Isuzu N-Series. Service manual — part 348
6A3-44 ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T)
18. Nozzle Cover
• Connect the negative battery cable
• Lower the cab
• Start engine and check for fuel leakage careful-
ly.
N6A0400E
ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T) 6A3-45
ROCKER ARM SHAFT ASSEMBLY
Component
Removal
Preparation
• Disconnect battery ground cable.
• Tilt the cab.
1. Nozzle Cover
2. Cylinder Head Cover
3. Cylinder Head Cover Gasket
4. Rocker Arm Shaft Assembly
1) Loosen the rocker arm shaft bracket nuts and
bolts in numerical order a little at a time and re-
move the rocker arm shaft assembly with the
camshaft brackets.
2) Leave the (1) indicated bolt unremoved on this
occasion, since it is the rocker arm fixing bolt.
Caution:
Failure to loosen the rocker arm shaft bracket nuts and
bolts in numerical order a little at a time will adversely af-
fect the rocker arm shaft.
Legend
1. Nozzle cover
3. Cylinder head cover gasket
2. Cylinder head cover
4. Rocker arm shaft assembly
N6A0464E
N6A0420E
6A3-46 ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T)
Installation
1. Rocker Arm Shaft Assembly
1) Slightly loosen the bolts marked with the arrow
in the illustration.
2) Loosen the rocker arm adjust screws and apply
engine oil to the rocker arm roller portions.
3) Install the rocker arm assembly on the cylinder
head.
4) Tighten the rocker arm shaft breaker nuts and
bolts to the specified torque in numerical order
a little at a time as shown in the illustration.
Tighten:
Rocker arm shaft bracket nut and bolt to
• Nut (A): 27 N
⋅m (2.8 kg⋅m/20 lb⋅ft)
• Bolt (B): 56 N
⋅m (5.7 kg⋅m/41 lb⋅ft)
• Bolt (C): 27 N
⋅m (2.8 kg⋅m/20 lb⋅ft)
5) Apply engine oil to the threaded portion of the
nuts marked with “A” and the bolts with “B”
shown in the illustration left, and then tighten
them to the specified torque.
Adjust the valve clearance.
Above works refer to “SERVICING” VALVE
CLEARANCE ADJUSTMENT” previously section
in this manual.
2. Cylinder Head Cover Gasket
Install the gasket to the cylinder head cover.
3. Cylinder Head Cover
1) Install the cylinder head cover.
2) Tighten the cylinder head cover nuts and bolts
to the specified torque in the numerical order
shown in the illustration.
Tighten:
Cylinder head cover nut and bolt to 18 N
⋅m (1.8 kg⋅m/13
lb
⋅ft)
N6A0466E
N6A0467E
Valve Clearance
mm (in)
At cold
0.4 (0.016)
N6A0114E
ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T) 6A3-47
4. Nozzle Cover
• Connect the battery ground cable.
• Lower the cab.
• Start the engine and check for the oil leakage
carefully.
Legend
1. Mounting rubber
2. Nut
3. Bolt
4. Stud
5. Gasket
6. Head cover
N6A0383E
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