Isuzu 4JA1 Workshop Manual page 103

Connecting Rod Bearing Inside Diameter
1. Install the bearing to the connecting rod big end.
2. Tighten the bearing cap to the two step of anglar tightening
method.
Connecting Rod Bearing Cap Bolt Torque
4JA1T (L),
4JA1TC
4JH1TC
015RY00011
3. Use an inside dial indicator to measure the connecting rod
bearing inside diameter.
Crankpin and Bearing Clearance
If the clearance between the measured bearing inside diameter
and the crankpin exceeds the specified limit, the bearing
and/or the crankshaft must be replaced.
Crankpin and Bearing Clearance
4JA1T (L),
4JA1TC
4JH1TC
Clearance Measurements (With Plastigage)
Crankshaft Journal and Bearing Clearance
1. Clean the cylinder body, the journal bearing fitting surface,
the bearing caps, and the bearings.
2. Install the bearings to the cylinder body.
3. Carefully place the crankshaft on the bearings.
4. Rotate the crankshaft approximately 30° to seat the
bearing.
5. Place the Plastigage (arrow) over the crankshaft journal
015RY00012
across the full width of the bearing.
6. Install the bearing caps with the bearing.
7. Tighten the bearing caps to the specified torque.
Crankshaft Bearing Cap Bolt Torque
Do not allow the crankshaft to turn during bearing cap
installation and tightening.
8. Remove the bearing cap.
015RY00013
ENGINE MECHANICAL 6A – 81
78-88 (8.0/57 – 9.0/65)
1st step ; 29.0–29.2 (3.00/22.0–3.01/22.2)
2nd step ; 45°-60°
Standard
0.029-0.066
(0.0011-0.0026)
0.029-0.083
(0.0011-0.0033)
167 (17/123)
N·m (kg·m/Ib ft)
mm (in)
Limit
0.100(0.0039)
0.100 (0.0039)
N⋅m (kg⋅m/lb ft)