﻿GET_GEVOMechL2_09_01_01_42 - STEP-BY-STEP Cont Screen
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7. When coupling guide pins are being used:

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a. With the pins aligned to the flex plate holes, continue advancing the alternator toward the engine to align the engine dowels with the corresponding alternator top flange holes.

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<b>Note:</b> The simultaneous alignment of pins and dowels to their holes strongly depends on a level lift of the alternator.

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b. Once the pins and dowels are aligned to their holes, apply the four top flange bolts to the top flanges and then, using a ¾-inch air impact gun, tighten the four top flange bolts evenly, while alternating sides, so as to draw the pins and dowels completely through their holes until no gap exists between the rotor and the flex plate.

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8. If guide pins are not being used:

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a. When the engine dowels are aligned with the top pad holes, move the alternator close enough to apply the four top flange bolts and then, using a ¾-inch air impact gun, tighten the four top flange bolts evenly, while alternating sides, until the tips of the engine mounting pad alignment dowels have entered and are within 1/8th inch of the outside edge of the alternator top flange holes.

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<b>Note:</b> At this point, if the alternator is level, the engine should still be barrable without the rotor also turning.

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b. Bar the engine as needed until three adjacent coupling bolts can be loosely started by hand through the vent screen openings on opposite sides of the alternator.

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<b>Caution:</b> Screw the flex plate-to-alternator rotor bolts in far enough that they will not interfere with the crank speed sensor housing when the engine is barred over.

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<b>Caution:</b> When the rotor support and alignment guide pins (GPM060) are not used and the alternator is not level, the rotor yoke bolt holes often will not properly align with the flex plate bolt holes.

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9. Install the previously assembled 0.075-inch (1.905-mm) shim packs in the top left and right mounting flanges.

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10. Using a ¾-inch air impact wrench, continue to tighten the four alternator top flange mounting bolts (the inner top flange bolts first followed by the outer top flange bolts), while alternating sides, to draw the alternator tight against the engine.

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<b>Caution:</b> Threaded insert repair is allowed for a maximum of 2 of the 30 alternator rotor bolt holes so long as those 2 bolt holes are not adjacent.

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<b>Caution:</b> Do not tighten the flex plate-to-alternator rotor bolts until the alternator top flange mounting bolts have been tightened.

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Doing so may strip the rotor bolt hole threads.

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11. Tighten the previously installed coupling bolts with a 90° air ratchet.

