A 4-stroke, medium-speed, eight cylinder,...

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Question 1 of 205eccefa1bacbc34ba4d473c9

A 4-stroke, medium-speed, eight cylinder, in-line diesel engine has a firing order of 1-5-2-6-8-4-7-3. When performing routine valve maintenance, #1 cylinder is set at TDC in firing position. Which exhaust valves can be checked for proper valve lash?

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🔍 Key Concepts

• 4-stroke cycle timing and what TDC on the firing stroke means for valve position • How firing order relates to crankshaft angle spacing in an 8-cylinder, 4-stroke engine • Which valves are safe to set when the lifter is on the cam base circle (no lift)

💭 Think About

• Sketch or imagine the 4-stroke cycle (intake, compression, power, exhaust) and decide which stroke #1 cylinder is on at TDC firing position, and what its exhaust valves are doing then. • From the firing order, determine which cylinders are roughly 180° out, 90° ahead, or 90° behind #1, and think about which ones might be in valve overlap (both valves slightly open). • Ask yourself: when is it safe to measure lash – during valve motion, or when the valve is fully closed and the cam lobe is not lifting?

✅ Before You Answer

• Be sure you know that an 8-cylinder, 4-stroke engine divides the full 720° crankshaft cycle evenly among cylinders. • Confirm which cylinders will have closed exhaust valves (on the base circle) when #1 is at TDC on its firing stroke – avoid any cylinders that could be near valve overlap. • Double-check that every cylinder you select meets the condition: exhaust valve fully closed, not opening or closing.

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