Crankshaft, Main Bearings, and Flywheel
02
040
15
RG,15,DT7461
–19–18MAY00–1/1
Crankshaft and Main Bearing Failure
Analysis
Scored Main Bearing (Diagnosis also applies to
connecting rod bearing.):
•
Oil starvation.
•
Contaminated oil.
•
Engine parts failure.
•
Excessive heat.
•
Poor periodic service.
Galled or “Wiped” Bearings:
•
Fuel in lubricating oil (incomplete combustion).
•
Coolant in lubrication system (cracked block, liner seal
failure, or leaking coolant pump seal with plugged hole).
•
Insufficient bearing oil clearance.
•
Parts not lubricated prior to engine operation.
•
Wrong bearing size.
Inconsistent Wear Pattern:
•
Misaligned or bent connecting rod.
•
Warped or bowed crankshaft.
•
Distorted cylinder block.
Broken Main Bearing Caps:
•
Improper installation.
•
Dirt between bearing and crankshaft journal.
•
Low oil pressure.
•
Oil pump failure.
Cracked, Chipped or Broken Bearings:
•
Overspeeding.
•
Excessive idling.
•
Lugging.
•
Excessive oil clearance.
•
Improper installation.
CTM100 (06APR04)
02-040-15
P
OWER
T
ECH
10.5 L & 12.5 L Diesel Engines
040604
PN=211
Summary of Contents for 6105ADW
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Page 50: ...Contents 02 CTM100 06APR04 02 4 POWERTECH 10 5 L 12 5 L Diesel Engines 040604 PN 4 ...
Page 334: ...Contents 03 CTM100 06APR04 03 2 POWERTECH 10 5 L 12 5 L Diesel Engines 040604 PN 2 ...
Page 350: ...Contents 04 CTM100 06APR04 04 2 POWERTECH 10 5 L 12 5 L Diesel Engines 040604 PN 2 ...
Page 376: ...Contents 05 CTM100 06APR04 05 2 POWERTECH 10 5 L 12 5 L Diesel Engines 040604 PN 2 ...
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