Use new bolts
2) Use new locking plates


Recommended Torque Values
Nm (kgfm)

Flywheel to crankshaft ..................................................................................................... 65
1) 6.6 +30
to 45

Front exhaust pipe to exhaust manifold .......................................................................... 25 2.5
Guide sleeve for pressure bearing to transmission ......................................................... 22 2.2
Intake manifold to cylinder head ...................................................................................... 22 2.2
Lower alternator bracket ................................................................................................. 25 2.5
Oil drain plug to oil pan .................................................................................................... 45 4.6
Oil intake pipe bracket to cylinder block .......................................................................... 6
2) 0.6
Oil intake pipe to oil pump ............................................................................................... 8 0.8
Oil pan to cylinder block .................................................................................................. 8
2)3) 0.8
Bearing bridge to cylinder block ...................................................................................... 8 2)3) 0.8
Oil pressure switch to oil pump ....................................................................................... 30 3.2
Pump for power steering (ribbed V-belt) to engine block ................................................ 30 3.2
Spark plugs in cylinder head ........................................................................................... 20 2.3
Starter support to cylinder block ...................................................................................... 25 2.5
Starter to cylinder block - engine side ............................................................................. 45 4.6
Starter to cylinder block - transmission side .................................................................... 75 7.6
Thermostat housing to cylinder head .............................................................................. 15 1.5
Toothed belt drive gear to crankshaft .............................................................................. 130
1) 13.3
Toothed belt front cover .................................................................................................. 4 0.4
Toothed belt rear cover ................................................................................................... 6 0.6
Toothed belt tension roller to oil pump ............................................................................ 20 2.3
(M10) ............................................................................ 45 4.6
Transmission to engine block ......................................................................................... 76 7.7
(M12) ............................................................................ 60 6.1
Water pump to cylinder block .......................................................................................... 17 1.7

1) Use new bolts
2) Use Locking Compound
3) Maximum installation time - 10 minutes

6E–54 ENGINE DRIVEABILITY AND EMISSIONS
GENERAL DESCRIPTION FOR ELECTRIC
IGNITION SYSTEM
The engine use two ignition coils, one per two cylinders.
A two wire connector provides a battery voltage primary
supply through the ignition fuse.
The ignition control spark timing is the ECM’s method of
controlling the spark advance and the ignition dwell.
The ignition control spark advance and the ignition dwell
are calculated by the ECM using the following inputs.
Engine speed
Crankshaft position (CKP) sensor
Engine coolant temperature (ECT) sensor
Throttle position sensor
Vehicle speed sensor
ECM and ignition system supply voltage
Ignition coil works to generate only the secondary
voltage be receiving the primary voltage from ECM.
The primary voltage is generated at the coil driver
located in the ECM. The coil driver generate the primary
voltage based on the crankshaft position signal. In
accordance with the crankshaft position signal, ignition
coil driver determines the adequate ignition timing and
also cylinder number to ignite.
Ignition timing is determined the coolant temperature,
intake air temperature, engine speed, engine load,
knock sensor signal, etc.
Spark Plug
Although worn or dirty spark plugs may give satisfactory
operation at idling speed, they frequently fail at higher
engine speeds. Faulty spark plugs may cause poor fuel
economy, power loss, loss of speed, hard starting and
generally poor engine performance. Follow the
scheduled maintenance service recommendations to
ensure satisfactory spark plug performance. Refer to
Maintenance and Lubrication.
Normal spark plug operation will result in brown to
grayish-tan deposits appearing on the insulator portion
of the spark plug. A small amount of red-brown, yellow,
and white powdery material may also be present on the
insulator tip around the center electrode. These
deposits are normal combustion by-products of fuels
and lubricating oils with additives. Some electrode wear
will also occur. Engines which are not running properly
are often referred to as “misfiring.” This means the
ignition spark is not igniting the air/fuel mix ture at the
proper time. While other ignition and fuel system causes
must also be considered, possible causes include
ignition system conditions which allow the spark voltage
to reach ground in some other manner than by jumping
across the air gap at the tip of the spark plug, leaving
the air/fuel mix ture unburned. Misfiring may also occur
when the tip of the spark plug becomes overheated and
ignites the mixture before the spark jumps. This is
referred to as “pre-ignition.”
Spark plugs may also misfire due to fouling, ex cessive
gap, or a cracked or broken insulator. If misfiring occursbefore the recommended replacement interval, locate
and correct the cause.
Carbon fouling of the spark plug is indicated by dry,
black carbon (soot) deposits on the portion of the spark
plug in the cylinder. Ex cessive idling and slow speeds
under light engine loads can keep the spark plug
temperatures so low that these deposits are not burned
off. Very rich fuel mix tures or poor ignition system output
may also be the cause. Refer to DTC P1167.
Oil fouling of the spark plug is indicated by wet oily
deposits on the portion of the spark plug in the cylinder,
usually with little electrode wear. This may be caused by
oil during break-in of new or newly overhauled engines.
Deposit fouling of the spark plug occurs when the
normal red-brown, yellow or white deposits of
combustion by-products become sufficient to cause
misfiring. In some cases, these deposits may melt and
form a shiny glaze on the insulator around the center
electrode. If the fouling is found in only one or two
cylinders, valve stem clearances or intake valve seals
may be allowing ex cess lubricating oil to enter the
cylinder, particularly if the deposits are heavier on the
side of the spark plug facing the intake valve.
Ex cessive gap means that the air space between the
center and the side electrodes at the bottom of the
spark plug is too wide for consistent firing. This may be
due to improper gap adjustment or to ex cessive wear of
the electrode during use. A check of the gap size and
comparison to the gap specified for the vehicle in
Maintenance and Lubrication will tell if the gap is too
wide. A spark plug gap that is too small may cause an
unstable idle condition. Ex cessive gap wear can be an
indication of continuous operation at high speeds or
with engine loads, causing the spark to run too hot.
Another possible cause is an ex cessively lean fuel
mixture.

ENGINE DRIVEABILITY AND EMISSIONS 6E–55
Low or high spark plug installation torque or improper
seating can result in the spark plug running too hot and
can cause excessive center electrode wear. The plug
and the cylinder head seats must be in good contact for
proper heat transfer and spark plug cooling. Dirty or
damaged threads in the head or on the spark plug can
keep it from seating even though the proper torque is
applied. Once spark plugs are properly seated, tighten
them to the torque shown in the Specifications Table.
Low torque may result in poor contact of the seats due
to a loose spark plug. Over tightening may cause the
spark plug shell to be stretched and will result in poor
contact between the seats. In ex treme cases, ex haust
blow-by and damage beyond simple gap wear may
occur.
Cracked or broken insulators may be the result of
improper installation, damage during spark plug re-
gapping, or heat shock to the insulator material. Upper
insulators can be broken when a poorly fitting tool is
used during installation or removal, when the spark plug
is hit from the outside, or is dropped on a hard surface.
Cracks in the upper insulator may be inside the shell
and not visible. Also, the breakage may not cause
problems until oil or moisture penetrates the crack later.A broken or cracked lower insulator tip (around the
center electrode) may result from damage during re-
gapping or from “heat shock” (spark plug suddenly
operating too hot).
Damage during re-gapping can happen if the gapping
tool is pushed against the center electrode or the
insulator around it, causing the insulator to crack.
When re-gapping a spark plug, make the adjustment
by bending only the ground side terminal, keeping the
tool clear of other parts.
“Heat shock” breakage in the lower insulator tip
generally occurs during several engine operating
conditions (high speeds or heavy loading) and may
be caused by over-advanced timing or low grade
fuels. Heat shock refers to a rapid increase in the tip
temperature that causes the insulator material to
crack.
Spark plugs with less than the recommended amount of
service can sometimes be cleaned and re-gapped, then