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Answer :
Final answer:
Valve lash is the necessary gap between the valve stem and the rocker arm in an engine. This gap allows for proper functioning of the valve system and prevents damage to components. The correct answer to the question about the parts separated by valve lash is option A: The valve stem & rocker arm.
Explanation:
Understanding Valve Lash
Valve lash refers to the small gap or clearance between moving engine parts that is necessary to ensure proper operation, particularly in engines with overhead valves. The correct option that describes the parts separated by valve lash is:
- A. The valve stem & rocker arm
When the valve opens, the rocker arm pushes down on the valve stem, and if there is no clearance (or lash), it can cause damage due to insufficient room for the valve to fully seat when closed. In contrast, the other options do not describe parts where valve lash is relevant:
- B. The valve stem & valve guide: This relates to guiding the valve in its position rather than a clearance issue.
- C. The pushrod and rocker arm: This is related to motion transfer in the valvetrain but does not concern valve lash.
- D. The valves & valve retainer: This describes the retention of the valve rather than a clearance gap.
Therefore, the correct answer is A. The valve stem & rocker arm as they are involved in the valve operation where lash must be maintained for proper function.
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