🔍 Key Concepts

• Four-stroke six-cylinder diesel engines fire every 120° of crankshaft rotation over a 720° cycle • The chart shows relative cam nose positions in degrees for each cylinder at the instant #1 is firing • For a right-hand rotation, cylinders will fire in order of increasing crank angle (0°, 60°, 120°, etc.) around the circle

💭 Think About

• List each cylinder next to its degree value from the illustration, then put those cylinders in order from the smallest degree to the largest—what sequence do you get? • Check that the sequence you found advances roughly 120° between firing events—does this match any of the answer choices? • Think about why the cam with the next higher degree value will reach the injection point next as the crankshaft continues to rotate in the direction shown.

✅ Before You Answer

• Be sure you have correctly copied the degree values under each cylinder number from the chart before sorting them • Confirm that your final sequence uses each cylinder number exactly once • Verify that the sequence you select from the choices preserves the same cylinder order you obtained from sorting by increasing degrees.