Page 180 - Mechanic Diesel - TT

MECHANIC DIESEL - CITS

4 Polyalkylene Glycol (PAG): Used in some industrial uses.

5 Hydrocarbon based: It is used in some special uses.
6 Glycol based: A mixture of water with ethylene or propylene glycol, chosen in various industries for their
antifreeze and heat dispersing properties.

Each coolant has its own benefits and is used based on temperature requirements, environmental concerns and
cost.
Properties of Coolant:
a High thermal capacity: The thermal capacity of the coolant should be high, that is, heat should be absorbed
by the coolant with great efficiency.
b Low viscosity: A good coolant is one in which viscosity is almost negligible. Coolants with low viscosity flow
faster.
c Low cost: Coolants should be available in the market at low prices, so that they can be purchased easily.
d Non - toxic: Coolants should be non- toxic, otherwise when they come in contact with heat, they react
chemically and release toxic gases, which can prove fatal for human health.
e Chemical inertness: Coolant should not be a chemical reagent, otherwise the coolant reacts chemically with
the engine parts, resulting in problems like rusting etc.

f Electrical insulator: The coolant should be a bad conductor of electricity. If the coolant is a good conductor
of electricity, there is a possibility of spark in the engine.

Importance of maintaining correct coolant-water ratio

Objectives: At the end of this lesson you shall be able to
• explain Importance of maintaining correct coolant-water ratio.

Maintaining the correct coolant-water ratio in your vehicle’s cooling system is crucial for several reasons:

1 Temperature Regulation: Coolant helps regulate the engine’s temperature, preventing it from overheating or
freezing. The right ratio ensures optimal heat transfer and efficient cooling.
2 Corrosion Protection: Coolant contains corrosion inhibitors that protect the cooling system components,
such as the radiator, water pump, and hoses, from rust and corrosion. The proper ratio ensures adequate
protection for these parts.

3 Freezing and Boiling Point: The ratio affects the coolant’s freezing and boiling points. Too much water lowers
the boiling point, risking overheating, while too much coolant raises the freezing point, potentially causing
damage in cold weather.

4 Heat Dissipation: Water has better heat transfer properties than coolant alone, but coolant provides corrosion
protection and prevents freezing. The right balance optimizes both heat transfer and system protection.
5 Longevity: Maintaining the correct ratio prolongs the life of the cooling system components by preventing
corrosion and minimizing the risk of overheating or freezing, reducing the likelihood of costly repairs or
replacements.
Overall, the correct coolant-water ratio ensures efficient cooling, protects the cooling system from damage, and
contributes to the vehicle’s overall longevity and performance.
Coolant water ratio: Maintaining the correct coolant-water ratio in your vehicle’s cooling system is crucial for optimal
performance and preventing overheating or freezing. Typically, a 50/50 mix of coolant and water is recommended
for most vehicles. You can use a hydrometer or a refractometer to measure the coolant concentration and adjust
as needed. Regularly checking and maintaining this ratio helps ensure your engine stays cool and protected.

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CITS : Automotive - Mechanic Diesel - Lesson 47 - 56 CITS : Automotive - Mechanic Diesel - Lesson 47 - 56