Isuzu N-Series. Service 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