If you increase the clearance between a...

If you increase the clearance between a...

Question 1 of 270705eccefa1bacbc34ba4d476cf

If you increase the clearance between a valve stem and rocker arm, which of the listed conditions will occur?

Question 1 of 27070

Q

If you increase the clearance between a valve stem and rocker arm, which of the listed conditions will occur?

🔍 Key Concepts

• Relationship between valve lash (clearance) and valve timing in a diesel engine • How increasing clearance affects when the rocker arm actually begins to move the valve stem • Difference between valve timing (open/close events) and fuel injection quantity

💭 Think About

• Visualize the rocker arm and valve stem: if the gap between them is larger, does the rocker start moving the valve earlier or later in the cam’s rotation? • Once the cam lobe has passed its peak, with extra clearance, does the valve continue to follow the lobe as long, or does it stop earlier? • Does changing the mechanical clearance between the rocker and valve directly change injection pump stroke (fuel quantity), or mainly the timing of valve motion?

✅ Before You Answer

• Focus first on how increased lash = more lost motion before the valve starts to move. • Decide whether that lost motion affects the opening moment, the closing moment, or both – and in which direction (earlier vs later). • Confirm whether fuel quantity is controlled primarily by the injection pump settings or by the valve/rocker clearance.