Isuzu N-Series. Service manual — part 492
Engine Mechanical (4HK1-TC) 6A-73
Legend
1. Bridge Cap
2. Bridge
7. Install the camshaft assembly.
Refer to “Camshaft Assembly”.
8. Install the rocker arm shaft assembly.
Refer to “Rocker Arm Shaft Assembly”.
9. Install the cylinder head cover.
Refer to “Cylinder Head Cover”.
Special Tool
Illustration
Tool Number /
Description / Remarks
5-8840-2621-0 (J-43263)
Valve Spring Replacer
5-8840-2808-0
(EN-46721)
Pivot Assembly
N6A6093E
5-8840-2833-0
(EN-47685)
Valve Stem Seal Installer
Illustration
Tool Number /
Description / Remarks
EN47685
6A-74 Engine Mechanical (4HK1-TC)
Cylinder Head
Component
Legend
1. Bridge Cap
2. Bridge
3. Bridge Guide
4. Split Collar
5. Spring Upper Sheet
6. Valve Spring
7. Valve Stem Oil Seal
8. Valve Guide
9. Idle Gear C Cover
10. Idle Gear C
11. Glow Plug
12. Intake and Exhaust Valves
13. Cylinder Head
14. A/C Compressor Bracket
15. Thermostat
16. Water Outlet Pipe
Caution:
To avoid electric shock;
Set the switch to the ‘OFF’ position and disconnect
battery negative cable before checking or repairing the
fuel injector, wiring or/and connectors.
Removal
1. Drain the coolant.
2. Remove the engine harness.
3. Remove the front exhaust pipe.
4. Remove the turbocharger.
Refer to “Turbocharger and Exhaust Manifold”.
N6A6120E
Engine Mechanical (4HK1-TC) 6A-75
5. Remove the left-hand EGR adapter and right-hand
EGR pipe.
6. Remove the EGR water feed pipe.
7. Remove the EGR water return pipe.
8. Remove the EGR cooler.
9. Remove the water feed pipe for coolant water for
the EGR cooler and the water return pipe.
Legend
1. EGR Adapter
2. Water Return Pipe
3. EGR Cooler
4. EGR Pipe
5. Water Feed Pipe
10. Remove the fan guide bracket.
11. Remove the left-hand intake pipe between the
inter-cooler and the inlet duct.
12. Remove the A/C compressor drive belt.
• Loosen the tension pulley nut and the adjust
bolt and remove the drive belt.
Legend
1. Tension Pulley Nut
2. Adjust Bolt
13. Remove the A/C compressor.
• Remove the A/C compressor harness
connector, remove the compressor from the
A/C compressor bracket, and fix it with wires
and others.
14. Remove the cylinder head cover.
Refer to “Cylinder Head Cover.”
15. Remove radiator upper hose.
16. Loosen the fuel injector terminal nuts alternately to
the same level, and remove the terminal.
17. Loosen the fuel injector harness bracket bolt,
remove the inside connector, and remove the
harness bracket.
N6A6025E
N6A6121E
N6A6122E
N6A6123E
6A-76 Engine Mechanical (4HK1-TC)
18. Remove the nozzle leak-off pipe (4).
Legend
1. Harness Bracket
2. Harness Connector
3. Fuel Injector Terminal Nut
4. Nozzle Leak-off Pipe
19. Remove the fuel leak-off hose.
20. Remove the fuel leak-off pipe (2).
Legend
1. High Pressure Pipe
2. Leak-off Pipe
21. Remove the water bypass hose from the cylinder
head side.
• Remove the engine coolant temperature sensor
connector.
22. Remove the EGR valve and EGR valve connector.
23. Remove the camshaft position sensor connector.
24. Remove the rocker arm shaft assembly.
Refer to “Rocker Arm Shaft Assembly”.
25. Remove the camshaft assembly.
Refer to “Camshaft Assembly”.
26. Remove the bridge cap carefully so that it does not
fall into inside the engine.
27. Remove the bridge.
Caution:
Store the removed bridge and bridge cap so that they
can be placed in their original locations.
28. Remove the glow plug connector.
29. Remove the glow plug.
N6A6124E
N6A6125E
N6A6126E
N6A6127E
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