CH08 - CHAPTER EIGHT The Cylinder Block Assembly Objectives...

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CHAPTER EIGHT The Cylinder Block Assembly
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Objectives You should be able to: Explain the function of the cylinder block. Describe the function of cylinder sleeves. Describe crankshaft design. Describe the functions of the main and connecting rod bearings, including oversize and undersize bearings.
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Objectives (Cont’d) Explain the purposes of the harmonic balancer and the flywheel. Explain piston purpose and design, including piston heat control methods. Describe the role of the piston pins and connecting rods. Explain piston ring design and purpose.
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Objectives (Cont’d) Perform a cylinder block inspection. Perform cylinder block measurements including deck warpage, cylinder bore, and main bearing alignment. Inspect crankshaft and measure warpage; measure crankshaft journals. Inspect, clean, and measure pistons.
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Objectives (Cont’d) Inspect and measure piston pins. Measure connecting rods for small and large bore diameter, bend, and twist. Recondition cylinder bores and connecting rods. Install various types of piston pins. Perform piston ring measurements and install piston rings.
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Cylinder Blocks Make up the lower section of the engine and support many of the other engine components. House the cylinders, where combustion of the air/fuel mixture takes place. Is normally a one-piece casting and may be cast from iron or aluminum.
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Cylinder Blocks (Cont’d) Some manufacturers have designed two- piece blocks utilizing a bedplate or a one- piece main bearing cap assembly. The two-piece design provides a stronger lower end, because it ties all of the main caps together to improve block stiffness and reduce engine vibration.
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Cylinder Blocks (Cont’d) Lubrication and Cooling A cylinder block contains a series of oil passages that allows engine oil to be pumped through the block and crankshaft, and on to the cylinder. The oil lubricates, cools, seals, and cleans engine components.
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Cylinder Blocks (Cont’d) Core plugs: All cast cylinder blocks use core plugs (also called expansion plugs). Cylinder sleeves: Some engines, such as those made with aluminum, have cylinder sleeves (also called a liner). Two types: wet and dry
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Crankshaft Is generally constructed from cast iron, nodular iron, or forged steel. As the pistons are forced downward on the power stroke, pressure is applied to the crankshaft, causing it to rotate. Crankshaft transmits torque to the drivetrain and, ultimately, to the drive wheels.
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Crankshaft journals: Main bearing journals are machined along the centerline of the crankshaft and support the weight and forces applied to the crankshaft. Connecting
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This note was uploaded on 09/13/2011 for the course AUTOMOTIVE 181 taught by Professor Saxton during the Spring '11 term at Community College of Philadelphia.

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CH08 - CHAPTER EIGHT The Cylinder Block Assembly Objectives...

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