AIR INLET AND EXHAUST SYSTEMTM 5-3805-263-14&P-2CYLINDER HEAD AND VALVESThere is one cylinder head for all four cylinders.Each cylinder has one intake and one exhaust valve.The cylinder head has valve seats installed andthey can be replaced.The valve guides can be replaced. There arethreads on the inside diameter of the valve guides tohold oil that lubricates the valve stem.VALVES AND VALVE MECHANISMThe valves and valve mechanism control the flowof air and exhaust gases in the cylinder during engineoperalion.The intake and exhaust valves are opened andclosed by movement of these components; crank-SYSTEMS OPERATIONshaft, camshaft, valve lifters (cam followers), pushrods, rocker arms and valve spring. Rotation of thecrankshaft causes rotation of the camshaft. Thecamshaft gear is driven by, and timed to, a gear onthe front of the crankshaft. When the camshaftturns, the cams on the camshaft also turn and causethe valve lifter (cam followers) to go up and down.This movement makes the push rods move the rockerarms. The movement makes the push rods move therocker arms. The movement of the rocker arms willmake the intake and exhaust valves in the cylinderhead open according to the firing order (injectionsequence) of the engine. A valve spring for each valvepushes the valve back to the closed position.Valve rotators cause the valves to have rotationwhile the engine is running. This rotation of thevalves keeps the deposit of carbon on the valves to aminimum and gives the valves longer service life.1-14
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