PRIN. OF INTERNAL COMBUSTION ENGINES - OD1619 LESSON 2/TASK 2
accelerates wear. Water, one of the products of combustion, will seep by the
piston rings as steam and condense in the crankcase. The water in the crankcase
then will emulsify with the oil to form a thick sludge. Products of fuel
oil, when mixed with the contaminants, loses its lubricating qualities and becomes
acidic. Engine oil must be changed periodically to prevent contaminated oil from
controlled in the following ways:
FIGURE 49. HOW OIL LUBRICATES.
(a) Control engine temperature; a hotter running engine burns its fuel more
completely and evaporates the water produced within it before any appreciable oil
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