Q:1. Explain why clearance is provided between the rocker arm and the head valve stem?
A:1. As the engine comes up to working temperature the valves, because of the higher temperatures in the cylinder will expand at a greater rate than the cylinder head and rocker gear.This is especially applicable to the exhaust valves.if no clearances valves.If no clearance was provided then the valve would expand downwards into the cylinder, preventing the valve from closing.
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