Failure Analysis
121
8. Because the oil suspends the abrasive particles, the
engine components that are immersed in oil will show
definite signs of abrasive ingestion especially around
the connecting rod and main bearing journals.
See Figure 11.5.
NOTE: Abrasives that are trapped in the oil will cause the
lower portion of the combustion chamber to wear-
ing more than the upper portion.
NOTE: Wear of only one bearing surface on a new engine
could be a sign of a manufacturing defect.
NOTE: Abrasive particles can also be embedded into
materials that are softer than the abrasive. This will
cause the affected part to act like a piece of sand
paper or a grinding wheel. See Figure 11.6.
Figure 11.6
Embedded abrasives
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