Textron Lycoming Cylinder Compression Quiz

What is the purpose of measuring cylinder compression?

• To measure engine temperature

• To assess the condition of the combustion chamber

• To determine fuel efficiency

• To check the oil level

What should be done to prevent accidental firing of the engine during the test?

• Cover the engine with a tarp

• Remove the spark plugs

• Hold the propeller firmly

• Disconnect the battery

What is the acceptable pressure difference between cylinders?

• 1 psi

• 5 psi

• 10 psi

• 20 psi

What indicates that the engine is satisfactory based on pressure readings?

• All cylinders below 60 psi

• All cylinders equal and above 70 psi

• Pressure difference exceeds 15 psi

• Pressure readings vary by 20 psi

What should be done if the pressure reading is below 60 psi?

• Check the oil level

• Increase air pressure

• Remove and overhaul the cylinders

• No action needed

What does low pressure in a single cylinder indicate?

• Air passing by the piston or valve

• Excessive wear on the engine

• Oil leakage

• Fuel contamination

What does air discharged from the breather or oil filler tube indicate?

• Excessive fuel consumption

• Normal operation

• Leakage in the area of the piston and rings

• Low oil pressure

What should be done before attaching the compression tester?

• Change the oil

• Inspect the spark plugs

• Warm up the engine

• Check the air supply regulator

What is the recommended air supply pressure for the test?

• 50 psi

• 60 psi

• 70 psi

• 80 psi

What is the first step in conducting the compression test?

• Inspect the propeller

• Check the fuel supply

• Shut down the engine

• Start the engine