FIGURE 4-46. Vibration Damper Wobble Measurement.

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FIGURE 4-45. Vibration Damper Eccentricity Measurement.

TM-55-1905-223-24-1 Main Propulsion Engine for Landing Craft Utility (LCU) NSN 1905-01-154-1191 Manual

Repair Crankshaft Assembly and Sleeve Bearings.

TM 55-1905-223-24-1

NOTE

When dial indicator is not positioned 0.50 inch (13. mm) from

the outside diameter, a new specification must be

determined. To determine the new specification, measure the

distance from the center of the crankshaft to the point the

indicator tip touches the damper. Multiply distance by

0.0025 inch (0.064 mm) to obtain maximum total indicator

runout (TIR) specification.

(5) Turn the crankshaft 360 degrees and record the total indicator runout. Verify wobble does not

exceed 0.023 inch (0.58 mm).

(6) If the measurement is not within specifications, check for foreign matter between crankshaft, adapter

and damper. If it is still not within specification, remove and inspect the damper.

j. Reinstall damper shield, paragraph 3-21.

FIGURE 4-46. Vibration Damper Wobble Measurement.

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