Isuzu N-Series. Service manual — part 347
6A3-40 ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T)
VALVE GUIDE SEAL & VALVE SPRING
Component
Removal
Preparation
• Disconnect battery ground cable.
• Tilt the cab.
1. Nozzle Cover
2. Leak Off Pipe
3. Injection Pipe
• Loosen the injection pipe sleeve nuts (1).
Legend
1. Nozzle cover
10. Valve cap
2. Leak off pipe
11. Camshaft bearing cap
3. Injection pipe
12. Camshaft bearing upper
4. Glow plug connector
13. Camshaft assembly
5. Glow plug
14. Camshaft bearing lower
6. Injection nozzle holder assembly
15. Cotter collar
7. Cylinder head cover
16. Spring upper seat
8. Cylinder head cover gasket
17. Valve spring
9. Rocker arm shaft assembly
18. Valve guide seal
N6A0452E
ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T) 6A3-41
Do not apply excessive force to the injection
pipes (5).
• Loosen the injection pipes clips (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.
4. Glow Plug Connector
5. Glow Plug
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. Cylinder Head Cover
8. Cylinder Head Cover Gasket
9. Rocker Arm Shaft Assembly
Above works refer to “ROCKER ARM SHAFT AS-
SEMBLY” section in this manual.
10. Valve Cap
11. Camshaft Bearing Cap
12. Camshaft Bearing Upper
13. Camshaft Assembly
14. Camshaft Bearing Lower
• 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.
15. Cotter Collar
16. Spring Upper Seat
17. Valve Spring
• Apply compressed air to cylinder from the glow
plug hole to hold the valve in place.
• Using special tool, compress valve spring and
remove cotter collar.
Valve Spring Compressor: 5-8840-2228-0
Legend
1. Glow plug connector
2. Glow plug
3. Injection nozzle holder assembly
N6A0453E
N6A0454E
Legend
1. Camshaft bearing cap
2. Camshaft bearing upper
3. Camshaft assembly
4. Camshaft bearing lower
N6A0421E
6A3-42 ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T)
18. Valve Guide Seal
Installation
1. Valve Guide Seal
• Apply a coat of engine oil to the valve guide
seal inner face.
• Use a valve guide seal installer to install the
valve guide seal to the valve guide
Valve Guide Seal Installer: 8-9439-6815-0
2. Valve Spring
Install the valve spring with its fine pitched (or
painted) end side down.
3. Spring Upper Seat
4. Cotter Collar
1) Use the valve spring compressor to push the
valve spring into position.
Valve Spring Compressor: 5-8840-2228-0
2) Install the cotter collar to the valve stem.
3) Set the cotter collar by tapping around the head
of the collar with a rubber hammer.
Legend
1. Cotter collar
2. Spring upper seat
3. Valve spring
Legend
1. Oil seal
N6A0456E
N6A0457E
N6A0458E
N6A0140E
ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T) 6A3-43
5. Camshaft Bearing Lower
6. Camshaft Assembly
7. Camshaft Bearing Upper
8. Camshaft Bearing Cap
9. Valve Cap
Above works refer to “CAMSHAFT ASSEMBLY”
section in this manual.
10. Rocker Arm shaft Assembly
Above works refer to “ROCKER ARM SHAFT AS-
SEMBLY” section in this manual.
11. Cylinder Head Cover Gasket
12. Cylinder Head Cover
Above works refer to “CYLINDER HEAD COVER”
section in this manual.
13. Injection Nozzle Holder Assembly
Tighten the nozzle holder flange nuts to the speci-
fied torque in the numerical order shown in the il-
lustration.
Tighten:
Nozzle holder flange nut to 19 N
⋅m (1.9 kg⋅m/14 lb⋅ft)
14. Glow Plug
Tighten:
Glow plug to 23 N
⋅m (2.3 kg⋅m/17 lb⋅ft)
15. Glow Plug Connector
16. Injection Pipe
17. Leak Off Pipe
Above works refer to “INJECTION PUMP ASSEM-
BLY” section in this manual.
Legend
1. Cotter collar
2. Spring upper seat
N6A0460E
N6A0115E
N6A0462E
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