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