﻿GET_GEVOMechL2_09_01_01_58 - STEP-BY-STEP Cont Screen
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25. If excessive vibration is detected after starting, evaluate the problem as follows:

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a. Use a dial indicator to confirm that the alternator alignment is within specification.

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<b>Note:</b> For EVO engine-alternators, the in-service condemning limits for web compression are the same as the initial compression limits.

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There is no in-service allowance separate from the initial web compression specification of -0.003 inches (-0.0762 mm). 

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b. Check for the excessive rabbet-fit clearance between the rotor flange and the engine flex plate.

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c. Check the clearance on all conical mount buffer studs.

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<b>Note:</b> TIR is the difference between the maximum and minimum readings.

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A TIR over 0.008 inches (0.203 mm) indicates a problem with the assembly or a quality issue with the parts.

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The cause must be found and corrected.

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d. After the rotor yoke-to-flex plate bolts are fully torqued, measure the runout of the outer diameter of the rotor yoke flange as the engine is barred over 360°.

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<b>Note:</b> The TIR should be 0.008 inches (0.203 mm) or less.

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e. Measure the vibration in Notch 8 Self-Load and, if the vibration is greater than the upper limits, uncouple the alternator from the engine, bar the engine crankshaft by 180°, recouple and re-align the alternator and the engine, and then re-measure the Notch 8 Self-Load vibration.

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f. Lower the #7 main bearing cap and inspect for bearing failure.
