Aviation Training

Tappet assembly consists of: 1. A cylindrical tappet, which slides in and out in a tappet  guide installed in one of the crankcase sections around  the cam ring; 2. A tappet roller, which follows the contour of the cam  ring and lobes; 3. A tappet ball socket or push rod socket; and 4. A tappet spring. Function -  to convert the rotational  movement of the cam lobe into reciprocating motion  and to  transmit this motion to the push rod, rocker arm, and then  to the valve tip,  opening the valve at the proper time. The  purpose of the tappet spring is to take up the clearance  between the rocker arm and the valve tip to reduce the shock  load when the  valve is opened. A hole is drilled through the  tappet to allow engine oil to flow to the  hollow push rods to  lubricate the rocker assemblies Solid Lifters/Tappets Solid lifters or cam followers generally require the valve  clearance to be a...

The basic major components of a reciprocating engine are Crankcase,  Cylinders,  Pistons,  Connecting rods,  Valves,valve-operating mechanism,  Crankshaft.  In the head of each cylinder are the valves and spark plugs.  One of the valves is in a passage leading from the induction system; the other is in a passage leading to the exhaust system. Inside each cylinder is a movable piston connected to a crankshaft by a connecting rod.