Understanding Cylinder Leak Down Testing

What is the first step in performing a cylinder leak down test?

• Remove the spark plugs

• Warm up the engine

• Connect the leak down tester

• Check the oil level

Which tool is essential for conducting a leak down test?

• Compression gauge

• Leak down tester

• Torque wrench

• Multimeter

What does a leak down test measure?

• Engine oil pressure

• Cylinder compression

• Percentage of air leakage

• Fuel injector performance

If a cylinder shows more than 20% leakage, what does it indicate?

• Normal engine condition

• Minor wear and tear

• Significant engine problem

• Incorrect test procedure

What is a common cause of air leaking through the exhaust valve during a leak down test?

• Worn piston rings

• Blown head gasket

• Bent or burnt exhaust valve

• Cracked cylinder wall

How can you confirm a head gasket leak during a leak down test?

• Air bubbles in the radiator

• Oil on the spark plug

• High oil pressure

• Low fuel efficiency

What does it mean if air is heard escaping from the oil filler cap during a leak down test?

• Faulty fuel injector

• Worn piston rings

• Leaking intake valve

• Blown head gasket

Which of the following is NOT a common cause of cylinder leaks?

• Cracked cylinder head

• Faulty spark plug

• Worn piston rings

• Burnt valves

What should be done if a cylinder shows excessive leakage?

• Replace the spark plugs

• Adjust the timing belt

• Perform further diagnostics to identify the cause

• Increase the engine oil level

During a leak down test, air escaping from the intake manifold indicates a problem with which component?

• Exhaust valve

• Intake valve

• Piston rings

• Cylinder head gasket