Engine : Motor Plants and Auxiliary Boilers - 157/947
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| In a normally operating diesel engine, the main source of lubricating oil contamination in the crankcase is a result of the __________. |
| A) air when no air cleaners are used |
| B) combustion by-products removed from the cylinder walls |
| C) condensation of water vapors |
| D) metal particles loosened by wear |
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