﻿GET_GEVOMechL2_09_01_01_57 - STEP-BY-STEP Cont Screen
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17. Verify at position A that the dial indicator is being rocked until the needle stops moving and that this is being done with each new set of readings.

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18. While rotating the crankshaft between the reading positions, identify a defective dial indicator by watching the needle for momentary, rapid spinning, which is possible even if the issue cannot be replicated and observed when manipulating the indicator by hand.

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19. Verify that the full weight of the alternator is on the conical mounts or the alternator is lifted off the jack stands (floor web stand).

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20. Confirm that the conical mounts meet the 4-mm clearance requirement and are not bottomed out either against the elastomer on the top side or against the platform on the bottom side.

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21. On Tier 2 engines, inspect the low-pressure fuel line support brackets for interference with the alternator frame.

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<b>Note:</b> Bracket fouling prevents proper torque between the engine and alternator (loose shims) and creates difficulty achieving alignment and/or alignment drift after operation.

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If interference is suspected, disassemble the bracket from the hoses, rotate the bracket 180°, re-assemble the bracket and hoses, and torque the M12 and M8 bolts.

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22. Uncouple the engine from the alternator and check for raised metal or burrs on the mounting faces and coupling fit.

9
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<b>Caution: </b>Because of torsion and stress that may be introduced to the engine coupling flex plate, adjustment of bottom flange shim thickness is not permitted for alignment purposes. 

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The EVO flex plate coupling design only allows for 0.090 ± 0.001 inch (2.286 ± 0.0254 mm) bottom flange shims.

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23. Remove and verify with a 0 - 1-inch (0 - 25-mm) micrometer that the bottom left and right shim thicknesses are 0.090 inches (2.286 mm). 

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<b>Note:</b> Shim thickness can vary greatly. 

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Mismatches in bottom shim thicknesses have been known to create difficulty achieving the less than 0.0005 inches (0.0127 mm) TIR specification.  

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The left and right bottom shims being of the same thickness is more important than the actual thickness.

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If unequal shim thicknesses are found, use the top flange shims to build up the smaller-thickness bottom shim to equal the larger shim thickness.

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24. Rotate the alternator rotor by 180° and try setting the alignment from the beginning.