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A hydraulic tappet, also known as a hydraulic valve lifter or hydraulic lash adjuster, is a device for maintaining zero valve clearance in an internal combustion engine. Conventional solid valve lifters require regular adjusting to maintain a small clearance between the valve and its rocker or cam follower .
Lycoming Engines is a major American manufacturer of aircraft engines. With a factory in Williamsport, Pennsylvania , Lycoming produces a line of horizontally opposed , air-cooled, four, six and eight-cylinder engines including the only FAA -certified aerobatic and helicopter piston engines on the market.
The engines all employ hydraulic tappets which operate in aluminum guides that are machined into the crankcase. The tappets are built from four parts, a cam follower body, cup, cylinder, and piston and operate with clearances of 0.03 in (1 mm) to 0.11 in (3 mm). The pushrods are steel and feature pressed-in ball ends. [1]
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The Lycoming O-320 is a large family of naturally aspirated, 320 cu in (5.2 L) air-cooled, horizontally-opposed four-cylinder, direct-drive engines produced by Lycoming Engines. Introduced in 1953, it is commonly used on light aircraft such as the Cessna 172 and Piper Cherokee , and remains in production as of 2024.
A hydraulic tappet, also known as a "hydraulic valve lifter" and "hydraulic lash adjuster", contains a small hydraulic piston that becomes filled with pressurised engine oil. [4] [11] The piston acts as a hydraulic spring that automatically adjusts the tappet clearance according to the oil pressure. Although the movements of the piston are ...
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The Cessna 177B Cardinal uses a Lycoming O-360-A1F6D of 180 hp (130 kW). O-360-A1F6D 180 hp (134 kW) at 2700 rpm, Minimum fuel grade 91/96 avgas, compression ratio 8.50:1. Same as the A1F6 except that it is equipped with one Bendix D4LN-2021 impulse coupling dual magneto instead of incorporating two single magneto. [1] [2] O-360-A1G