Isuzu N-Series. Manual — part 349
6A3-48 ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T)
CAMSHAFT 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
Above works refer to “ROCKER ARM SHAFT AS-
SEMBLY” section in this manual.
5. Valve Cap
6. Camshaft Bearing Cap
7. Camshaft Bearing Upper
8. Camshaft Assembly
9. Camshaft Bearing Lower
Legend
1. Nozzle cover
6. Camshaft bearing cap
2. Cylinder head cover
7. Camshaft bearing upper
3. Cylinder head cover gasket
8. Camshaft assembly
4. Rocker arm shaft assembly
9. Camshaft bearing lower
5. Valve cap
N6A0470E
ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T) 6A3-49
• If the camshaft bearings are to be reinstalled,
mark their fitting positions by tagging each
bearing with the cylinder number from which it
was removed.
Installation
1. Camshaft Bearing Lower
2. Camshaft Assembly
1) Turn the crankshaft in the direction of normal
rotation until the timing mark on the crankshaft
damper pulley is aligned with the TDC notched
line.
2) Apply engine oil to the camshaft journal and the
camshaft bearing surfaces before installation.
3) Carefully align the camshaft gear “I” mark and
the cylinder head upper face shown in the illus-
tration.
3. Camshaft Bearing Upper
4. Camshaft Bearing Cap
• Install the bearing caps with the bearing cap
head mark (arrow) facing forward.
• Apply a coat of engine oil to the bearing cap
bolt and stud threads.
• Tighten the bearing cap bolts and studs to the
specified torque.
Tighten:
Camshaft bearing cap nut and bolt to 27 N
⋅m (2.8 kg⋅m/
20 lb
⋅ft)
Legend
1. Camshaft bearing cap
2. Camshaft bearing upper
3. Camshaft assembly
4. Camshaft bearing lower
N6A0471E
N6A0472E
N6A0109E
6A3-50 ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T)
5. Valve Cap
Apply engine oil to the inside of the valve caps and
install them to the valve stem end.
Caution:
Take sufficient care not to let the valve caps fall into the
gear.
6. Rocker Arm Shaft Assembly
Above works refer to “ROCKER ARM SHAFT AS-
SEMBLY” section in this manual.
7. Cylinder Head Cover Gasket
8. Cylinder Head Cover
Above works refer to “CYLINDER HEAD COVER”
section in this manual.
9. Nozzle Cover
• Connect the battery ground cable.
• Lower the cab.
• Start engine and check for oil leakage carefully.
N6A0474E
N6A0475E
ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T) 6A3-51
CYLINDER HEAD
Component
Engine Right Side
Legend
1. Front exhaust pipe
3. A/C compressor (If equipped with A/C)
2. A/C compressor drive belt (If equipped with A/C)
N6A0476E
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