IN ANSWERING QUESTION 4–17, REFER TOFIGURE 4A.4–17.The digits in the firing order ofan engine are the cylinder numbers.If the firing order of the engineof figure 4A is 1–4–2–3, in whichorder do the cylinders fire?1.A, B, C, D2.A, c, B, D3.A, D, B, C4.A, D, C, B4–18.How does the camshaft actuate theintake and exhaust valves of anL–head engine?1.By tappets from a positionabove the valves2.By tappets from a positionbelow the valves3.By tappets, pushrods, androcker arms from a positionabove the valves4.By tappets, pushrods, androcker arms from a positionbelow the valves4–19.Which of the following is NOTconsidered to be a stationary partof an engine?1.The piston assembly2.The cylinder block3.The crankcase4.The cylinder head4-20.Cylinder sleeves for the blocks ofgasoline and diesel engines areused for which of the followingpurposes?1.To decrease the wear of thecylinder blocks2.10 strengthen the cylinderblocks3.To help enclose the heat in thecylinder blocks4.To help make a seal to containthe oil within the cylinderblocks4–21.The curved surface of the pocketsin which the valves of an L–headcylinder head function are designedfor which of the followingpurposes?1.To shorten the compressionstroke2.To lengthen the compressionstroke3.To decrease the turbulence ofthe air–fuel mixture4.To increase the turbulence ofthe air–fuel mixture4–22.Which of the following componentssupports and encloses thecrankshaft and provides a reservoirfor the lubricating oil?1.The cylinder head2.The exhaust manifold3.The intake manifold4.The crankcase4-23.The waste products of combustionare carried from the cylindersthrough which of the followingmeans?1.The intake manifold2.The exhaust manifold3.The cylinder head4.The cylinder block35
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