Isuzu N-Series. Manual — part 358
6A3-84 ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T)
Notice:
Be careful not to fail to remove the bolts shown in the il-
lustration.
27. Idle Gear A
28. Oil Pump Assembly
Installation
1. Oil Pump Assembly
1) Carefully wipe any foreign material from the cyl-
inder body rear surface.
2) Apply the recommended liquid gasket (Three
Bond 1141E) or its equivalent to the shaded ar-
eas shown in the illustration.
Caution:
Be careful that no liquid gasket gets into the holes in the
arrow-marked portion in the illustration and the inside of
the oil pump cover.
3) Install the oil pump to the cylinder body.
4) Tighten the oil pump to the specified torque.
Tighten:
Oil pump bolt to 31 N
⋅m (3.2 kg⋅m/23 lb⋅ft)
N6A0432E
N6A0562E
N6A0177E
N6A0176E
ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T) 6A3-85
2. Idle Gear A
1) Turn the crankshaft clockwise so that the en-
gagement mark of the crankshaft gear faces to
the shaft center of the idle gear A and the No.1
cylinder piston comes to the top dead center.
2) Align the crankshaft gear with the engagement
mark of the idle gear and install the idle gear A.
Tighten:
Idle gear A bolt to 133 N
⋅m (13.6 kg⋅m/98 lb⋅ft)
3. Flywheel Housing
4. Power Steering Pump Idle Gear
5. Power Steering Pump Idle Gear Cover
Above works refer to “TIMING GEAR REPLACE-
MENT” section in this manual.
6. Oil Pan
7. Spacer Rubber
Above works refer to “OIL PAN” section in this
manual.
8. Crankshaft Rear Slinger
9. Crankshaft Rear Oil Seal
10. Flywheel
Above works refer to “CRANKSHAFT REAR OIL
SEAL” section in this manual.
11. Injection Pump Assembly
Above works refer to “INJECTION PUMP ASSEM-
BLY” section in this manual.
12. Oil Pipe
13. Engine Control Lever Assembly
14. Engine Control Wire
Above works refer to “INJECTION PUMP ASSEM-
BLY” section in this manual.
15. Driven Plate
16. Clutch Pressure Plate Assembly
Above works refer to “TIMING GEAR REPLACE-
MENT” section in this manual.
17. Cylinder Head Gasket
Above works refer to “CYLINDER HEAD” section
in this manual.
18. Cylinder Head Assembly
Above works refer to “CYLINDER HEAD” section
in this manual.
19. Camshaft Bearing Lower
20. Camshaft Assembly
21. Camshaft Bearing Upper
22. Camshaft Bearing Cap
23. Valve Cap
N6A0177E
N6A0178E
N6A0179E
6A3-86 ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T)
Above works refer to “CAMSHAFT ASSEMBLY”
section in this manual.
24. Rocker Arm Shaft Assembly
Above works refer to “ROCKER ARM SHAFT AS-
SEMBLY” section in this manual.
25. Head Cover Gasket
26. Cylinder Head Cover
Above works refer to “CYLINDER HEAD COVER”
section in this manual.
27. Nozzle Cover
28. Engine Assembly
Above works refer to “ENGINE ASSEMBLY” sec-
tion in this manual.
ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T) 6A3-87
OIL RELIEF VALVE
Removal
1. Oil Relief Valve
Inspection and Repair
Make the necessary adjustments, repairs, and part re-
placements if excessive wear or damage is discovered
during inspection.
Valve
Push the valve with a screwdriver to check it for binding.
When the valve is binding, replace the relief valve with a
new one.
Spring
Blow the valve and check it for air leak. When there is
any air leak in the valve, replace it with a new one.
Installation
1. Oil Relief Valve
Tighten:
Oil relief valve to 39 N
⋅m (4.0 kg⋅m/29 lb⋅ft)
N6A0568E
N6A0569E
N6A0568E
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