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Precision Steel Tubes
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O-235 and O-290 Series
www.lycoming.comactuates the valves by means of tappets. The valve rockers are supported on full floating steel shafts. The valve springs bear against hardened steel seats. NOTE Hydraulic tappets which automatically keep the valve clearance at zero are employed on the O-290-D2 series engines while solid tappets are employed on the O-235 and O-290-D series.