Operation of exhaust and intake valves in an automobile engine consists of the cam C, push...

Operation of exhaust and intake valves in an automobile engine consists of the cam C, push rod DE, recker arm EFG which is pinned at F, and a spring and valve, V. If the compression in the spring is 20 mm when the valve is open as shown, determine the normal force acting on the earn lobe at C. Assume the cam and bearings at H, I, and J are smooth. The spring has a stiffness of 300 N / m.