Crankshaft Run-Out; Bearing Tension; Crankshaft Journal And Crankpin Diameter - Isuzu A-4JA1 Workshop Manual

ENGINE ASSEMBLY ( 2 )
3 4
1
2 2
1
66
Note:
The ammonium cuprous chloride solution is highly cor-
rosive. Because of this, it is imperative that the surfaces
being tested be cleaned immediately after completing
the test.

Crankshaft Run-Out

1. Set a dial indicator to the center of the crankshaft
journal.
2. Gently turn the crankshaft in the normal direction of
rotation.
Read the dial indicator as you turn the crankshaft.
If the measured value exceeds the specified limit,
the crankshaft must be replaced.
Crankshaft Run-Out
Standard
0.05 (0.002) or less

Bearing Tension

Check to see if the bearing has enough tension, so that a
good finger pressure is needed to fit the bearing into
position.

Crankshaft Journal and Crankpin Diameter

1. Use a micrometer to measure the crankshaft journal
diameter across points ("1 – 1") and ("2 – 2").
2. Use the micrometer to measure the crankshaft
journal diameter at the two points ( 3 and 4 ).
3. Repeat Steps 1 and 2 to measure the crankpin
diameter.
If the measured values are less than the limit, the
crankshaft must be replaced.
mm(in)
Limit
0.08 (0.0031)