Isuzu N-Series. Manual — part 336
6A-86 ENGINE MECHANICAL
47. Fan Belt Adjustment
Fan belt tension is adjusted by moving the alterna-
tor.
Tighten:
Bolt to
• (1): 40 N
⋅m (4.1 kg⋅m / 30 lb⋅ft)
• (2): 24 N
⋅m (2.4 kg⋅m / 17 lb⋅ft)
• (3): 46 N
⋅m (4.7 kg⋅m / 34 lb⋅ft)
48. Vacuum Pump Rubber Hose
49. Vacuum Pump Oil Pipe
Tighten:
Cylinder body side pipe to 41 N
⋅m (4.2 kg⋅m / 30 lb⋅ft)
Tighten:
Generator side pipe to 23 N
⋅m (2.3 kg⋅m / 17 lb⋅ft)
50. Fuel Pipe Bracket
51. Tachometer Sensor
Tighten:
Tachometer bolt to 8 N
⋅m (0.8 kg⋅m / 6 lb⋅ft)
52. Oil Filter Assembly
Tighten:
Oil filter bolt to 48 N
⋅m (4.9 kg⋅m / 35 lb⋅ft)
53. Oil Pipe
Tighten:
Oil pipe joint bolt to 17 N
⋅m (1.7 kg⋅m / 12 lb⋅ft)
N6A0037E
N6A0038E
N6A0347E
N6A0348E
ENGINE MECHANICAL 6A-87
54. Engine Control Lever Assembly
Tighten:
Engine control lever bolt to 24 N
⋅m (2.4 kg⋅m / 17 lb⋅ft)
55. Engine Control Wire
56. Driven Plate
Use the clutch pilot aligner to install the driven
plate.
Clutch Pilot Aligner: 5-8840-2240-0
57. Clutch Pressure Plate Assembly
1) Align the clutch pressure plate with the flywheel
knock pin.
2) Tighten the pressure plate bolts to the specified
torque in numerical order.
Tighten:
Clutch pressure plate bolt to 40 N
⋅m (4.1 kg⋅m / 30 lb⋅ft)
58. Cylinder Head Gasket
N6A0285E
N6A0350E
Legend
1. Clutch pilot aligner
2. Clutch pressure plate assembly
3. Driven plate
Legend
A. Knock pin
N6A0351E
N6A0282E
6A-88 ENGINE MECHANICAL
1) When any of the cylinder block, crankshaft,
crankshaft bearing, connecting rod, connecting
rod bearing, and piston is replaced with a new
one, cylinder head gasket thickness should be
determined newly.
2) When replacing the cylinder head gasket alone
without replacing any of the parts mentioned in
1) above, the gasket to be used should be the
same grade as the one used before.
3) Correct the cylinder head gasket thickness is
important. Installing the wrong thickness gas-
ket can result in greatly reduced engine perfor-
mance.
4) There are three cylinder head gaskets avail-
able.
59. Piston Head Projection Measurement
• Select a cylinder head gasket.
• Clean thoroughly the top faces of the piston head
and the cylinder body.
• Use the dial gauge to measure the piston head pro-
jection. Take measurements at two locations for
each cylinder.
• The measurement points of the piston head and
the reference point of the cylinder body are shown
in the illustration.
Measurement points: Points G1 and G2 of the pis-
ton head
Reference point: Point R on the top face of the cyl-
inder body
Notice:
Note that there are three types of a cylinder head gasket
available as shown in the table following, according to
the piston projection.
• For each cylinder, calculate the average value (Ti)
of the piston projection.
• Find the maximum value (Timax) of the average
value (Ti) of each cylinder.
• Based on the Timax obtained, select a gasket of
the appropriate grade.
4HF1/4HF1-2/4HG1-T
Cylinder Head Gasket Selection
N6A0353E
N6A1628E
N6A1396E
ENGINE MECHANICAL 6A-89
4HE1-TC
Cylinder Head Gasket Selection
• Apply a 3 mm (0.12 in) bead or recommended liq-
uid gasket or its equivalent to the shaded areas
shown in the illustration.
• Install the cylinder head gasket with its “PART
NUMBER” mark facing up and toward the left of the
engine.
Caution:
Do not reuse the cylinder head gasket.
60. Cylinder Head Assembly
Above works refer to “CYLINDER HEAD” section
6A3 in this manual.
N6A1397E
N6A0353E
Legend
1. Bead width
φ3
N6A0356E
N6A0105E
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