Isuzu N-Series. Manual — part 620
6C-50 ENGINE FUEL
• Install the Power Steering pump & bracket assem-
bly.
Tighten:
• 10M bolts to 40 N
⋅m (4.1 kg⋅m/30 lb⋅ft)
• 8M bolts to 19 N
⋅m (1.9 kg⋅m/14 lb⋅ft)
• Lock nut to 27 N
⋅m (2.8 kg⋅m/20 lb⋅ft)
15. AC Generator Drive Belt
• Install AC generator drive belt and adjust belt ten-
sion.
• Depress the drive belt mid-portion with a 98N (10
kg/ 22 lb) force.
• Install fixing bolt and tighten bolts to the specified
torque.
Tighten:
• Generator fixing bolt to 40 N
⋅m (4.1 kg⋅m/30 lb⋅ft)
• Adjust Plate Fixing Bolt to 19 N
⋅m (1.9 kg⋅m/14 lb⋅ft)
16. A/C Compressor Drive Belt (A/C Model)
• Install A/C compressor drive belt and adjust belt
tension.
• Depress the drive belt mid-portion with a 98N (10
kg/22lb) force.
• Tighten the Idler lock nut to the specified torque.
Tighten:
Idler lock nut to 27 N
⋅m (2.8 kg⋅m/ 20 lb⋅ft)
4JG2
4JB1
17. Power Steering Pump Drive Belt (P/S Model)
• Install power steering pump drive belt and adjust
belt tension.
Legend
1. Pipe bracket
2. Lock nut
3. Clip
Drive Belt Deflection
mm (in)
8 (0.31) — 12 (0.47)
Drive Belt Deflection
mm (in)
8 (0.31) — 12 (0.47)
N6A3793E
Legend
1. A/C compressor drive belt
2. P/S oil pump drive belt
3. AC generator fan pulley drive belt
Legend
1. A/C compressor drive belt & P/S pump drive
belt
2. AC generator & fan pulley drive belt
N6A3297E
N6A3295E
ENGINE FUEL 6C-51
• Depress the drive belt mid-portion with a 98 N (10
kg/22 lb) force.
• Tighten the idler lock nut to the specified torque.
Tighten:
Idler lock nut to 27 N
⋅m (2.8 kg⋅m/ 20 lb⋅ft)
18. Fan Shroud
• Install the fan shroud and reservoir tank hose.
?
19. Cooling Fan Assembly
• Mount fan pulley, distance piece, and cooling fan
assembly (in this order) on the water pump, and
tighten to the specified torque.
Tighten:
Nut to 8 N
⋅m (0.8 kg⋅m/69 lb⋅in)
• Connect battery ground cable.
• Pour coolant.
• Start the engine and check coolant leakage.
Injection Timing Adjustment
• Set No. 1 cylinder to top dead center.
• Remove injection pump distributor head plug.
• Cancel wax CSD with the handle of a screw driver.
• Fit a dial gauge and set lift to 2 mm.
Measuring device: 5-8840-0145-0
• Set crankshaft damper pulley top dead center mark
about 45
° before top dead center from the pointer.
• Set dial gauge in the “0” position.
• Turn the crankshaft a little clockwise and counter-
clockwise and see if the pointer is stable in the “0”
position.
• Turn the crankshaft in the normal direction and
read the measuring device’s indication at as fol-
lows.
Drive Belt Deflection
mm (in)
8 (0.31) — 12 (0.47)
N6A3223E
N6A3456E
N6A3457E
6C-52 ENGINE FUEL
• If it reads abnormal, loosen injection pump fixing
nut and pump bracket adjust bolt, make adjustment
by changing the pump mounting angle, and tighten
the nut and bolt to the specified torque where the
dial indicates the specified valve.
Tighten:
• Pump fixing nut to 24 N
⋅m (2.4 kg⋅m/17 lb⋅ft)
• Adjust bolt to 19 N
⋅m (1.9 kg⋅m/14 lb⋅ft)
• Remove the measuring device and tighten the dis-
tributor head plug to the specified torque.
Tighten:
17 N
⋅m (1.7 kg⋅m/12 lb⋅ft)
Caution:
• When installing the distributor head plug, be sure
to use new copper washer.
• Connect injection pipe.
• Fit pipe clip where specified.
Adjustment of Idling Speed
1. Pull the parking brake and lock the wheels.
2. Set the transmission gear to the neutral position.
3. Start the engine and idle it until the water tempera-
ture gets to 70 to 80
°C (158 to176°F).
4. Turn back the idling control button, and remove the
control cable from the control lever (injection
pump).
5. Set the engine tachometer.
6. Check the idling rotation.
When the idling rotation is outside the range of the
specified value, adjust it correctly.
1) Loosen the lock nut of the idling set bolt.
2) Rotate the idling set bolt to set the idling rota-
tion to the specified value.
4JB1
BTDC 14
°, BTDC 12° (′91/ 542A)
4JB1-TC
BTDC4
°
4JG2 (Belt Drive
Type)
ATDC 1
° (′91/ 542A)
TDC 0
° (′91/ 542B)
4JG2 (Gear
Drive Type)
ATDC 2 (
′91/ 542A)
Legend
A. 4JB1
B. 4JG2 Gear drive type
C. 4JG2 Belt drive type
Measuring Device’s Indication
mm (in)
Standard
0.5 (0.0197)
N6A3458E
Specified value (rpm) =
750 — 790 (4JB1)
700 — 740 (4JG2)
675 — 725 (4JH1-TC)
N6A3459E
N6A3460E
ENGINE FUEL 6C-53
3) Tighten the lock nut to lock the set bolt.
4) Check the tension of the control cable, and re-
move any slackening as required.
N6A3368E
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