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Chapter34MeasuringFasteners

Chapter34MeasuringFasteners - Measuring tools Modern...

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Measuring tools Modern engines use thinner casting and require more precise measuring Selectively fit engines All parts are measured and marked according to size Then selectively assembled for optimum clearance Copyright 2003 Gary Lewis - Dave Capitolo
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Tolerance limits The minimum and maximum allowable diameters Specified clearance Difference in diameters for mating parts Specified clearance of replacement part should be used
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Example of tolerance limits for crankshaft and housing bore Standard shaft size 1.9995/2.0005 in. Housing bore diameter 2.1245/2.1250 in. Clearances Difference between shaft OD and bearing ID Minimums and maximums
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Maximum bearing inside diameter Maximum housing bore +2.1250 in. Bearing thickness -.0615 in. Bearing thickness -.0615 in. Max bearing inside diameter 2.0020 in. Minimum bearing inside diameter Minimum housing bore +2.1245 in. Bearing thickness -.0615 in. Bearing thickness -.0615 in. Min bearing inside diameter 2.0015 in.
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Minimum bearing clearance Minimum bearing ID +2.0015 in. Maximum crankshaft diameter - 2.0005 in. Minimum bearing clearance .001 in. Maximum bearing clearance Maximum bearing ID +2.0020 in. Minimum crankshaft diameter - 1.9995 in. Maximum bearing clearance .0025 in.
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To find valve guide diameter Minimum clearance .0015 in.
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