Isuzu N-Series. Service manual — part 350
6A3-52 ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T)
Engine Left Side
Legend
1. Intake air duct
7. Water bypass hose
2. Vacuum hose
8. PCV hose
3. Nozzle cover
9. Injection pipe
4. Leak off pipe
10. Engine harness
5. Fuel pipe
11. Oil level gauge guide tube
6. Fuel filter and bracket
N6A0477E
ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T) 6A3-53
Cylinder Head Side
Removal
Preparation
• Disconnect battery ground cable
• Tilt the cab.
• Drain coolant
Engine Right Side
1. Front Exhaust Pipe
2. Air Conditioning (A/C) Compressor Drive Belt (If
equipped with A/C)
3. A/C Compressor (If equipped with A/C)
1) Disconnect magnetic clutch harness connec-
tor.
2) Dismount the compressor together with the
hoses from the A/C compressor bracket, and
fasten it with a wire to the appropriate location.
Legend
1. Radiator upper hose
8. Valve cap
2. Coolant reserve tank hose/bypass hose
9. Camshaft bearing cap
3. Cylinder head cover
10. Camshaft bearing upper
4. Cylinder head cover gasket
11. Camshaft assembly
5. Glow plug connector
12. Camshaft bearing lower
6. Injection nozzle holder assembly
13. Cylinder head assembly
7. Rocker arm shaft assembly
14. Cylinder head gasket
N6A0482E
6A3-54 ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T)
Engine Left Side
1. Intake Air Duct
1) Remove the clips at the connections with the in-
let cover and with the air cleaner.
2) Remove the intake air duct with the connecting
hoses attached.
2. Vacuum Hose
3. Nozzle Cover
4. Leak Off Pipe
5. Fuel Pipe
6. Fuel filter & Bracket
7. Water Bypass Hose
8. Positive Crankcase Ventilation (PCV) Hose
9. Injection Pipe
1) Loosen the injection pipe sleeve nuts (1).
Do not apply excessive force to the injection
pipes (5).
2) Loosen the injection pipes clips (3).
3) Remove the injection pipe assembly.
Plug the delivery valve holder (2) ports and
nozzle holder (4) ports with caps to prevent the
entry of foreign material.
10. Engine Harness
Disconnect thermometer unit, thermo switch, ta-
chometer sensor and glow plug harness connec-
tors an separate harness from clips.
11. Oil Level Gauge Guide Tube
Remove the guide tube fixing bolt and pull out the
guide tube.
Legend
1. Fuel filter
2. Leak off
N6A0386E
Legend
1. Engine harness
N6A0388E
N6A0389E
ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T) 6A3-55
Cylinder Head Side
1. Radiator Upper Hose
2. Coolant Reserve Tank Hose/Bypass Hose
3. Cylinder Head Cover
4. Cylinder Head Cover Gasket
5. Glow Plug Connector
6. Injection Nozzle Holder Assembly
Mark the nozzle holder assemblies fitting positions
by tagging each nozzle holder assembly with the
cylinder number from which it was removed.
7. Rocker Arm Shaft Assembly
8. Valve Cap
9. Camshaft Bearing Cap
10. Camshaft Bearing Upper
11. Camshaft Assembly
12. Camshaft Bearing Lower
Above works refer to “ROCKER ARM SHAFT AS-
SEMBLY AND CAMSHAFT ASSEMBLY” section
in this manual.
13. Cylinder Head Assembly
Loosen the cylinder head bolts in numerical order
a little at a time.
Caution:
Failure to loosen the cylinder head bolts in numerical or-
der a little at a time will adversely affect the cylinder
head lower surface.
14. Cylinder Head Gasket
Caution:
Do not reuse the cylinder head gasket.
Installation
Cylinder Head Side
1. Cylinder Head Gasket
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 ahold 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 cylinder head gasket thickness is im-
portant.
Installing the wrong thickness gasket can result
in greatly reduced engine performance.
4) There are three cylinder head gaskets avail-
able.
Piston Head Projection Measurement
• Select a cylinder head gasket.
• Clean thoroughly the top faces of the piston head
and the cylinder body.
Legend
1. Glow plug connector
2. Injection nozzle holder assembly
N6A0390E
N6A0483
N6A0484E
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