Mercury F8CZ-6211-AA Bearing - Connecting Rod

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Lack of lubrication can result from excessive heat (which thins the oil), overloading (which squeezes oil from the bearing face), and oil leakage (due to excessive bearing clearances, worn oil pumps, or high engine speeds). Blocked oil passages, often from misaligned oil holes in a bearing shell, can also starve a bearing of oil. When lubrication fails, the bearing material may be wiped or extruded from the shell's steel backing, and temperatures may rise to the point where the steel backing turns blue from overheating.