Liquid Cooled Engines

Question 1

How does a liquid cooled engine work?

Answer 1

A liquid coolant is circulated in pockets strategically positioned around the engine. Heat transfers from the cylinder walls to the coolant, A coolant/water pump circulates the coolant in a pressurized loop from the water jacket to the radiator/heat exchanger. Heat transfers from coolant to air.

Question 2

Parts of liquid cooled engines? (10)

Answer 2

Cooling fan, Radiator, Water Passages, Open flow, Top hose, Thermostatic valve, water pump, pressure relief cap, bottom hose, and engine assembly.

Question 3

Thermostatic valve parts

Answer 3

Rubber diaphragm, wax pellet, jiggle pin.

Question 4

How does the thermostatic valve work?

Answer 4

When the thermostatic valve is closed: The liquid coolant circulated around the engine block only and cold.
When the thermostatic valve is open: The liquid coolant circulates around the engine block and radiator. It’s hot.
This valve operated based on its mechanical reaction to heat of the coolant. It turns on and off the flow of coolant.

Question 5

How does a radiator work?

Answer 5

Hot coolant comes in from the engine, washes down through the channels in the radiator and exits cooled out of the lower pipe and then goes back to the engine to get more heat.

Question 6

What are water jackets?

Answer 6

Where the liquid coolant flows and absorbs heat from the cylinders.

Question 7

Water pump

Answer 7

It’s driven by a belt. circulates coolant in a pressurized loop from the water jacket to the radiator/heat exchanger.

Question 8

Advantages (5)

Answer 8

Improved cooling, reduced cooling drag, lower fuel consumption, better wear characteristics, and high altitude capability.

Question 9

Disadvantages

Answer 9

Limits the temperature the engine can produce and requires a large radiator.