Isuzu A-4JB1 Repair Manual

ENGINE ASSEMBLY ( 2 )
Crankshaft Journal Diameter mm(in)
Standard Limit
A-4JA1
59.917 – 59.932 59.910
(2.3589 – 2.3595) (2.3587)
A-4JB1
69.917 – 69.932 69.910
(2.7526 – 2.7531) (2.7524)
Crankpin Diameter mm(in)
Standard Limit
52.915 – 52.930 (2.0833 – 2.0839) 52.906 (2.0829)
Crankshaft Journal and Crankpin
Uneven Wear mm(in)
Standard Limit
0.05 (0.002) or less 0.08 (0.0031)
67
Crankshaft Journal and Bearing Clearance
If the clearance between the measured bearing inside
diameter and the crankshaft journal diameter exceeds
the specified limit, the bearing and/or the crankshaft
must be replaced.
Crankshaft Bearing Cap Bolt
Torque kgf·m(lb.ft./N·m)
16.0 – 18.0 (115.7 – 130.2/156.9 – 176.5)
Crankshaft brg’ cap Bolt Torque
Crankshaft Journal and
Bearing Clearance mm(in)
Standard Limit
0.035 – 0.080 (0.0014 – 0.0031) 0.11 (0.0043)
Connecting Rod Bearing Inside Diameter
1. Install the bearing to the connecting rod big end.
2. Tighten the bearing cap to the specified torque.
Connecting Rod Bearing Cap Bolt
Torque kgf·m(lb.ft/N·m)
8.0 – 9.0 (57.9 – 65.1/78.4 – 88.2)
3. Use a inside dial indicator to measure the connect-
ing rod bearing inside diameter.

Isuzu A-4JB1 Specifications

General

Brand	Isuzu
Model	A-4JB1
Category	Engine
Language	English