Engines 1

What is the purpose of lubrication in an engine?

To reduce friction among moving parts, preventing wear and tear.

Cooling in an engine primarily helps to __________.

Dissipate heat generated by friction and combustion.

What does engine oil do for sealing?

It aids in sealing piston rings to maintain compression and prevent escape of combustion gases.

What is one function of additives in engine oil?

To enhance performance, such as modifying viscosity with Viscosity Index Improvers.

What are viscosity index improvers used for?

To modify engine oil's viscosity for consistent thickness across temperatures.

The pour point of engine oil indicates __________.

The lowest temperature at which the oil will flow.

SAE ratings are assigned for __________.

Viscosity of engine oil.

Why are synthetic oils often more expensive?

They offer superior performance in extreme temperatures.

What is the typical frequency for an oil change?

Every 7,500 to 12,000 miles or every six months, depending on conditions.

What is the primary function of the cooling system in an engine?

To prevent engine overheating by removing excess heat.

Which components are key in the cooling system?

Radiator, water pump, thermostat, and coolant.

How does coolant flow in the cooling system?

It circulates through the engine, absorbs heat, and transfers it to the radiator.

What is the role of the thermostat in an engine?

To regulate engine temperature by controlling coolant flow.

What material are most radiators made from?

Aluminum, designed to maximize heat transfer.

How do pressure caps affect the cooling system?

They ensure the system remains pressurized, raising the boiling point of coolant.

What is the role of an oil filter in an engine?

To remove contaminants from the engine oil.

What does 'oil viscosity' refer to?

The thickness of the oil and its ability to flow.

What happens if you use the wrong viscosity oil?

It can lead to increased engine wear and reduced performance.

What is the function of a water pump in an engine?

To circulate coolant throughout the engine and radiator.

How often should you check your engine oil level?

At least once a month or before long trips.

What is engine knocking?

A sound produced by premature combustion in the engine.

What is the purpose of a timing belt?

To synchronize the rotation of the crankshaft and camshaft.

What is a common symptom of low engine oil?

A warning light on the dashboard and engine noise.

What does engine knock indicate?

It indicates improper combustion or a fuel problem.

What are the effects of using low-quality engine oil?

Increased wear and tear and potential engine damage.

What is the purpose of a catalytic converter?

To reduce harmful emissions from the engine exhaust.

What is the significance of the engine block?

It houses the engine's internal components and provides structural support.

What role do spark plugs play in an engine?

To ignite the air-fuel mixture in the combustion chamber.

What is a common cause of engine overheating?

Low coolant level or a malfunctioning thermostat.

What is the purpose of an oil cooler?

To lower the temperature of engine oil to prevent overheating.

What is the impact of oil sludge in an engine?

It can block oil passageways and cause severe engine damage.

What are the signs of a failing water pump?

Coolant leaks and overheating engine.

What does an oil analysis test assess?

The condition of the oil and the presence of contaminants.

Why is high mileage oil formulated differently?

To contain additives that help with seal conditioning and reduce oil burn-off.

What is the role of a fuel injector?

To spray a precise amount of fuel into the engine's combustion chamber.

What does 'engine misfire' mean?

When one or more cylinders do not produce power effectively.

How does a turbocharger work?

It uses exhaust gases to spin a turbine, increasing engine power.

What does the term 'blow-by' refer to?

Gases that escape past the piston rings into the crankcase.

What is the benefit of periodic engine flushing?

It removes deposits and sludge, improving engine efficiency.

What is the primary function of the alternator?

To charge the battery and power the electrical system.

What is engine compression?

The pressure created in the cylinder during the compression stroke.