Isuzu N-Series. Manual - part 619

6C-46 ENGINE FUEL

Installation

1. Injection Pump Assembly

• Put the timing pulley housing side and injection

pump side setting marks together, and temporarily
tighten.

• After adjusting injection timing retighten.
• Mount rear bracket on cylinder block and tighten to

the specified torque.

Tighten:
Rear bracket on cylinder block to 19 N

⋅m (1.9 kg⋅m/14

lb

⋅ft)

• Install adjust lock bolt and lightly tighten.
• After adjusting injection timing, retighten.

2. Injection Pipe

• Connect the pump side and nozzle side of the pipe,

and tighten securely.

• Install clip where it was.

Tighten:
Sleeve Nut to 29 N

⋅m (3.0 kg⋅m/22 lb⋅ft)

3. Injection Pump Harness

• Mount engine harness and connect it to switches.

4. CSD Water Hose

• Connect the water hose and tighten clip securely.

5. Fuel Hose

• Connect the fuel feed hose and fuel return hose.
• Connect the rear off hose.

6. Injection Pump Control Cable

1) Install the Control wire to the engine control le-

ver.

2) Hold the accelerator lever (1) in the fully closed

position and stretch the control cable (2) in the
direction indicated by the arrow to remove any
slack.

3) Tighten the accelerator cable bracket bolt.

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ENGINE FUEL 6C-47

7. Air Intake Duct

• Connect the air intake duct and tighten clip secure-

ly.

8. Injection Pump Timing Pulley

• Align the timing pulley with the pump shaft key.
• Install the stopper bolt to the timing pulley.

This will prevent the timing pulley from moving.

• Tighten the timing pulley nut to the specified

torque.

Tighten:
Injection pump timing pulley nut to 64 N

⋅m (6.5 kg⋅m/47

lb

⋅ft)

• Remove the stopper bolt from the injection timing

pulley.

9. Timing Belt

• When removing the belt, make sure the marks on

the bolt fixed camshaft, injection pulley and crank-
shaft timing pulley are set to each other.

Caution:

• Do not turn crankshaft because otherwise piston

and valve will interfere with each other.

Caution:

• For accurate mounting, be sure to mount the belt in

the direction that letters on the belt are readable.

• Mount new timing belt on pulleys in the following

steps.
Crankshaft timing pulley (1) 

→ Camshaft

Timing pulley (2) 

→ Idle pulley (3) → Injection

Pump pulley (4) 

→ Tensioner (5)

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Legend

1. Setting mark

Legend

1. Cylinder head side

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6C-48 ENGINE FUEL

• Set the belt on crankshaft timing pulley and hold

with one hand.

• Stretch and pass the belt round each pulley with

the other hand.

• After passing it round injection pump pulley, install

tensioner while taking care not to slacken the belt.

Caution:

• On completion of belt passing, make sure that the

setting mark on crankshaft timing pulley is set.

• If not set, reset the mark and repeat the belt pass-

ing.

• Remove tension adjust, lever mounting bolt, and

loosen the fulcrum bolt to such extent that the lever
is movable.

• Hung a spring balance from the end hole of tension

adjust lever, and with the balance pulled down with
88 N (9 Kg/20 lb), loosen once the tensioner
mounting bolt and then retighten it.

• Turn the crankshaft by 45

° counterclockwise to

shift belt slackness on the tensioner.

• Again hand the spring balance hanging from the

end hole of tension adjust lever and pull it down
with the specified force. Under this condition, loos-
en tensioner mounting bolt to absorb belt slack-
ness and retighten it to specified torque.

Legend

1. Lock bolt
2. Setting mark

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Legend

1. Tensioner

Legend

1. Tensioner

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ENGINE FUEL 6C-49

Tighten:
Bolt to 76 N

⋅m (7.8 kg⋅m/56 lb⋅ft)

• Fix the tension adjust lever.

Caution:

• In case where the timing belt has been replaced

with the actuation of warning light, put off the light
with change over switch on the reverse side of
meter.

• Refer to Cab and Chassis Electrical in Section 8.

• Tighten the tension adjusting lever nut and bolt.

10. Flange; Camshaft Pulley

• Install the timing pulley flange (1) to the camshaft

(2).

• Tighten the timing pulley flange bolts to the speci-

fied torque.

Tighten:
19 N

⋅m (1.9 kg⋅m/14 lb⋅ft)

11. Timing Pulley Lower Cover

• Install timing pulley lower cover and tighten bolt to

the specified torque.

Tighten:
Bolt to 8 N

⋅m (0.8 kg⋅m/69 lb⋅in)

12. Timing Pulley Upper Cover

• Install timing pulley upper cover and tighten bolt to

the specified torque.

Tighten:
Bolt to 8 N

⋅m (0.8 kg⋅m/69 lb⋅in)

13. Crankshaft Damper Pulley

• Install crankshaft damper pulley and tighten bolt to

the specified torque.

Tighten:
Bolt to 19 N

⋅m (1.9 kg⋅m/14 lb⋅ft)

14. Power Steering Pump & Bracket Assembly (P/S

Model)

• Install the pipe bracket, clip and tighten bolts to the

specified torque.

Tighten:
Pipe bracket bolts to 19 N

⋅m (1.9 kg⋅m/14 lb⋅ft)

Pipe clip bolts to 10 N

⋅m (1.0 kg⋅m/7 lb⋅ft)

Belt Tension

N (Kg/lb)

98 — 118 (10 — 12/22 — 26)

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