Fiat Kobelco EX355 Tier2, Техническое руководство

Страница: 882 / 968

W5-3-102 EX355
ENGINE OVERHAUL
CRANKSHAFT TUFFTRIDING INSPECTION
• Use an organic cleaner to thoroughly clean the
crankshaft. There must be no oil on the crankshaft.
• Prepare a 5 -10% solution of ammonium cuprous
chloride (dissolved in distilled water).
• Use a syringe to apply the solution to the crankshaft.
Hold the surface 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.
CRANKSHAFT TUFFTRIDING JUDGMENT
• Wait for 30 to 40 seconds.
If there is no discoloration after 30 or 40 seconds,
the crankshaft is usable.
If discoloration appears (the surface being tested
will become the color of copper), the crankshaft
must be replaced.
• Steam clean the crankshaft surface immediately
after completing the test.
NOTE: The ammonium cuprous chloride solution is
highly corrosive. Because of this, it is imperative that
the surfaces being tested by cleaned immediately
after completing the test.
SM7245
The portion to be tested
must be held horizon-
tally so as not to let the
test solution flow.
The sliding surface of
the pin or journal.
Test liquid should not
be applied to the area
around the oil port.
Approximately
1.0mm (0.4in)
CRANKSHAFT JOURNAL AND BEARING CLEAR-
ANCE
If the clearance between the measured bearing inside
diameter and the crankshaft journal diameter ex-
ceeds the specified limit, the crankshaft must be
replaced.
Crankshaft journal and Bearing clearance
Standard:
No.4 journal: 0.093 - 0.124 mm (0.00366 -
0.00488 in)
Others: 0.063 - 0.094 mm (0.00248 - 0.00370 in)
Limit: 0.14 mm (0.0055 in)
SM7244