TM 5-3805-260-24CYLINDER HEAD AND VALVES1. Push rod.2. Cam follower.3. Guide support.4. Rocker arm shaft. 5. Rocker arm.6. Exhaust valve. 7.Valve seat insert. 8. Intake valve. 9. Valve spring.The valves and valve system componentscontrol the flow of inlet air and exhaust gases into andout of the cylinder during engine operation.The intake and exhaust valves are opened andclosed by movement of these components; crank-shaft,camshaft, cam followers, push rods, rocker arms, andvalve springs. Rotation of the crankshaft causes rotationof the camshaft. The camshaft gear is driven by, andtimed to, a gear on the front of the crankshaft. When thecamshaft turns, the cams on the camshaft also turn andcause the cam followers to go up and down. Thismovement makes the push rods move the rocker arms.The movement of the rocker arms will make the intakeand exhaust valves in the cylinder head open and closeaccording to the firing order (injection sequence) of theengine. One valve spring for each valve helps to holdthe valves in the closed position.There is one intake and one exhaust valve foreach cylinder. The valve seat insert for the exhaustvalve can have replacement. The valve seat for theintake valve is machined in and is a part of the cylinderhead. When the seat for the intake valve has beenmachined to the limits given in the SPECIFICATIONS, itcan be bored (machined) for a valve seat insert. Thevalve guide bore is machined in and is a part of thecylinder head.2-13
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