Lesson 4/Learning Event 3
If a large amount of sludge is found in the breather pipe, vent lines, or in the ventilator valve, check the
cooling system--especially the thermostat. Remember the engine must get hot enough to vaporize the water
and fuel that gets onto the crankcase. If the engine thermostat opens too soon (at a low engine temperature),
sludge is sure to form in the crankcase and breather lines.
Proper care of the lubrication and ventilation systems can lengthen the life of the engine. If care is not given
to these systems, you can expect to replace a lot of engines. A practice task list is included with this lesson.
Practice as many of the tasks as you can.
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