Isuzu engine 4j series. Manual — part 74
6C - 40 ENGINE FUEL
3. Power Steering Pump Drive Belt (P/S Model)
•
Install power steering pump drive belt and adjust belt
tension.
•
Depress the drive belt mid-portion with a 98N (10
kg/22 lb) force.
Drive Belt Deflection
mm (in)
8 (0.31) - 10 (0.39)
•
Tighten the idler lock nut to the specified torque.
N∙m (Kg∙m/lb ft)
27 (2.8/20)
2. Fan Shroud
•
Install the fan shroud and reservoir tank hose.
1. Cooling Fan Assembly
•
Mount fan pulley, distance piece, and cooling fan
assembly (in this order) on the water pump, and
tighten to the specified torque.
N∙m (Kg∙m/lb in)
8 (0.8/69)
•
Connect battery ground cable.
•
Pour coolant.
•
Start the engine and check coolant leakage.
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ENGINE FUEL 6C - 41
INJECTION TIMING ADJUSTMENT
•
Set No. 1 cylinder to top dead center.
•
Remove injection pump distributor head plug.
•
Cancel wax CSD with the handle of a screw driver.
•
Fit a dial gauge and set lift to 2 mm.
Measuring device: 5-8840-0145-0
•
Set crankshaft damper pulley top dead center mark
about 45° before top dead center from the pointer.
•
Set dial gauge in the "0" position.
•
Turn the crankshaft a little right wise and left wise and
see if the pointer is stable in the "0" position.
•
Turn the crankshaft in the normal direction and read
the measuring device's indication at as follows.
4JB1
BTDC 14°, BTDC 12° (’91/
542A)
4JB1T
BTDC11°
4JB1TC
BTDC4°
4JG2 (Belt Drive Type) ATDC 1° (’91/ 542A)
TDC 0° (’91/ 542B)
" (Gear Drive Type) ATDC 2° (’91/ 542A)
Measuring Device's Indication
mm (in)
Standard
0.5 (0.0197)
•
If it reads abnormal, loosen injection pump fixing nut
and pump bracket adjust bolt, make adjustment by
changing the pump mounting angle, and tighten the
nut and bolt to the specified torque where the dial
indicates the specified valve.
Pump fixing nut
N∙m (Kg∙m/lb∙ft)
24 (2.4/17)
Adjust bolt
N∙m (Kg∙m/lb∙ft)
19 (1.9/14)
•
Remove the measuring device and tighten the
distributor head plug to the specified torque.
N∙m (Kg∙m/lb∙ft)
17 (1.7/12)
CAUTION
•
When installing the distributor head plug, be sure to
use new copper washer.
•
Connect injection pipe.
•
Fit pipe clip where specified.
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6C - 42 ENGINE FUEL
Adjustment of Idling Speed
1) Pull the parking brake and lock the wheels.
2) Set the transmission gear to the neutral position.
3) Start the engine and idle it until the water temperature
gets to 70 to 80°C (158 to176°F).
4) Turn back the idling control button, and remove the
control cable from the control lever (injection pump)
5) Set the engine tachometer.
6) Check the idling rotation.
When the idling rotation is outside the range of the
specified value, adjust it correctly.
Specified value (rpm) = 750 - 790 (4JB1)
700 - 740 (4JG2)
(1) Loosen the lock nut of the idling set bolt.
(2) Rotate the idling set bolt to set the idling rotation to the
specified value.
(3) Tighten the lock knut to lock the set bolt.
(4) Check the tension of the control cable, and remove
any slackening as required.
6C-41-1.tif
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ENGINE FUEL 6C - 43
INJECTION PUMP DATA
TEST CONDITIONS
Items
Conditions
Engine Type
4JB1(Gear)
4JG2(Belt)
(For '91/542B)
4JB1(Gear)
(For '91/542A)
4JG2(Gear)
(For '91/542A)
4JB1TC
4JB1T
Euro 2
Euro 1
Euro 1
Injection Nozzle
ZEXEL Part Number
105780-0000
105780-0000
105780-0060
105780-0060
105780-0060
Bosch Type Number
DN12SD12T
DN12SD12
DN00SD1510
Injection Nozzle holder
ZEXEL Part Number
105780-2080
105780-2080
105780-2150
105780-2150
105780-2150
Bosch Type Number
EF8511/9
EF8511/9
Injection Nozzle
MPa(kg/cm
2
/psi)
14.7 (150 / 2,133)
13.0(133 / 1,891)
Opening Pressure
Injection Line dimensions
mm(in)
Inside Diameter
2 (0.079)
Outside Diameter
6 (0.236)
Length
840 (33.1)
450 (17.7)
Fuel delivery Pressure kPa(kg/cm2/psi)
20 (0.2 / 2.84)
Test Fuel
SAE Standard Test Diesel Fuel (SAE967D)
ISO Standard Test Diesel Fuel (ISO4113)
Test Fuel Temperature
°C (°F)
48 - 52 (118-126)
Identification Numbers
104746-1230
196000-1042
104742-1451
104746-1222
104746-6601
104746-6311
104746-1240
104742-1461
104746-1250
104742-1471
104746-1211
104766-6620
104746-6380
104746-1260
104742-1480
4JG2 (Belt)
104746-6670
104746-1270
104742-1490
(For +91/542A)
104746-1280
104746-1290
104746-1370
Note:
'91/542A ; Euro 1
'91/542B ; Euro 2
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