Connecting Rod - Isuzu 4JA1 Workshop Manual

6A – 90 ENGINE MECHANICAL

CONNECTING ROD

Connecting Rod Alignment
Use a connecting rod aligner to measure the distortion and the
parallelism between the connecting rod big end hole and the
connecting rod small end hole.
If either the measured distortion or parallelism exceed the
specified limit, the connecting rod must be replaced.
Connecting Rod Alignment Per Length of 100 mm (3.94 in)
015LX034
Distortion
Parallelism
Connecting Rod Side Face Clearance
1. Install the connecting rod to the crankpin.
2. Use a feeler gauge to measure the clearance between the
connecting rod big end side face and the crankpin side
face.
If the measured value exceeds the specified limit, the
connecting rod must be replaced.
Connecting Rod Big End and Crankpin Side Face Clearance
011RY00029
Piston Pin and Connecting Rod Small End
Bushing Clearance
Use a caliper calibrator and a dial indicator to measure the
piston pin and connecting rod small end bushing clearance.
If the clearance between the piston pin and the connecting rod
small end bushing exceeds the specified limit, replace the
piston pin and/or the connecting rod.
Piston Pin and Connecting Rod Small End
Bushing Clearance
015LX028
4JA1T (L)
4JA1TC,
4JH1TC
Standard
0.08 (0.003) or Less
0.05 (0.002) or Less
Standard
0.23 (0.009)
Standard
0.008-0.020
(0.003-0.0008)
0.005-0.018
(0.0002-0.0007)
mm (in)
Limit
0.20 (0.008)
0.15 (0.006)
mm (in)
Limit
0.35 (0.014)
mm (in)
Limit
0.050 (0.002)
0.050 (0.002)