Isuzu N-Series. Manual — part 732
6E-350 Engine Control System (4HK1)
3. Remove the fuel feed hose.
4. Disconnect the fuel temperature sensor and the
fuel rail pressure regulator harness connector from
the fuel supply pump.
5. Remove the fuel supply pump attachment bolts
and nuts, then remove the fuel supply pump.
Notice:
One of the attachment bolt (1) secures the fuel supply
pump to the flywheel housing as denoted in the picture
below.
6. Use a gear puller to remove the fuel supply pump
gear and the O-ring.
7. Loosen the 3 bolts holding the fuel supply pump
bracket. Remove the bracket and the O-ring.
Legend
1. Fuel Supply Pump
2. O-Ring
3. Fuel Supply Pump Bracket
Installation Procedure
1. Install the O-ring to the fuel supply pump.
2. Install the pump to the bracket and tighten the 3
bolts to the specified torque.
Tighten:
Bolts to 19 N
⋅m (1.9 kg⋅m / 14 lb⋅ft)
Caution:
Take care not to twist the O-ring.
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Engine Control System (4HK1) 6E-351
Legend
1. Fuel Supply Pump
2. O-Ring
3. Fuel Supply Pump Bracket
3. Align the fuel supply pump shaft key and gear.
Install the gear and tighten the nut to the specified
torque.
There is a round alignment mark on the gear
(white paint).
Tighten:
Nut to 64 N
⋅m (6.5 kg⋅m / 47 lb⋅ft)
Legend
1. Fuel Supply Pump
2. Fuel Supply Gear
3. Nut
4. Apply white paint to the top of the fuel supply pump
gear tooth directly above the stamped ‘O’ mark.
Refer to the illustration.
5. Turn the crankshaft in the normal direction of
engine rotation until the No.1 or No.4 cylinder is at
TDC on the compression stroke.
Refer to illustration.
Notice:
There are 2 timing marks on the crankshaft pulley.
Mark (1) is near the front cover and is used to bring the
4HK1-TC engine to TDC.
Mark (2) is not applicable to this engine.
Be sure to use mark (1) when bringing the engine to
TDC.
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6E-352 Engine Control System (4HK1)
6. Remove the oil drain adapter.
7. Install the O-ring to the fuel supply pump.
8. Align the slits as shown in the illustration.
9. Insert the stud bolts into the guides and
temporarily tighten them.
Caution:
• If the stud bolts (cylinder block side) have been
loosened or replaced, apply Locktite No. 262 to the
recessed portion of the bolts.
• Check that the round alignment mark (white paint) is
positioned as shown in the illustration when viewed
from the plug hole. If necessary, reposition the gear.
• Tighten the stud bolts and the nuts to the specified
torque.
Tighten:
Nuts to 50 N
⋅m (5.1 kg⋅m / 37 lb⋅ft)
Bolts to 76 N
⋅m (7.7 kg⋅m / 56 lb⋅ft)
Legend
1. Plug Hole
2. Alignment Mark
10. Apply a light coat of engine oil to the O-ring.
11. Install the oil drain adapter to the plug hole.
Tighten the bolt to the specified torque.
Tighten:
Bolt to 8 N
⋅m (0.8 kg⋅m / 69 lb⋅in)
Legend
1. Oil Drain Adapter
2. O-Ring
12. Connect the fuel temperature sensor and the
suction control valve connectors to the fuel supply
pump.
13. Install the fuel feed hose.
14. Install the throttle assembly.
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Engine Control System (4HK1) 6E-353
• Coat the fluid gasket and mount within 7
minutes.
Tighten:
Throttle assembly to 24 N
⋅m (2.4 kg⋅m / 17 lb⋅ft)
• Install the intake throttle valve chamber hose.
Legend
1. Intake throttle Valve Chamber
15. Install the fuel pipe and fuel leak-off pipe.
Important:
In order to make the fuel supply pump characteristic
learn into the ECM, let the engine idle until warm-up. If
the fuel system DTC's stored in the meantime, once
clear DTC and warm-up the engine again.
16. Inspect for a proper engine running condition and
for no DTC's. Refer to the Diagnostic System
Check-Engine Controls if needed.
Fuel System Air Bleeding
Legend
1. Priming Pump
2. Air Bleed Plug
1. Before starting the engine
a. Fit a tray below the fuel filter (below the air
bleed plug).
b. Loosen the plug adequately and operate the
priming pump more than 20 times until the fuel
overflows from plug hole.
c. Tighten the plug, and operate the priming pump
more than 10 times until it is filled with fuel.
After waiting for approximately a minute, loosen
the plug and bleed off the air in the fuel filter.
(This work must be repeated a minimum of
three times until no more air comes out from the
plug.)
d. Tighten the plug firmly and wipe the fuel in the
surrounding area. Operate the priming pump
(10 to 15 times) till it is filled with fuel and then
send fuel to the engine.
2. After starting the engine
a. Start the engine by rotating the starter without
depressing the accelerator pedal.
b. After starting, maintain the idling rotation for 5
seconds.
c. Slowly rotate the idling control knob clockwise
and maintain it for 3 minutes.
d. Fully depress the accelerator pedal and
increase the rotations to maximum. (Repeat
this operation several times)
e. Rotate the idling knob counterclockwise and
return to idling mode.
Caution:
If the air bleeding work is insufficient then it could lead
to faults in the engine. Therefore, the procedures after
starting the engine should always be implemented.
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N6A6362E
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