Isuzu N-Series. Service manual — part 585
6A1-28 4JB1/4JB1-TC/4JG2/4JH1-TC - ENGINE
7. Timing Gear Case Cover
1) Align the gear case with the timing gear case
knock pin and then install the timing gear case
cover.
2) Tighten the gear case cover bolts to the speci-
fied torque.
8. Noise Cover Spacer
9. Noise Shield Cover
10. Crankshaft Damper Pulley
Tighten the crankshaft damper pulley bolt to the
specified torque.
Notice:
Hold the flywheel ring gear stationary to prevent the
crankshaft from turning when tightening the damper pul-
ley.
Tighten:
• Pulley boss bolt to 206 N
⋅m (21 kg⋅m / 152 lb⋅ft)
11. 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:
• 8 N
⋅m (0.8 kg⋅m / 69 lb⋅in)
12. AC Generator Drive Belt
• Install AC Generator drive belt and adjust belt ten-
sion.
• 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)
13. Power Steering Pump Drive Belt (P/S Model)
• Install Power Steering pump drive belt and adjust
belt tension.
• 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:
• 27 N
⋅m (2.8 kg⋅m / 20 lb⋅ft)
14. Fan shroud
• Install the fan shroud and reservoir tank hose.
• Pour coolant
• Start the engine and check coolant leakage.
N6A3169E
N6A3170E
Drive Belt Deflection
mm (in)
8 (0.31) — 12 (0.47)
Drive Belt Deflection
mm (in)
8 (0.31) — 12 (0.47)
4JB1/4JB1-TC/4JG2/4JH1-TC - ENGINE 6A1-29
IDLE GEAR “B” (4JH1-TC SCISSOR GEAR)
Component
Reassembly
1. Drive pins into the main gear, the front gear, and
the rear gear.
2. Apply pressure to the main gear bearing from the
front side of the main gear (the side with the
groove).
3. Place the special tool in a vise so that the main
gear is pushed up toward the rear side.
Scissor gear setting tool
Base: 5-86739-149-0
Legend
1. Snap ring
6. Spring
2. Rear gear
7. Front gear
3. Spring
8. Snap ring
4. Main gear
9. Lock bolt
5. Bearing
N6A3275E
N6A3276E
N6A3277E
6A1-30 4JB1/4JB1-TC/4JG2/4JH1-TC - ENGINE
4. Set the spring as shown in the illustration.
5. Position the rear gear so that it pin is aligned with
the receiving end of the spring.
6. Install the snap ring to the main gear groove.
7. Set the rear gear setting hole to the pin of the spe-
cial tool.
N6A3278E
N6A3279E
N6A3280E
N6A3281E
4JB1/4JB1-TC/4JG2/4JH1-TC - ENGINE 6A1-31
8. Place the special tool in a vise so that the main
gear is pushed up toward the front side.
9. Repeat Steps 3, 4, and 5.
10. Use the special tool to mesh the teeth of the front
gear, the main gear, and the rear gear.
11. Insert a lock bolt (M6
× 1.00 L = 30) (1) into the
scissor gear fixing hole to prevent the scissor gear
from turning.
Scissor gear setting tool
Lever: 5-86739-150-0
N6A3282E
N6A3283E
N6A3284E
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