The Exhaust Valve of a Mercury Capri opens after the power stroke to allow burnt gases to escape the cylinder. It eventually closes to seal the chamber for the next compression. Through the valvetrain, camshaft lobes actuate the Exhaust Valve, which responds to lifters, pushrods, and rocker arms in overhead valve layouts or to direct cam followers or buckets in overhead cam designs found in Capri engines. In accordance with factory Mercury specifications, the Exhaust Valve is held down with valve springs with a seat pressure of about 70 to 90 pounds and is roughly 200 pounds when fully open, with a pressure that prevents valve float at rising engine speeds. If you have too much clearance, it will increase the impact forces each time the Exhaust Valve takes up lash, which promotes overheating, distortion, cracking, and loss of power. To ensure proper and reliable operation of a Mercury Capri, it is essential that the Exhaust Valve stay cool and intact, while the valve springs on every model must operate at the proper pressure. These protections help sustain compression and performance between Mercury engines.
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