Isuzu N-Series. Manual — part 302
00-20 SERVICE INFORMATION
Item
Regulator
Type
IC
Regulating voltage
V
28 — 29
14.4
±0.3
28 — 29
Vacuum pump
-66.7kPa (-500 mmHg / -9.67 psi) build-
up time
13 seconds or less at 1,000 rpm
4 seconds or less at 5,000 rpm
Maximum vacuum
-90.7 kPa (-680 mmHg / -13.1 psi) or more at 5,000 rpm
Starter motor
Type
Magnetic solenoid-controlled
Model
S25-168
R3.0
S25-168
Rated voltage
V
24
12
24
Rated output
kW
4
3
4
Load characteristics
Terminal voltage
V
18.55
14
18.55
Load current
A
250
890 (MAX)
250
Torque N
⋅m (kg⋅m / lb⋅ft)
14.22 (1.45 / 10.49)
at 1,500 rpm or more
29.4 (2.99 /
21.63)
at 860 rpm or
more
14.22 (1.45 /
10.49)
at 1,500 rpm
or more
Preheating system
Quick-On-Start System II
Exhaust system
Pipe outside diameter
× thickness
Front pipe
mm (in)
60.5
× 2.0 (2.38 × 0.079)
Middle pipe
mm (in)
60.5
× 2.0 (2.38 × 0.079)
Rear pipe
mm (in)
60.5
× 1.6 (2.38 × 0.063)
Silencer type
Circular section-shell construction of triple skin and end plates,
internal construction of baffles and perforated tubes
Inside diameter
mm (in)
Approximately 200 (7.87)
Engine Model
4HG1
4HG1-T
SERVICE INFORMATION 00-21
Engine Model
4HE1-TC (4HE1-XS, XN)
98EPA
4HE1-TC (4HE1-XS)
SPEC. EURO3
Item
Engine type
Four-cycle, overhead camshaft, water cooled
Combustion chamber type
Direct injection
Cylinder liner type
Dry liner, special compound metal
Timing drive system
Gear drive
No. of cylinders — Bore
×
stroke
mm (in)
4 — 110
× 125 (4 — 4.33 × 4.92)
No. of piston rings
Compression rings 3, oil ring 1
Total piston displacement
cm
3
(in
3
)
4751(289.9)
Compression ratio
to : 1
17.3
Compression
pressure
kPa (kg / cm
2
/ psi)
— rpm
3,040 (31/441) — 200
Fuel injection order
1— 3 — 4 — 2
Fuel injection timing
(BTDC)
deg
8
9
Specified fuel type
SAE No. 2 diesel fuel
Idling speed
rpm
775 — 825
Valve system
Valve clear-
ances (At cold):
Intake
mm (in)
0.4 (0.016)
Exhaust
mm (in)
0.4 (0.016)
Valve timing (At valve clearances 0.4
mm (0.016 in))
Intake valves
Open at
(BTDC)
deg
14
Close at
(ABDC)
deg
51
Exhaust valves
Open at
(BBDC)
deg
49
Close at
(ATDC)
deg
16
00-22 SERVICE INFORMATION
Item
Fuel system
Injection pump type
Bosch in-line MI-TICS
Different injection fuel quantity between 98EPA and EURO3, or
XS and XN
Plunger outside diameter
mm (in)
11 (0.433)
Plunger lift
mm (in)
12 (0.472)
Governor type
RLD-M mechanical (Variable speed)
Automatic timer type
Electronic control
Fuel feed pump type
Piston
Injection nozzle opening
Injection nozzle type
Hole type
(with 6
× 0.22φ orifices)
(with 6
× 0.21φ orifices)
Pressure
MPa (kg / cm
2
/ psi)
21.6 (220 / 3,128)
Pressure adjustment
Shim adjusted
Main fuel filter type
Disposal spin-on cartridge and remote mounted water separator
Lubricating system
Lubrication method
Full flow pressure circulation
Specified engine oil (API grade)
CD or above
Oil pressure
kPa (kg /cm
2
/ psi)
— rpm
147 (1.5 / 21) — 700
(SAE 10W-30 API CD grade engine oil at 80
°C (176°F))
Oil pump type
Gear type
Oil filter type
Spin-on cartridge
Oil capacity
lit (US / UK gal)
13 (3.43 / 2.86)
Oil cooler type
Water cooled
Cooling system
Radiator type
Corrugated fin with reserve tank
Coolant capacity
lit (US / UK gal)
11 (3.70 / 3.08)
Water pump type
Centrifugal impeller, V-belt drive
Pump to crankshaft speed
ratio
to : 1
1.19
Delivery volume
lit (US / UK gal)/min
200 (52.8 / 44.0)
(Pump speed at 3,300 rpm Water temperature at 82
°C (180°F))
Pump bearing type
Double row shaft
Thermostat type
Wax pellet
Valve initial opening tem-
perature
°C (°F)
With jiggle valve: 85
± 1.5 (182 — 188)
Without jiggle valve Primary: 82
± 2 (176 — 183)
Secondary: 85
± 2 (181 — 189)
Valve lift
mm (in)
With jiggle valve: 8 (0.3) or more at 100
°C (212°F)
Without jiggle valve: 8 (0.3) or more at 95
°C (203°F)
Engine Model
4HE1-TC (4HE1-XS, XN)
98EPA
4HE1-TC (4HE1-XS)
SPEC. EURO3
SERVICE INFORMATION 00-23
Item
Air cleaner type
Dry paper element or wet paper element
Battery type
Model / Volt-amp.hr.
80D26R / 12-65 : 2 pcs
Generator
Type
AC brush with IC regulator and vacuum pump
Voltage
V
12 (For Venezuela)
24 (Except Venezuela)
Drive and rotation
V-belt, clockwise viewed from the drive pulley
Ground polarity
Negative
Maximum output
V / A / rpm
12 / 80 at 5,000 (Hitachi)
(For Venezuela)
24 / 50 at 5,000, 24 / 60 at 5,000 (Hitachi)
24 / 80 at 5,000 (Hitachi)
(Except Venezuela)
Maximum speed
rpm
7,500 — 10,000
Regulator
Type
IC
Regulating voltage
V
28 — 29 (Except Venezuela)
Vacuum pump
-66.7 kPa (-500 mmHg / -9.67 psi)
build-up time
13 seconds or less at 1,000 rpm
4 seconds or less at 5,000 rpm
Maximum vac-
uum
kPa (mmHg / psi)
-90.7 (-680 / -13.1) or more at 5,000 rpm
Starter motor
Type
Magnetic solenoid-controlled
Model
R3.0 (For Venezuela)
S25-505D (Except Venezuela)
Rated voltage
V
12 (For Venezuela)
24 (Except Venezuela)
Rated output
kW
3 (For Venezuela)
4.5 (Except Venezuela)
Load characteristics
Terminal voltage
V
14.3 (Except Venezuela)
Load current
A
890 (MAX) (For Venezuela)
400 (Except Venezuela)
Torque N
⋅m (kg⋅m / lb⋅ft)
29.4 (2.99 / 21.63) at 860 rpm or more (For Venezuela)
25.0 (2.55 / 18.4) at 1,000 rpm or more (Except Venezuela)
Engine Model
4HE1-TC (4HE1-XS, XN)
98EPA
4HE1-TC (4HE1-XS)
SPEC. EURO3
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