Auto and Shop: Engine Systems and Repair Flashcards

What is the purpose of the intake manifold on an engine?

Answer: Distribute air or air-fuel mixture to each cylinder

The intake manifold distributes the incoming air (or air-fuel mixture on carbureted engines) evenly to each cylinder's intake port.

Which engine stroke draws the air-fuel mixture into the cylinder?

Answer: Intake stroke

During the intake stroke, the piston moves down and the intake valve opens, drawing the air-fuel mixture into the cylinder.

What does an oil pressure warning light indicate?

Answer: Oil pressure is dangerously low, risking engine damage

The oil pressure warning light indicates that oil pressure has dropped below a safe level, which can lead to severe engine damage if not addressed immediately.

What is the function of piston rings in an engine?

Answer: Seal combustion gases and control oil on the cylinder wall

Piston rings seal the combustion chamber against blow-by, transfer heat from the piston to the cylinder wall, and control oil film on the cylinder walls.

A mechanic torques cylinder head bolts in a specific pattern. Why is this important?

Answer: To ensure even clamping pressure and prevent head gasket failure

Torquing head bolts in the correct sequence distributes clamping force evenly across the head gasket, preventing warping and premature gasket failure.

What happens to engine performance when the air filter becomes severely clogged?

Answer: The engine runs rich, loses power, and fuel consumption increases

A clogged air filter restricts airflow, causing a rich air-fuel mixture, power loss, and reduced fuel economy.

What is the role of the flywheel in an engine?

Answer: Store rotational energy to smooth out engine impulses

The flywheel stores rotational (kinetic) energy to smooth power delivery between the firing pulses of the pistons.