Isuzu N-Series. Manual — part 301
00-16 SERVICE INFORMATION
Item
Injection nozzle type
Injection nozzle type
Hole type (with 5 orifices)
Pressure
MPa (kg / cm
2
/ psi)
18.1 (185 / 2,631)
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)
10.5 (2.77 / 2.31)
Oil cooler type
Water cooled
Cooling system
Radiator type
Corrugated fin with reserve tank
Coolant capacity
lit (US / UK gal)
12 (3.17 / 2.64)
Water pump type
Centrifugal impeller, V-belt drive
Pump to crankshaft speed
ratio
to : 1
1.16 (175 / 151)
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: 82
±1.5 (177 — 182)
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)
Air cleaner type
Dry paper element
Battery type
Volt-amp.hr.
55D23R / 12 — 60 : 2 pcs
Generator
Type
AC brush with IC regulator and vacuum pump
Voltage V
24
Drive and rotation
V-belt, clockwise viewed from the drive pulley
Ground polarity
Negative
Maximum output
A
50 at 5,000 rpm (For Indone-
sian)
60 at 5,000 rpm
80 at 5,000 rpm
Maximum speed
rpm
7,500 — 10,000
Engine Model
4HF1
4HF1-2
SERVICE INFORMATION 00-17
Item
Regulator
Type
IC
Regulating voltage
V
28 — 29
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 vacuum
-90.7 kPa (-680 mmHg / -13.1 psi) or more at 5,000 rpm
Starter motor
Type
Magnetic solenoid-controlled
Model
S25-168
Rated voltage
V
24
Rated output
kW
4.0
Load characteristics
Terminal voltage
V
18.55
Load current
A
250
Torque N
⋅m (kg⋅m / lb⋅ft)
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
4HF1
4HF1-2
00-18 SERVICE INFORMATION
Engine Model
4HG1
4HG1-T
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 — 115
× 110 (4 — 4.53 × 4.33)
No. of piston rings
Compression rings: 2, Oil ring: 1
Total piston displacement
cm
3
(in
3
)
4570 (278.9)
Compression ratio
to : 1
19
Compression
pressure
kPa (kg / cm
2
/ psi)
— rpm
3,226 (32.9/468) — 200
Fuel injection order
1 — 3 — 4 — 2
Fuel injection timing
(BTDC)
deg
9
7 (Except Colombia)
9 (For Colombia)
Specified fuel type
SAE No. 2 diesel fuel
Idling speed rpm
550 — 600
600 — 650
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
18
Close at
(ABDC)
deg
50
Exhaust valves
Open at
(BBDC)
deg
51
Close at
(ATDC)
deg
17
Fuel system
Injection pump type
Bosch in-line type with automatic timer
Plunger outside diameter
mm (in)
9.5 (0.374)
10.5 (0.413)
Plunger lift
mm (in)
11.0 (0.433)
Governor type
RLD-F mechanical (Variable speed)
Automatic timer type
SCDM, centrifugal, flyweight
Fuel feed pump type
Piston
SERVICE INFORMATION 00-19
Item
Injection nozzle opening
Injection nozzle type
Hole type (with 5 orifices)
Pressure
MPa (kg / cm
2
/ psi)
18.1 (185 / 2,631)
1st 18.1 (185 / 2,631)
2nd 21.1 (215 / 3,057)
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)
10.5 (2.77 / 2.31)
Oil cooler type
Water cooled
Cooling system
Radiator type
Corrugated fin with reserve tank
Coolant capacity
lit (US / UK gal)
12 (3.17 / 2.64)
Water pump type
Centrifugal impeller, V-belt drive
Pump to crankshaft speed
ratio
to : 1
1.19 (175 / 147)
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: 82
±1.5 (177 — 182)
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)
Air cleaner type
Dry paper element or oil bath
Battery type
Volt-amp.hr.
75D23R / 12-65 : 2 pcs
Generator
Type
AC brush with IC regulator and vacuum pump
Voltage V
24
12
or
24
Drive and rotation
V-belt, clockwise viewed from the drive pulley
Ground polarity
Negative
Maximum output
A
35 at 5,000 rpm
50 at 5,000 rpm
60 at 5,000 rpm
80 (12V) at 5,000 rpm
Maximum speed
rpm
7,500 — 10,000
Engine Model
4HG1
4HG1-T
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