Isuzu N-Series. 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