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MEO Class II – EK-Motor : 2019/AUG/02 – 2019/OCT/03 – 2019/NOV/06 – 2023/JAN/04 – 2023/JUN/02 – 2023/AUG/06 – 2024/MAR/01

Question

Q6. What is "virtual tappet" in the hydraulically actuated air spring return exhaust valves, and how is it set. Explain why the damage occurs to the seats of the exhaust valves due to furrowing and cutting and how an incident of "valve drop" leading to extensive damage to running gear can occur.

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