Isuzu N-Series. Service manual - part 596

6A1-72 4JB1/4JB1-TC/4JG2/4JH1-TC - ENGINE

CRANKSHAFT FRONT OIL SEAL (Belt Drive Type)

Component

Removal

Preparation

• Disconnect battery ground cable.
• Drain coolant.

1. Cooling Fan Assembly
2. Fan Shroud
3. Power Steering Pump Drive Belt (P/S Model)
4. A/C Compressor Drive Belt (A/C Model)
5. AC Generator Drive Belt
6. Power Steering Pump Bracket Assembly (P/S

Model)

7. Crankshaft Damper Pulley
8. Timing Pulley Upper Cover
9. Timing Pulley Lower Cover

10. Flange; Camshaft Pulley
11. Timing Belt

Above works refer to “TIMING BELT (Belt Type)”
Section in this manual.

12. Crankshaft Pulley Center

• Remove the pulley center by using special tool.

Remover: 5-8840-0161-0

13. Crankshaft Timing Pulley
14. Front Oil Seal

• Remove the oil seal by using special tool.
• With the oil seal pushed in deep, install the special

tool as shown in the illustration to remove the oil
seal.
Front oil seal remover: 5-8840-2362-0

Legend

1. Cooling fan assembly

8. Timing pulley upper cover

2. Fan shroud

9. Timing pulley lower cover

3. Power steering pump drive

10. Flange; Camshaft pulley

4. A/C compressor drive belt

11. Timing belt

5. AC Generator drive belt

12. Crankshaft pulley center

6. Power steering pump bracket assembly

13. Crankshaft timing pulley

7. Crankshaft damper pulley

14. Front oil seal

N6A3327E

4JB1/4JB1-TC/4JG2/4JH1-TC - ENGINE 6A1-73

Notice:
Take care not to damage sealing surface of front plate
and crankshaft when removing oil seal.

Installation

1. Front Oil Seal

• Install the oil seal by using special tool.

Installer: Front oil seal: 5-8840-2361-0
1) With the sleeve attached to the oil seal, put it in

the front end of the crankshaft.

2) With the edge portion of the oil seal attached

securely to the crankshaft, tighten it with the
center bolt until the sleeve hits securely against
the reference plane at the front end of the
crankshaft.

3) Remove the sleeve.
4) After pressing in the seal, check the measure-

ment of the oil seal.

Notice:

• Install the oil seal after assembling the timing pul-

ley housing.

• The lip portion of the oil seal is applied with oil.

• Take note of the press-in direction of the oil seal.

2. Crankshaft Timing Pulley
3. Crankshaft Pulley Center

• Install the timing pulley center and tighten bolt to

the specified torque.

Tighten:

• Pulley center bolt to 206 N

⋅m (21 kg⋅m / 152 lb⋅ft)

4. Timing Belt
5. Flange; Camshaft Pulley
6. Timing Pulley Lower Cover
7. Timing Pulley Upper Cover
8. Crankshaft Damper Pulley
9. Power Steering Pump Bracket Assembly (P/S

Model)

Standard

mm (in)

0.6 — 1.2 (0.024 — 0.047)

N6A3128E

N6A3148E

N6A3330E

6A1-74 4JB1/4JB1-TC/4JG2/4JH1-TC - ENGINE

10. AC Generator Drive Belt
11. A/C Compressor Drive Belt (A/C Model)
12. Power Steering Pump Drive Belt (P/S pump Model)
13. Fan Shroud
14. Cooling Fan Assembly

Above works refer to “TIMING BELT (Belt Type)”
Section in this manual.

4JB1/4JB1-TC/4JG2/4JH1-TC - ENGINE 6A1-75

CRANKSHAFT REAR OIL SEAL (Gear & Belt Drive Type)

Component

Removal

Preparation

• Disconnect battery ground cable

1. Transmission and Clutch Assembly

• Raise vehicle and support with suitable safely.

1) Transmission

• Reference mark (1) the flange yoke to the park-

ing brake drum.

• Disconnect the propeller shaft at flange yoke.
• Put aside the propeller shaft and tie it to the frame

so that it does not interface with servicing work.

2) Parking Brake Cable

• Move the joint cover.
• Disconnect the joint bolt.
• Remove the clip then disconnect the cable from

the bracket.

3) Wiring Connector

• Disconnect the wiring connectors from the car

speed sensor, the neutral switch and the back-
up light switch.

Legend

1. Transmission and clutch assembly

3. Rear oil seal

2. Flywheel

N6A3331E

N6A3332E

N6A3333E