Isuzu N-Series. Manual — part 345
6A3-32 ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T)
17. Oil Pipe
18. Injection Pump Assembly
1) Remove the injection pump bracket bolts and
the injection pump rear bracket bolts.
2) Then remove the injection pump assembly.
19. Flywheel
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.
3) Remove the flywheel stopper and the flywheel
assembly.
20. Crankshaft Rear Oil Seal
Caution:
Be careful not to damage the crankshaft oil seal contact
surface during the removal procedure.
N6A0425E
N6A0426E
Legend
1. Washer
2. Pilot bearing
N6A0427E
N6A6504E
ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T) 6A3-33
21. Crankshaft Rear Slinger
Use the slinger puller to pull out the slinger.
Slinger Puller: 5-8840-2360-0
22. Spacer Rubber
(Remove the stiffener before removing the spacer
rubber.)
23. Oil Pan
24. Power Steering Pump Idle Gear Cover
25. Power Steering Pump Idle Gear
26. Flywheel Housing
Notice:
Be careful not to fail to remove the bolts shown in the il-
lustration.
27. Idle Gear A
28. Idle Gear B
29. Idle Gear B shaft
Legend
1. Oil seal
2. Slinger
3. Felt
N6A0429E
N6A0430E
N6A0431E
N6A0432E
6A3-34 ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T)
Inspection
Idle Gear Backlash Measurement
1. Set a dial indicator to the timing gear to be mea-
sured.
Hold both the gear to be checked and the adjoining
gear stationary.
2. Move the gear to be checked right and left as far as
possible. Take the dial indicator reading.
Idler Gear End Play Measurement
Insert a feeler gauge between the idler gear and the
thrust collar to measure the gap and determine the idler
gear end play.
If the measured value exceeds the specified limit, the
thrust collar must be replaced.
Idler Gear Shaft Outside Diameter
Use a micrometer to measure the idler gear shaft out-
side diameter.
If the measured value is less than the specified limit, the
idler gear must be replaced.
Idler Gear Inside Diameter
Use an inside dial indicator or an inside micrometer to
measure the idler gear inside diameter.
Timing Gear Backlash Gear to Gear
mm (in)
Standard
Limit
0.10 — 0.17 (0.0039 — 0.0067)
0.30 (0.012)
N6A0433E
N6A0434E
Idler Gear End Play
mm (in)
Standard
Limit
0.058 — 0.115
(0.002 — 0.005)
0.2 (0.008)
Idler Gear Shaft Outside Diameter
mm (in)
Standard
Limit
29.959 — 29.980
(1.1795 — 1.1803)
29.80 (1.1732)
N6A0435E
N6A0436E
ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T) 6A3-35
If the clearance between the idler gear shaft outside di-
ameter and the idler gear inside diameter exceeds the
limit, the idler gear must be replaced.
Installation
1. Idler Gear B Shaft
Tighten:
Idle gear B shaft bolt to 31 N
⋅m (3.2 kg⋅m/23 lb⋅ft)
Apply the engine oil to the idle gear shaft after in-
stallation.
2. Idle Gear B
The face of the idle gear B with longer boss should
be positioned toward the rear side shown in the il-
lustration.
Tighten:
Idle gear B bolt to 110 N
⋅m (11.2 kg⋅m/81 lb⋅ft)
3. 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)
Idler Gear Inside diameter
mm (in)
Standard
Limit
30.000 — 30.021
(1.1811 — 1.1819)
30.100
(1.1850)
Idler Gear Shaft and Idler Gear clearance
mm (in)
Standard
Limit
0.020 — 0.062
(0.0008 — 0.0024)
0.200 (0.0079)
N6A0437E
N6A0438E
N6A0439E
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