﻿GET_GEVOMechL2_09_01_01_47 - ANIMATION Screen
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The alternator alignment to the engine is sometimes called setting the web deflection because it involves adjusting the flexure of the crankshaft webbing.

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This flexure or bending of the crankshaft reflects how well or poorly the alternator is aligned to the engine and is measured by the total travel of a dial indicator needle as the crankshaft is rotated.

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The total needle travel is called Total Indicated Runout (TIR).

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As the crankshaft rotates, when the distance between the two crankshaft webs decreases as measured by a dial indicator mounted between the webs, the webbing is described as in compression.

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When the distance increases, the webbing is described as having spread.

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When the total movement of the indicator needle sums to less than 0.0005 inches (0.0127 mm), the webbing is described as having a TIR of less than 0.0005 inches (0.0127 mm).

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EVO alternator alignment is a two-step process.

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Shims are first added and removed from the top mounting flanges as needed to achieve a web TIR of less than 0.0005 inches (0.0127 mm).

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The next step is to reduce pressure on the engine #7 main bearing.

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The web is placed in compression by inserting 0.015-inch (0.381-mm) shims in both top left and right mounting flanges.

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This step is done after all bending has been removed, i.e. the TIR is less than 0.0005 inches (0.0127 mm).

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Once the 0.015-inch (0.381-mm) shims are inserted, the web compression will be indicated by a direct gauge reading at position C of negative 0.003 inches (0.076 mm).

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<b>Caution:</b> Do not skip setting of TIR to zero, before setting C to -0.003 inches (-0.076 mm).

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All crankshaft web runout or wobble needs to be verified as having been removed before putting the web in compression at position C by the insertion of 0.015-inch (0.381-mm) shims.
