MARINE ENGINES . 391 rod is screwed ( Fig . 272 ) , having a raised screwed part at both ends and double nuts ; by this means the valve can be very accurately set at any time . The hole through the valve should be slightly … oblong , to allow for the wear and close contact between the faces of the valve and cylinder . The valve rod , in some examples , is guided at the end through a hollow brass pipe , or a stuffing box and gland , similar to the front end . In other arrangements the end of the valve spindle is screwed…
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