applicable m a n u f a c t u r e r 's o r o t h e r t e c h n i c a l
Q5-7. Which of the following mixtures of ethylene
glycol and water provides the engine with the
maximum freezing protection?
Q5-1. Which of the following components is NOT a
1. 50-percent water and 50-percent ethylene
component of an air-cooling system?
2. 30-percent water and 70-percent ethylene
3. 40-percent ethylene glycol and 60-percent
4. 60-percent ethylene glycol and 40-percent
Q5-2. Which of the following components of a
cooling system directs the flow of air over the
engine to increase cooling efficiency?
Q5-8. When you perform a 0°F accuracy test on a
hydrometer, which of the following ethylene
glycol and water mixtures should you use?
1. One part ethylene glycol and one part
2. Two parts ethylene glycol and one part
Q5-3. An inner core is placed in a radiator on
vehicles that contain which of the following
3. One part ethylene glycol and two parts
A diesel engine
4. Two parts ethylene glycol and three parts
An automatic transmission
A gasoline engine
ENGINE LUBRICATION SYSTEMS
Q5-4. How many valves does a radiator pressure
LEARNING OBJECTIVES: Identify the
components of gasoline and diesel engine
lubrication systems. Identify procedures for
inspecting, testing, and repairing lubrication
system components. Identify troubleshooting
procedures for gasoline and diesel lubrication
Q5-5. Which of the following components is located
systems. Identify procedures for repairing,
in the cylinder head outlet and designed to
removing, and replacing lubrication system
restrict coolant circulation?
equipped with an internal lubrication system. Without
A check valve
lubrication, an engine would quickly overheat, and its
A water jacket
working parts would seize or stick because of
Q5-6. To supplement the action of the thermostat
excessive friction. All the moving parts must be
and provide faster warm-up, stationary
adequately lubricated to assure minimum wear and
engines and large equipment are equipped
long engine life.
with which of the following components?
PURPOSES OF LUBRICATION
A restriction orifices
The primary function of engine lubrication is to
An auxiliary water pump
reduce friction between moving parts. Lubrication