Isuzu N-Series. Manual — part 360
6A3-92 ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T)
14. Oil Pan
15. Spacer Rubber
Above works refer to “OIL PAN” section in this
manual.
16. Nozzle Cover
• Pour engine oil and coolant into the engine
• Connect battery ground cable
• Start the engine and check for coolant and oil
leakage
N6A0580E
ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T) 6A3-93
FLYWHEEL AND PILOT BEARING
Component
Removal
Preparation
• Disconnect battery ground cable.
1. Transmission Panel
2. Starter
1) Disconnect the battery cable at the starter mo-
tor.
2) Remove the starter assembly from flywheel
housing.
Legend
1. Transmission panel
6. Washer
2. Starter
7. Flywheel assembly
3. Transmission assembly
8. Snap ring
4. Clutch pressure plate assembly
9. Pilot bearing
5. Driven plate
10. Engine side
N6A1638E
6A3-94 ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T)
3. Transmission Assembly
Above works refer to “ENGINE ASSEMBLY” sec-
tion in this manual.
4. Clutch Pressure Plate Assembly
1) Insert the clutch pilot aligner to the clutch as-
sembly.
Clutch Pilot Aligner: 5-8840-2240-0
2) Loosen the pressure plate bolts in numerical
order a little at a time as shown in the illustra-
tion.
3) Remove the pressure plate assembly.
5. Driven Plate
Remove the driven plate with the clutch pilot align-
er.
6. Washer
7. Flywheel Assembly
1) Use the crankshaft stopper to prevent the
crankshaft from turning.
Crankshaft Stopper: 5-8840-2230-0
2) Loosen the flywheel bolts in numerical order a
little at a time as shown in the illustration.
Legend
A. Knock pin
N6A0582E
N6A0352E
Legend
1. Clutch pilot aligner
2. Clutch pressure plate assembly
3. Driven plate
N6A0351E
N6A0427E
ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T) 6A3-95
3) Remove the flywheel stopper and the flywheel
assembly.
8. Snap Ring
Use a snap ring pliers to remove the snap ring from
the flywheel.
9. Pilot Bearing
Inspection and Repair
Flywheel
1. Inspect the flywheel friction surface for excessive
wear and heat cracks.
2. Measure the flywheel thickness (t) between the fly-
wheel friction surface and crankshaft setting face.
If the measured value is between the standard and
the specified limit, the flywheel may be reground.
If the measured value exceeds the specified limit,
the flywheel must be replaced.
Ring Gear
Inspect the ring gear
If the ring gear teeth are broken or excessively worn, the
ring gear must be replaced.
Ring Gear Replacement
REMOVAL
Strike around the edges of the ring gear with a hammer
and chisel to remove it.
INSTALLATION
1. Heat the ring gear evenly with a gas burner to invite
thermal expansion.
Legend
1. Washer
2. Snap ring
3. Pilot bearing
Flywheel Thickness (t)
mm (in)
Engine model
Standard
Limit
Others
31.4 — 31.6
(1.236 — 1.244)
31.0 (1.220)
4HG1-TC
37.4 — 37.6
(1.472 — 1.480)
37.0 (1.457)
Flywheel Friction Surface Roughness
mm (in)
Less than 0.006 (0.00024)
N6A0586E
N6A0587E
N6A0588E
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