Isuzu engine 4j series. Manual - part 51

6A1 – 72  4JB1/4JB1T/4JB1TC/4JG2 - ENGINE

6. Front Oil Seal

•

Use a plastic hammer and a screwdriver to top around
the oil seal to free it from the gear case cover.
Take care not to damage the oil seal fitting surfaces.

INSTALLATION

6. Front Oil Seal

•

Use the installer to install the front oil seal 

!

 to the

gear case cover 

"

.

Oil Seal Installer: 5-8840-2061-0
Note the oil seal installation depth 

#

 shown in the

illustration.
Depth 

#

 = 1 mm (0.039 in.)

5. Crankshaft Damper Pulley

Tighten the crankshaft damper pulley bolt to the specified
torque.

NOTE:

Hold the flywheel ring gear stationary to prevent the
crankshaft from turning when tightening the damper
pulley.
Pulley Boss Bolt Torque

N∙m (kg∙m/lb∙ft)

                                                                                                                   

206 (21/152)

                                                                                                                   

4. Cooling Fan Assembly

•

Mount fan pulley, distance piece, and cooling fan asm
(in this order) on the water pump, and tighten to the
specified torque.

N∙m (kg∙m/lb∙in)

                                                                                                                   

8 (0.8/69)

                                                                                                                   

3. AC Generator Drive Belt

•

Install AC Generator drive belt and adjust belt tension.

•

Refer to Drive Belt Adjustment in this section.

2. Power Steering Pump Drive Belt

•

Install power steering pump drive belt and adjust belt
tension.

•

Refer to “Drive Belt Adjustment” in this section.

1. Fan Shroud

•

Install the fan shroud and reservoir tank hose.

•

Pour coolant

•

Start the engine and check coolant leakage.

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4JB1/4JB1T/4JB1TC/4JG2 – ENGINE  6A1 – 73

CRANKSHAFT FRONT OIL SEAL (Belt Drive Type)

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.

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6A1 – 74  4JB1/4JB1T/4JB1TC/4JG2 - ENGINE

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

NOTE:

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

INSTALLATION

14. 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 measurement of

the oil seal.

Standard

mm (in)

                                                                                                                   

0.6 - 1.2 (0.024 - 0.047)

                                                                                                                   

NOTE:

•

Install the oil seal after assembling the timing
pulley housing.

•

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

•

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

13. Crankshaft Timing Pulley

12. Crankshaft Pulley Center

•

Install the timing pulley center and tighten bolt to the
specified torque.

Pulley Center Bolt Torque

N∙m (kg∙m/lb∙ft)

                                                                                                                   

206 (21/152)

                                                                                                                   

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4JB1/4JB1T/4JB1TC/4JG2 – ENGINE  6A1 – 75

11. Timing Belt

10. Flange; Camshaft Pulley

9. Timing Pulley Lower Cover

8. Timing Pulley Upper Cover

7. Crankshaft Damper Pulley

6. Power Steering Pump Bracket Assembly (P/S Model)

5. AC Generator Drive Belt

4. A/C Compressor Drive Belt (A/C Model)

3. Power Steering Pump Drive Belt (P/S pump Model)

2. Fan Shroud

1. Cooling Fan Assembly

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