CH09 - CHAPTER NINE Engine Seals Sealants and Gaskets...

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CHAPTER NINE Engine Seals, Sealants, and Gaskets Engine Reassembly, Sealing, and Installation
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Objectives You should be able to: Explain head gasket function and describe various head gasket designs. Describe the forces supplied to the head gasket with aluminum and cast iron heads. Describe various types of intake manifold gaskets.
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Objectives (Cont’d) Describe three valve cover gasket materials and various types of rear main bearing seals. Explain the application of room temperature vulcanizing (RTV) and anaerobic sealants. Install camshaft and balance shaft bearings in an OHV engine block. Measure camshaft end-play.
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Objectives (Cont’d) Install rear main bearing seals and measure main bearing clearance. Install the crankshaft and check end-play. Correctly install piston and connecting rod assemblies in the block. Measure connecting rod bearing oil clearance and side clearance.
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Objectives (Cont’d) Correctly install cylinder heads on OHV and OHC engines. Install valve train components, and adjust valve clearance; install timing chain/belt and set valve timing correctly. Install the engine in front wheel drive (FWD) or rear wheel drive (RWD) vehicles.
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Objectives (Cont’d) Perform proper break-in procedures and check oil pressure after starting the engine. Adjust ignition timing. Check engine for leaks during the break-in period. Perform driving procedures to complete the engine break-in.
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Gaskets, Seals and Sealants Gaskets : are used to prevent gas, coolant, oil or pressures from escaping between two stationary parts Seals : are used to prevent leakage of fluids around a rotating part Three engine gasket classifications: hard gaskets, soft gaskets, sealants
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Gaskets, Seals and Sealants (Cont’d) Cylinder head gaskets Prevent compression pressures, gases, and fluids from leaking Are located on the connection between the cylinder head and engine block The head gasket consists of a core, facing, and coating. Most have a metal fire ring surrounding the cylinder opening.
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Gaskets, Seals and Sealants (Cont’d) Intake Manifold Gaskets: Fit between the manifold and cylinder head to seal the air/fuel mixture or intake air. are designed to provide a good seal under the changing temperatures it will be subject to. Some V-type engines use a valley pan style. V-type engines also use strip seals to seal the connection between the ends of the manifold and the block.
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Gaskets, Seals and Sealants (Cont’d) Exhaust manifold gaskets: Seal the connection between the cylinder head and the exhaust manifold Valve cover gaskets: Seal the connection between the valve cover and cylinder head; the gasket is not subject to pressures, but must be able to seal hot, thinning oil.
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