Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual — part 565

6A – 98 ENGINE MECHANICAL

9. Compare the width of the Plastigage attached to either

the crankshaft or the bearing against the scale printed
on the Plastigage container.

If the measured value exceeds the limit, perform the
following additional steps.
1) Use a micrometer to measure the crankshaft

outside diameter.

2) Use an inside dial indicator to measure the

bearing inside diameter.
If the crankshaft journal and bearing clearance
exceeds the limit, the crankshaft and/or the
bearing must be replaced.

Crankshaft Journal and Bearing Clearance

mm (in)

Standard Limit

0.031 – 0.064

(0.0012 – 0.0025)

0.110 (0.0043)

Crankpin and Bearing Clearance

1. Clean the crankshaft, the connecting rod, the bearing

cap, and the bearings.

2. Install the bearing to the connecting rod and the

bearing cap.
Do not allow the crankshaft to move when installing
the bearing cap.

3. Prevent the connecting rod from moving.
4. Attach the Plastigage to the crankpin.

Apply engine oil to the Plastigage to keep it from
falling.

5. Install the bearing cap and tighten it to the specified

torque.
Do not allow the connecting rod to move when
installing and tightening the bearing cap.

Connecting Rod Bearing Cap Bolt
Torque kg·m

(lb.ft/N·m)

4JA1 / 4JA1T engine

8.5

± 0.5(61.4 ± 3.6 / 83.3 ± 4.9)

1st step ; 3.0

± 0.5(21.7 ± 3.6 /

29

± 5)

4JB1T / 4JG2T /
4JA1TC / 4JH1TC
engine

2nd step ; 45

° ~ 75°

ENGINE MECHANICAL 6A – 99

6. Remove the bearing cap.
7. Compare the width of the Plastigage attached to either

the crankshaft or the bearing against the scale printed
on the Plastigage container.
If the measured value exceeds the specified limit,
perform the following additional steps.

1) Use a micrometer to measure the crankpin

outside diameter.

2) Use an inside dial indicator to measure the

bearing inside diameter.
If the crank pin and bearing clearance exceeds the
specified limit, the crankshaft and/or the bearing
must be replaced.

Crankpin and Bearing Clearance

mm (in)

Standard Limit

0.029 – 0.066

(0.0011 – 0.0026)

0.100 (0.0039)

CRANKSHAFT BEARING SELECTION

Crankshaft bearing selection is based on the measured
diameters of the crankshaft journals and the bearing
inserts.
Match the crankshaft bearing housing grade marks and
the crankshaft journal grade marks in the table below to
determine the correct crankshaft bearing size.

Crankshaft Bearing Housing Grade Mark
Position

Crankshaft bearing housing grade marks 1 or 2 are
stamped on the rear right hand side of the cylinder body.
Example:

1

2

1

1

2

No. 1 Bearing

Housing

No. 2 Bearing

Housing

No. 3 Bearing

Housing

No. 4 Bearing

Housing

No. 5 Bearing

Housing

Crankshaft Journal Grade Mark Position

The crankshaft journal grade marks (1 or -) are stamped
on each crankshaft journal web.
The crankshaft journal and bearing clearance must be the
same for each position after installation of the crankshaft
and the crankshaft bearings.
Note:
The crankshaft journal mark No. 4 is stamped on
crankshaft No. 4 journal web front side or rear side.

6A – 100 ENGINE MECHANICAL

REFERENCE
4JA1, 4JA1T, 4JA1TC ENGINE mm

(in)

Crankshaft Bearing

Q

Crankshaft Journal

R

Grade

Mark

Diameter

Grade

Mark

Diameter

Crankshaft

Bearing

Size Color

Code

S

1 or

-

59.927 – 59.932

(2.3593 – 2.3595)

Black

2 or

- -

59.922 – 59.927

(2.3591 – 2.3593)

1

63.987 –

64.000

(2.5191 –

2.6196)

3 or

- - -

59.917 – 59.922

(2.3589 – 2.3591)

Blue

1 or

-

59.927 – 59.932

(2.3593 – 2.3595)

2 or

- -

59.922 – 59.927

(2.3591 – 2.3593)

Green

2

63.975 –

63.987

(2.5186 –

2.5191)

3 or

- - -

59.917 – 59.922

(2.3589 – 2.3591)

Black

4JB1T, 4JG2T, 4JH1TC ENGINE mm

(in)

Crankshaft Bearing

Q

Crankshaft Journal

R

Grade

Mark

Diameter

Grade

Mark

Diameter

Crankshaft

Bearing

Size Color

Code

S

1 or

-

69.927 – 69.932

(2.7530 – 2.7532)

Black

2 or

- -

69.922 – 69.927

(2.7528 – 2.7530)

1

73.987 –

74.000

(2.9129 –

2.9134)

3 or

- - -

69.917 – 69.922

(2.7556 – 2.7528)

Blue

1 or

-

69.927 – 69.932

(2.7530 – 2.7532)

2 or

- -

69.922 – 69.927

(2.7528 – 2.7530)

Green

2

73.975 –

73.987

(2.9124 –

2.9129)

3 or

- - -

69.917 – 69.922

(2.7556 – 2.7528)

Black

ENGINE MECHANICAL 6A – 101

CRANKSHAFT PILOT BEARING

Check the crankshaft pilot bearing for excessive wear and
damage and replace it if necessary.

Crankshaft Pilot Bearing Replacement

Crankshaft Pilot Bearing Removal

Use the pilot bearing remover to remove the crankshaft
pilot bearing.
Pilot Bearing Remover: 5-8840-2000-0
Sliding Hammer:

5-8840-0019-0 (J-23907)

Crankshaft Pilot Bearing Installation

1. Place the crankshaft pilot bearing right angle across

the crankshaft bearing installation hole.

2. Tap around the edges of the crankshaft pilot bearing

outer races with a brass hammer to drive the bearing
into the crankshaft bearing installation hole.

Pilot Bearing Installer: 5-8522-0024-0

Note:
Strike only the crankshaft pilot bearing outer race with
the hammer. Do not strike the bearing inner race.
Bearing damage and reduced bearing service life will
result.