﻿GET_GEVOMechL2_09_01_01_51 - STEP-BY-STEP Cont Screen
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<b>Caution: </b>Precision is critical in measuring the shims that are either removed or added.

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Carefully keep track of the work by documenting gauge readings, TIR and shim adjustments.

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<b>Caution: </b>Accurate reading of an outside diameter mechanical micrometer is critical in the alignment process.

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For instance, 0.100 inches (2.54 mm) is four complete turns of the adjustment handle.

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Each graduation line on the stationary scale is 0.025 inches (0.635 mm). 

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Each graduation line on the rotating scale is 0.001 inches (0.0254 mm).

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<b>Note: </b>Precision measurements will reduce the number of times the shim pack needs adjusting to achieve TIR less than 0.0005 inches (0.0127 mm).  

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Measurement errors as small as 0.001 inches (0.0254 mm) slow the alignment process.

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12. If the formulas require that shims be added, prepare to do so by using a 0 - 1-inch outside diameter micrometer, not a blade caliper, to measure and identify individual shims that add up to the thickness calculated by the formula.

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<b>Note:</b> Minimize the risk around accidentally installing shims in the wrong top flange by staging them near the corresponding top left or right flange.

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13. Without disturbing the bottom flange torsion bar nuts, use an air impact wrench to evenly loosen the four top flange mounting bolts.

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14. Use a jack bolt at either one of the top ear flanges to slightly pry the alternator away from the engine far enough to remove the shim pack.

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15. Remove the shim packs with a spare thick shim or a piece of bent wire.

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<b>Caution:</b> Never assume to know a shim’s thickness.

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Verify each shim thickness when adjusting total shim pack thickness.

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Measure the shims individually and add together for a total shim pack thickness. 

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Never decide pack thickness based on an overall measurement of shim pack thickness.

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16. Remove or add shims from or to the pack to adjust the thickness in accordance with the shim adjustment formulas.

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<b>Note:</b> When making adjustments, adhere to the following shim pack rules: 

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For each top mounting flange, do not exceed 0.135 inches (3.429 mm) in shim pack thickness.

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The difference between the top left and right flange shim pack thickness must be less than 0.060 inches (1.524 mm).

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Never reuse shim packs or install wrinkled shims.

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Build the shim pack with the thickest shim against the engine and the thinnest shims sandwiched between thicker shims.