Isuzu NHR 4J Series, Workshop Manual

Page: 102 / 406

GENERAL ENGINE MECHANICAL 6A – 35
3. Use a syringe to apply the solution to the surface to be
inspected.
Hold the surface to be inspected perfectly horizontal to
prevent the solution from running.
NOTE:
Do not allow the solution to come in contact with the
oil ports and their surrounding area.
Testing
1. Wait for thirty to forty seconds.
If there is no discoloration after thirty or forty seconds,
the crankshaft is usable.
If discoloration appears (the surface being tested will
become the color copper), the crankshaft must be
replaced.
2. Steam clean the crankshaft surface immediately after
completing the test.
NOTE:
The ammonium cupric chloride solution is highly
corrosive. Because of this, it is imperative that the
surfaces being tested be cleaned immediately after
completing the test.
CRANKSHAFT BEARING SELECTION
When installing new crankshaft bearings or replacing old
bearings, refer to the selection table.
NOTE:
Please note that some Crankshaft No. 4 journals made
during a limited production period have their number
(No. 4) marked on either their front or rear side of
webs as shown below.
NOTE:
Although all upper journal bearings (cylinder body
side) have oil grooves and holes, all lower bearings
(bearing cap side) have no groove and hole.
Play close attention to the distinction during the
installation procedure.
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