🔍 Key Concepts

• Look at how many cylinders there are and remember how many crankshaft degrees occur in one complete 4‑stroke cycle. • Think about the firing order implied by the cam nose positions and how often a cylinder must fire during two crank revolutions. • Consider that the firing intervals in a multi‑cylinder engine are usually evenly spaced around the crankshaft rotation.

💭 Think About

• How many total crank angle degrees are involved in one full operating cycle for this diesel engine, and how does that relate to the number of cylinders? • If each cylinder fires once per full cycle, what crank angle separation would give you evenly spaced firings over that cycle? • Looking at the cam positions under the illustration, what is the pattern in the degree numbers, and what does that suggest about the spacing between firings?

✅ Before You Answer

• Confirm whether this is a four‑stroke or two‑stroke diesel and use the correct total crank angle for one full cycle (either 720° or 360°). • Divide the total crank angle of one full cycle by the number of cylinders to find the theoretical even firing interval. • Verify that this interval is consistent with the degree markings shown under the cylinders in the illustration.