﻿GET_GEVOMechL2_09_01_01_49 - STEP-BY-STEP Cont Screen
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<b>Note:</b> Engine-alternator coupling may be performed on the shop floor with the understanding that final alignment on the floor can only be accomplished with a webbing stand that allows for torquing of both ends of the torsion bars.

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Initial alignment (TIR less than 0.0005 in.) on the shop floor with the engine supported by stands and torsion bar nuts tightened may be attempted, but only after jacking the alternator enough to raise the engine off the rear engine support stands.

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Failure to support the engine weight in the same manner as if on the locomotive platform will result in alignment errors.

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Final alignment (web in compression with position C at -0.003 in.) must be obtained after the engine-alternator assembly weight is fully supported by the locomotive platform with the torsion bars fully mounted and torqued and top flange bolts properly torqued.

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<b>Caution:</b> Do not take the dial indicator web deflection measurements while the engine is cooling down from recent operation.

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The engine must be at shop temperature when the web deflection measurements are taken and engine-alternator alignment is adjusted.

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On a warm engine, over the span of less than a minute, the displayed reading on a mounted, undisturbed 0.0001-inch (0.00254-mm) resolution dial indicator will change appreciably as the crankshaft contracts with engine cooling.

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4. Drape the cloth across an oil pan to catch the indicator should it fall.

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<b>Warning: </b>Before rotating the crankshaft with the engine barring over device, always check that all personnel and tooling are safely clear of engine movement.

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5. Bar over the engine to set the cam-gear timing window-pointer to 110, setting the crankshaft to position A.

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<b>Caution: </b>If two sets of prick punch marks are noticed on the crankshaft web, use the larger set.

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The smaller set is associated with crankshaft manufacturing.

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<b>Note: </b>Only a single set of prick punch holes will be found on crankshafts with machined webs.

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6. Through the R6 crankcase inspection cover opening, mount the dial indicator in the webbing prick punch holes.

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7. With the gauge mounted, gently rock the gauge until the indicator needle no longer moves.

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8. Rotate the dial face outer ring to zero the gauge.