FIGURE 4-45. Vibration Damper Eccentricity Measurement.

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FIGURE 4-44. Tightening Sequence for Crankshaft Adapter.

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

FIGURE 4-46. Vibration Damper Wobble Measurement.

TM 55-1905-223-24-1

FIGURE 4-45. Vibration Damper Eccentricity Measurement.

NOTE

When adjusting the dial indicator, the indicator tip must

not touch the valve and injector adjustment marks.

(1) Mount a dial indicator (1, FIG. 4-45) to the gear cover; position the indicator pointer on a machined

surface of the outer member one-half inch back from the face of the damper (2).

(2) Rotate the engine crankshaft 360 degrees and record the total indicator runout. Verify eccentricity

does not exceed 0.020 inch (0.51 mm).

(3) If the measurement is not within specifications, ensure that the roll pin is installed correctly. If it is

still not within specifications, remove and inspect the damper.

NOTE

The crankshaft end clearance must be pushed or pulled in the

same direction each time a measurement is taken during

wobble measurement.

(4) Move the dial indicator (1) 0.50 inch (13.0 mm) from the outside diameter (FIG. 4-46).

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