CH07 - CHAPTER SEVEN Camshafts and Valve Trains Objectives...

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CHAPTER SEVEN Camshafts and Valve Trains
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Objectives You should be able to: Explain the functions of the camshaft, camshaft sprockets, and timing belt or chain. Explain camshaft lobe design, including lift, duration, and overlap. Describe the difference between interference and free-wheeling engines.
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Objectives (Cont’d) Describe the functions of the valves, valve lifters, pushrods, and rocker arms. Describe the advantages of variable valve timing and the operation of a variable valve timing system. Measure timing chain/belt deflection. Inspect and service belt tensioners.
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Objectives (Cont’d) Perform valve timing operations on OHC and OHV engines. Measure camshaft warpage. Measure camshaft journals and lobes. Inspect and test mechanical and hydraulic valve lifters. Inspect pushrods and rocker arms.
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Valve Timing The timing of the valve opening is critical to engine operation. Valve timing is a function of the camshaft, which is driven by the crankshaft. For proper valve timing and engine operation, the camshaft and crankshaft must remain in the same relative position to each other; timing marks are provided to assist in proper installation.
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Valve Timing (Cont’d) Interference engine : one in which the pistons will strike the valves if valve timing is not correct Free-wheeling engine : one in which the pistons do not strike the valves if valve timing is not correct Many engines using timing belts have an automatic adjustable tensioner to maintain a constant tension on the belt throughout its life.
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Valve Train Components Camshafts Lifters or lash adjusters Pushrods Rocker arms or followers Valves Timing belt or chain Camshaft and crankshaft sprockets
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Camshafts The camshaft is used to control valve opening; it controls the rate of opening and closing, and how long the valve is open. They are usually constructed of nodular cast
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CH07 - CHAPTER SEVEN Camshafts and Valve Trains Objectives...

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