Isuzu N-Series. Service manual — part 337
6A-90 ENGINE MECHANICAL
ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T) 6A3-1
ENGINE 4H SERIES
SECTION 6A3
ENGINE
(4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T)
Contents
GENERAL DESCRIPTION . . . . . . . . . 6A3-3
ENGINE MOUNT (RH,LH) . . . . . . . . 6A3-11
CYLINDER HEAD COVER . . . . . . . ...6A3-13
INLET COVER / INLET CASE . . . . . . .. 6A3-15
EXHAUST GAS RECIRCULATION SYSTEM (EGR). 6A3-21
EXHAUST GAS RECIRCULATION SYSTEM (EGR). 6A3-24
EXHAUST MANIFOLD. . . . . . . . . ..6A3-26
TIMING GEAR REPLACEMENT . . . . . ..6A3-29
VALVE GUIDE SEAL & VALVE SPRING . . .6A3-40
ROCKER ARM SHAFT ASSEMBLY. . . . .6A3-45
CAMSHAFT ASSEMBLY . . . . . . . . ..6A3-48
Component . . . . . . . . . . . . . 6A3-48
Removal. . . . . . . . . . . . . . .6A3-48
Installation. . . . . . . . . . . . . ..6A3-49
CYLINDER HEAD . . . . . . . . . . . .6A3-51
CIRCUMFERENCE PARTS OF CYLINDER HEAD..6A3-61
OIL FILTER ASSEMBLY . . . . . . . . ...6A3-67
OIL FILTER CARTRIDGE . . . . . . . . .6A3-69
OIL COOLER. . . . . . . . . . . . . .6A3-70
OIL PAN . . . . . . . . . . . . . . . 6A3-79
OIL PUMP ASSEMBLY . . . . . . . . . .6A3-82
OIL RELIEF VALVE. . . . . . . . . . ...6A3-87
PISTON, PISTON RING, PISTON PIN AND CONNECTING
ROD . . . . . . . . . . . . . . . . ...6A3-88
FLYWHEEL AND PILOT BEARING . . . . ..6A3-93
6A3-2 ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T)
Removal . . . . . . . . . . . . . . 6A3-98
Installation . . . . . . . . . . . . ... 6A3-100
CRANKSHAFT REAR OIL SEAL. . . . . 6A3-104
CRANKSHAFT. . . . . . . . . . . . 6A3-108
CYLINDER BLOCK. . . . . . . . . . . 6A3-122
ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T) 6A3-3
GENERAL DESCRIPTION
The engine is a four-cycle, four-cylinder, in-line, direct
fuel injection type diesel engine with the piston displace-
ment of 4,334 cc. It features a gear driven OHC (over-
head camshaft) timing train and the unique mechanisms
and systems designed for outstanding cleanness, econ-
omy and durability. Its torque characteristics promise
dynamic ride at high speed, high power at low speed,
and smooth and continuous torque at medium to high
ranges.
For 4HF1
For 4HF1
For 4HG1-T
For 4HG1-T
N6A0358E
N6A0359E
N6A0360E
N6A0361E
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