The Mercury Lynx Exhaust Valve lets burned gases out so the compact engine generates plenty of power and runs clean. Opening immediately after the power stroke, this Exhaust Valve follows the camshaft lobe. In the original overhead valve (OHV) versions, it does so through a chain of lifter, pushrod, and rocker, while later overhead cam (OHC) versions have the cam right above the valve or on a light bucket follower, shortening the path and reducing friction. Mercury provided both layouts during production. No matter the design, the Exhaust Valve should seal tight until commanded to open because any leakage robs compression and the small Mercury four-cylinder of acceleration. Heat is the maximum enemy of the valve. When the temperature climbs, the valve can burn, warp, or crack, causing Lynx to idle rough, misfire, and have poor mileage. The Exhaust Valve is kept closed by stout springs that exert up to 200 pounds of pressure when fully opened. As a result, the valve will not float at high rpms to the point it can kiss a piston. Each Lynx with the later configuration revs more quickly, while the early Lynx works with proven pushrod pieces, and constant clearance keeps any Lynx quiet as the Exhaust Valve prevents excessive lash, allowing Mercury owners to enjoy steady torque.
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