Isuzu N-Series. Service manual — part 557
SERVICE INFORMATION 00-43
A: Move the injection pump toward the engine.
B: Move the injection pump away from the engine.
Tighten the pump fixing nut, adjust bolt and pump
distributor head plug to the specified torque.
Tighten:
• Pump fixing bolt to 24 N
⋅m (2.4 kg⋅m / 17 lb⋅ft)
• Adjust bolt to 19 N
⋅m (1.9 kg⋅m / 14 lb⋅ft)
• Injection pump distributor head plug to 17 N
⋅m (1.7
kg
⋅m / 12 lb⋅ft)
Caution:
When installing the distributor head/plug, be sure to use
new copper washer.
Compression Pressure Measure-ment
1. Start the engine and allow it to idle until the coolant
temperature reaches 70 — 80
°C (158 — 176°F).
2. Remove the following parts.
• Glow plugs
• Fuel cut solenoid connector
• QOS (Quick-On Start System) fusible link wire at
the connector.
3. Set the adapter and compression gauge to the No.
1 cylinder glow plug hole.
Compression Gauge
(with Adapter): 5-8840-2008-0 (J-29762)
Adapter: 5-8531-7001-0
4. Turn the engine over with the starter motor and
take the compression gauge reading.
5. Repeat the procedure (Steps 3 and 4) for the re-
maining cylinders.
If the measured value is less than the specified lim-
it, refer to “Troubleshooting” in this Manual.
When large than
standard value
When smaller than
standard value
Gear drive
A
B
Legend
A. To advance
B. To retard
N6A3036E
Compression Pressure at 200 rpm kPa (kg/cm
2
/psi)
Standard
Limit
4JB1
3,038 (31/441)
2,157 (22/313)
4JG2
3,334 (34/484)
2,452 (25/356)
N6A3037E
N6A3038E
00-44 SERVICE INFORMATION
Quick-On Start II System (4JB1 / 4JB1-TC /
4JH1-TC only)
Quick-On Start System Inspection Procedure
1. Disconnect the thermo-sensor connection on the
thermostat outlet pipe.
2. Turn the starter switch to the “ON” position.
If the Quick-On Start II System is operating proper-
ly, the glow relay will make a clicking sound within
15 seconds after the starter switch is turned on.
3. Measure the glow plug terminal voltage with a cir-
cuit tester immediately after turning the starter
switch to the “ON” position.
Quick-ON Start III System (4JG2 only)
Quick-On Start System Inspection Procedure
1. Disconnect the thermo-sensor connection on the
thermostat outlet pipe.
2. Turn the starter switch to the “ON” position.
If the Quick-On Start III System is operating prop-
erly, the glow relay will make a clicking sound with-
in seven seconds after the starter switch is turned
on.
3. Measure the glow plug terminal voltage with a cir-
cuit tester immediately after turning the starter
switch to the “ON” position.
Notice:
Electrical power to the quick-on start system will be cut
after the starter has remained in the “ON” position for
twenty seconds.
Turn the starter switch to the “OFF” position and back to
the “ON” position.
This will reset the Quick-On Start III System.
Glow Plug Terminal Voltage
V
Approx. 11
N6A3039E
N6A3040E
Glow Plug Terminal Voltage
V
8 — 9
N6A3039E
SERVICE INFORMATION 00-45
N6A3725E
00-46 SERVICE INFORMATION
FIXING TORQUE
Cylinder Head Cover, Cylinder Head Rocker, Shaft Braker
N6A3042E
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