IN THE SPRING PISTON TYPE EXHAUST VALVE, WITH NO VALVE SPRING VISIBLE, SOME METHOD HAS TO BE USED TO ENABLE THE ENGINEER TO CHECK THE VALVE IS LIFTING OR ROTATING.
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| HOW TO CHECK EXHAUST VALVE ROTATION |
AT THE TOP OF THE EXHAUST VALVE CASING IS A SPRING LOADED CHECK ROD WHICH PASSES THROUGH A BUSH AND HAS CONTACT WITH A GROOVE IN THE TOP OF THE AIR PISTON.
AS THE PISTON REACHES THE TOP OF ITS OPERATING STROKE, IT CAUSES THE CHECK ROD TO LIFT, INDICATING THAT THE VALVE IS OPENING.
NOW, THE ACTION OF THE VALVE ROTATION PRODUCES FURTHER MOVEMENT TO THE SPRING LOADED CHECK ROD MAKING IT SLIGHTLY ROTATE THUS INDICATING THE VALVE IS ROTATING.
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