The intake valves in a 4-stroke diesel...

Question 1 / 270705eccefa1bacbc34ba4d4765a

Question 1 of 270705eccefa1bacbc34ba4d4765a

The intake valves in a 4-stroke diesel engine are reseated by __________.

Question 1 of 27070

The intake valves in a 4-stroke diesel engine are reseated by __________.

🔍 Key Concepts

• 4-stroke diesel valve operation (intake vs exhaust strokes) • What actually causes a poppet valve to CLOSE after the cam lobe passes • Difference between parts that move the valve open (cam, follower, push rod, rocker) and parts that force it shut

💭 Think About

• Trace the motion path: camshaft → cam follower → push rod → rocker arm → valve stem. Which of these is actively pushing the valve open, and which is responsible for closing it? • When the cam lobe rotates away and is no longer lifting the valve, what force or component makes sure the valve returns firmly to the seat? • Could combustion gas pressure reliably close the INTAKE valve on every cycle, or must there be a mechanical device that works even at low or zero pressure?

✅ Before You Answer

• Identify which components only transmit motion from the cam versus which components actually store energy to close the valve. • Ask yourself: on a non-running engine turned by hand, what still makes the valves snap shut? That’s the same mechanism used in operation. • Verify which option is specifically designed to keep the poppet valve tightly seated against the valve seat to maintain compression.

Question 1 of 27070

The intake valves in a 4-stroke diesel engine are reseated by __________.

cam followers

push rods

combustion gases

valve springs

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