Isuzu N-Series. Service manual — part 552
SERVICE INFORMATION 00-23
Lubrication Chart
4JB1, 4JB1-TC, 4JG2, 4JH1-TC, Oil Filter & Oil Cooler
Operating Pressure
Oil filter relief valve (1): 559 — 618 kPa (5.7 — 6.3 kg/cm
2
/81 — 90 psi)
Oil cooler safety valve (2): 314 — 373 kPa (3.2 — 3.8 kg/cm
2
/46 — 54 psi)
Oil filter safety valve (3): 78 — 118 kPa (0.8 — 1.2 kg/cm
2
/11 — 19 psi)
Oil pressure switch (4): 29.4 — 49.0 kPa (0.3 — 0.5 kg/cm
2
/4.3 — 7.1 psi)
The 4J Series engine lubricating system is a full flow type.
Lubricating oil is pumped from the oil pump to the cylinder body oil gallery through the oil cooler and the oil filter (re-
placeable type oil filters have on oil cooler). It is then delivered to the vital parts of the engine from the cylinder body
oil gallery.
N6A3001E
00-24 SERVICE INFORMATION
MAIN DATA AND SPECIFICATIONS
Main Data and Specifications
Notice:
G.EXP: General Export Model
EC: European Countries
Emission Gas Control Standard
′91/542A: Euro 1
′91/543 B: Euro 2
Engine model
4JB1 / 4JB1-TC
4JG2
4JH1-TC
Item
Engine type
Four-cycle, overhead valve, water injection
Combustion chamber type
Direct injection
Swirl
Direct injection
Cylinder liner type
Dry type, chrome plate, stainless steel tube
Timing train system
Gear drive
Gear and Belt Drive
Gear drive
No. of cylinders
— Bore
× stroke
mm (in)
4 — 93
× 102
(3.66
× 4.02)
4 — 95.4
× 107
(3.76
× 4.21)
4 — 95.4
× 104.9
(3.76
× 4.16)
No. of piston rings
Compression rings: 2 / Oil ring: 1
Total piston dis-
placement
cm
3
(in
3
)
2,771 (169.0)
3,059 (186.6)
2,999 (183.3)
Compression ratio (to 1)
18.2 (4JB1)
18.1 (4JB1-TC)
20.1
18.3
Compression
pressure
kPa (kg/cm
2
/psi)
3,038 (31/441)
3,334 (34/483.8)
2,746 (28/398)
Engine weight
(Dry)
N (kg/lb)
Approximately
2,245 (229/505)
(4JB1)
2,511 (256/564)
(4JB1-TC)
Approximately
2,403 (245/540)
Approximately
2,500 (255/562)
Fuel injection order
1 — 3 — 4 — 2
Fuel injection tim-
ing
deg BTDC 12 (
′91/542A)
(4JB1)
BTDC 4 (4JB1-TC)
TDC 0
° (Belt ′91/
542B)
Not Adjustment
Specified fuel type
SAE No. 2 diesel fuel
Idling speed
rpm
750 — 790
700 — 740
675 — 725
Valve clearance
(AT cold)
Intake: mm (in)
0.40 (0.016)
Exhaust: mm (in)
0.40 (0.016)
Valve clearance
(AT hot)
Intake: mm (in)
0.45 (0.018)
Exhaust: mm (in)
0.45 (0.018)
Intake valves
Open at (BTDC)
deg
24.5
Close at (BTDC)
deg
55.5
Exhaust valves
Open at (BTDC)
deg
54
Close at (BTDC)
deg
26
SERVICE INFORMATION 00-25
Engine model
4JB1 / 4JB1-TC
4JG2
4JH1-TC
Item
Lubrication system
Lubrication method
Pressurized circulation
Specified engine oil (API grade)
CC (4JB1)
CD (4JB1-TC)
CC
CD
Oil pump type
Gear
Oil filter type
Disposable cartridge (Spin-on) Paper element
Oil capacity
(Including oil filter)
lit (US/UK gal)
6.6 — 7.1 (1.74 — 1.87/2.62 — 2.82)
(For EC 6.2 — 8.2 (2.17 — 1.64/1.36 —
1.80))
6.0 — 8.0 (1.59 —
2.11/2.38 — 3.18)
Oil cooler type
Water cooled
Fuel system
Injection pump type
Bosch distributor
Bosch VP44
Governor type
Mechanical (Partially variable speed) (For
EC Variable speed)
Electronically con-
trolled fuel injection
system
Injection nozzle type
Hole
Pinttle
Hole
Injection nozzle
opening pressure
kPa (kg/cm
2
/psi)
18,142 (185/2,631)
(4JB1)
1st: 19,500 (199/
2,830)
2nd: 26,500 (270/
3,840) (4JB1-TC)
14,710 (150/2,133)
1st: 19,500 (199/
2,830)
2nd: 33,800 (345/
4,906)
Main fuel filter type
Cartridge paper element and water separa-
tor
Cartridge paper ele-
ment with built in
water separator
Air cleaner type
Dry paper element
Generator capac-
ity
V — A (W)
12 — 40 (480) and
12 — 15 (600)
12 — 50
12 — 60 (720)
12 — 80 (960)
Starter motor out-
put
V — kW
12 — 2.0 and 12 —
2.2
12 — 2.0
12 — 2.2
12 — 2.0 (For Tai-
wan)
Turbocharger
IHI RHF4 (4JB1-TC)
IHI RHF5
00-26 SERVICE INFORMATION
Engine Cooling
Starting System
Cooling system
Coolant forced circulation
Radiator
(2 tube in row) Tube type Corrugated
Heat radiation capacity
kcal/h
71400
Heat radiation area
m
2
(ft
2
)
11.78 (126.8)
Front area
m
2
(ft
2
)
0.216 (2.325)
Dry weight
N (kg/lb)
105 (10.7/23.6)
Radiator cap
Valve opening pres-
sure
kPa (kg/cm
2
/psi)
88.2 — 116. 7 (0.899 — 1.199/12.78 — 17.05)
Coolant capacity
lit (lmp.qt./US qt.)
3.1 (2.73/3.28) (For EC 5.8 (5.1/6.13))
Coolant pump
Pulley type
Centrifugal impeller type
Pulley ratio
1.2
Thermostat type
Wax pellet with jiggle valve.
Valve opening
°C (°F)
82 (180)
Valve full open
°C (°F)
95 (203)
Coolant total capacity
lit (lmp.qt./US qt.)
10 (8.80/10.57) (For EC 7.3 (6.42/7.71))
Manufacturer
DENSO
Engine model
4JB1 / 4JB1-TC
4JG2 (G. EXP)
4JH1-TC
Rating
Voltage
V
12
Output
kW
2.0
2.2
2.2
Time
Sec.
30
Number of tooth of pinion
9
Rotating direction (as viewed from pinion)
Clockwise
Weight (approx.)
kg
4.6
5.4
6.0
No-load characteristics
Voltage / current
V/A
11.5/100 or less
11.5/120
Speed
rpm
3700 or more
4000
Load characteristics
Voltage / current
V/A
7.5/500 or less
7.5/500
Torque
N
⋅m (kg⋅m/lb⋅ft)
13.7 (1.4/10.1)
12.7 (1.3/9.4)
Speed
rpm
1200 or more
1400 or more
1400
Locking characteristics
Voltage / current
V/A
2.4/800 or less
2.0/850 or less
2.0/850
Torque
N
⋅m (kg⋅m/lb⋅ft)
18 (1.8/13 or more)
16 (1.6/12) or more
15.7 (1.6/12)
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