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Isuzu engine 4j series. Manual - part 25

6A – 36

GENERAL ENGINE MECHANICAL

Main Bearing

Bore Diameter mm (in.)

Crankshaft

Main Journal Diameter mm (in.)

Size Mark

Inside Diameter

Size Mark

Outside Diameter

Crankshaft

Bearing

Size Mark

Oil Clearance

mm (in.)

1 or -

69.927~69.942

(2.7530~2.7536)

Black

0.035~0.061

(0.0014~0.0024)

2 or -

69.922~69.927

(2.7528~2.7530)

0.032~0.058

(0.0013~0.0023)

73.987~74.000

(2.9129~2.9134)

3 or -

69.917~69.922

(2.7526~2.7528)

Blue

0.037~0.063

(0.0015~0.0025)

1 or -

69.927~69.942

(2.7530~2.7536)

0.031~0.056

(0.0012~0.0022)

2 or -

69.922~69.927

(2.7528~2.7530)

Green

0.036~0.048

(0.0014~0.0019)

73.975~73.987

(2.9124~2.9129)

3 or -

69.917~69.922

(2.7526~2.7528)

Black

0.033~0.058

(0.0013~0.0023)

REASSEMBLY

13. Crankshaft

•

Install the main bearings to the cylinder body and the
main bearing caps.

•

Be sure that they are positioned correctly.

•

Apply new engine oil to the upper and lower main
bearing faces.

•

Carefully mount the crankshaft.

•

Apply engine oil to the thrust washer.

•

Assemble the thrust washer to the No.3 bearing
journal. The oil grooves must face the crankshaft.

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GENERAL ENGINE MECHANICAL 6A – 37

12. Main Bearing Cap

•

Apply the recommended liquid gasket or its equivalent
to the No. 5 crankshaft bearing cap

as shown in the

illustration.

•

Install the arch gasket

to the No. 5 bearing cap.

Use your fingers to push the arch gasket into the
bearing cap groove.

NOTE:

Be sure that the bearing cap fitting surface is
completely free of oil before applying the liquid
gasket.

Do not allow the liquid gasket to obstruct the cylinder
thread holes and bearings.

•

Install the bearing caps with the bearing cap head
arrow mark facing the front of the engine.

•

Apply engine oil to the crankshaft bearing cap bolts.

•

Tighten the crankshaft bearing cap bolts to the
specified torque a little at a time in the sequence
shown in the illustration.

N∙m (kg∙m/lb∙ft)

167 (17.0/123)

NOTE:
Check to see that the crankshaft turns smoothly by
rotating it manually.

6A-37-1.tif

6A-37-2.tif

6A-37-3.tif

6A – 38

GENERAL ENGINE MECHANICAL

11. Crankshaft Rear Oil Seal (Gear and Belt Drive Model)

Use the oil seal installer to install the oil seal to the cylinder
body.
Installer: Rear Oil Seal 5-8840-2359-0

NOTES:

Wipe off rust and scraps clean from the press-in
portion of the oil seal.

Take note of the press-in direction of the oil seal.
1) Install the adapter of the special tool to the rear end of

the crankshaft with two bolts.

2) Install the oil seal to the outer circumference of the

adapter.

3) Insert the slave into the adapter portion, and tighten it

in with the bolt (M12 x 1.75L=70) until the adapter
section hits the slave.

4) Remove the adapter and the slave.
5) After installing the oil seal, check the measurement of

the oil seal.

Standard

mm (in)

12.2 - 12.8 (0.48 - 0.50)

10. Cylinder Block Rear Plate

Align the rear plate with the cylinder body knock pins.
Tighten the rear plate to the specified torque

N∙m (kg∙m/lb∙ft)

82 (8.4/61)

9. Flywheel

1) Thoroughly clean the remove the oil from the threads

of crankshaft.

2) Mount the flywheel on the crankshaft and then install

the washer.

3) Apply a coat of engine oil to the threads of the flywheel

bolts.

4) Align the flywheel with the crankshaft dowel pin.
5) Tighten the flywheel bolts to the specified torque in two

steps using the Angular Tightening Method.
Follow the numerical order shown in the illustration.

Flywheel Bolt Torque

N∙m (kg∙m/lb∙ft)

1st Step

2nd Step

59 (6.0/43)

60° - 90°

8. Piston and Connecting Rod

7. Piston Cooling Oil Pipe

6A-38-1.tif

6A-38-2.tif

GENERAL ENGINE MECHANICAL 6A – 39

6. Oil Pump Assembly

Above works refer to “PISTON AND CONNECTING ROD”
Section in this manual.

5a. Timing Pulley Housing

1) Install the timing pulley housing to the cylinder body.

NOTE:

Take care not to twist the front oil seal.
2) Tighten the timing pulley housing bolt together with the

timing pulley housing gasket to the specified torque.

N∙m (kg∙m/lb∙ft)

19 (1.9/14)

3) Cut away the gasket protruding above the fitting

surfaces (as shown in the illustration)

5. Timing Gear Housing

1) Install the timing gear housing to the cylinder body.
2) Tighten the timing gear housing bolt together with the

timing gear housing gasket to the specified torque.

N∙m (kg∙m/lb∙ft)

19 (1.9/14)

3) Cut away the gasket protruding above the fitting

surface (as shown in the illustration).

4. Front Oil Seal (Gear Drive Model)

•

Install oil seal using special tool.
Installer: 5-8840-2061-0

4. Front Oil Seal (Belt Drive Model)

•

Install oil seal using special tool.
Installer: 5-8840-2361-0

NOTE:

Wipe off rust and scraps clean from the press-in
portion of the oil seal.

Take note of the press-in direction of the oil seal.
1) With the oil seal attached to the sleeve, put it in the

front end of the crankshaft.

2) With the edge 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.

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6A-39-2.tif

6A-39-3.tif

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