﻿GET_GEVOMechL2_09_01_01_55 - STEP-BY-STEP Screen
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Typical steps to perform if unable to achieve a TIR of less than 0.0005 inches (0.0127 mm) even after many attempts are as follows:

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1. Verify that the engine is at room temperature when taking the web deflection measurement as a cooling engine prevents accurate indicator readings.

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2. Verify that the torsion bar nuts are correctly torqued and have not been disturbed during the alignment process.

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<b>Note:</b> There are no separate deflection tolerances for new or used combinations of engines and alternators.

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3. Verify that the correct point of reference is made regarding the flange where shims are applied.

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<b>Note:</b> The shim adjustment formulas referencing left correspond to the engine left or locomotive right alternator top mounting flange, and the formulas referencing right correspond to the engine right or locomotive left alternator top mounting flange.

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4. Verify that a calibrated 0 - 1-inch (0 - 25-mm) micrometer is being used to measure the shim thickness, not a blade-type caliper.

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5. Verify each shim thickness when adjusting the total shim pack thickness and never assume to know a shim’s thickness.

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6. Verify that used shim packs or wrinkled shims are not being used.

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7. Verify that the shim pack is being built with the thickest shim against the engine and the thinnest shims sandwiched between thicker shims.

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8. Verify that the shims are being measured individually and added together for the total shim pack thickness.

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<b>Note:</b> Never decide the pack thickness based on an overall measurement of the shim pack thickness.
