Answer :
Final answer:
Both technicians are correct. Technician A is spot on about the replacement of valve stem seals without full engine disassembly in some cases. Also, the role of rocker arms is to regulate valve operation, and incorrect function can definitely influence valve lift, as stated by Technician B.
Explanation:
Both Technician A and B are correct in their statements. Technician A is accurate in saying that on some engines, valve stem seals can be replaced without removing the head. This is possible in engines where the valve stems are accessible without fully disassembling the engine.
Moreover, Technician B is also correct. The role of rocker arms in an engine is to regulate the opening and closing of an engine's valves. Therefore, if they are worn or not functioning properly, they can indeed affect valve lift. Valve lift is the distance that the valve is lifted off its seat at the camshaft's command. If the rocker arms are not performing their job, the valve lift can be affected, resulting in diminished engine performance.
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