PRIN. OF INTERNAL COMBUSTION ENGINES - OD1619 LESSON 2/TASK 2
FIGURE 50. SOURCES OF OIL CONTAMINATION.
(b) The use of oil filters removes dirt particles from the oil before it
reaches the bearings, minimizing wear.
(c) An adequate crankcase ventilation system will purge the crankcase of
blowby fumes effectively before a large amount of contaminants can six with the oil.
(d) The use of air intake filters trap foreign material and keep it from
entering the engine.
(3) Oil Dilution (refer to figure 50). Engine oil thins out when mixed with
gasoline, causing a dramatic drop in its lubricating qualities. Some of the causes
of oil dilution are the following:
(a) Excessive use of a hand choke causes an overrich mixture and an abundance
of unburned fuel to leak past the piston rings into the crankcase. The same
condition can occur on vehicles equipped
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