Verify the crankshaft and camshaft timing marks. In overhead valve engines, pushrods are long, slender metal rods that transmit motion from the camshaft to the valves.
A lifter is attached to the bottom end of a pushrod, where the camshaft makes contact. A thin calibrated plastic strip serves as a plastic gauge. It can be used to measure gaps and monitor bearing clearance. It is utilized at locations on crank or connecting rod bearings where a micrometer measurement cannot be made quickly. When the valve is open, the spring maintains contact between the valve assembly and the camshaft or rocker arm. It also keeps the valve closed. The valve train must press against the spring tension in order to open the valve.
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