FIGURE 4-47. Front Counterweight Markings

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FIGURE 4-46. Measuring Crankshaft Bore

TM-55-1905-223-24-5 Bowthruster Engine for Landing Craft Utility (LCU) NSN 1905-01-154-1191 Manual

FIGURE 4-48. Rear Counterweight Markings

TM 55-1905-223-24-5

c. Inspect crankshaft:

(1) Check the crankshaft for wear, cracks, and other damage.

(2) Using micrometer, measure each journal of the crankshaft in three places and take the average of

those three measurements.

(3) Grind the crankshaft journals if they are out-of-round more than 0.002 inch (0.05 mm) (or replace the

crankshaft) (See Table 4-9 for minimum and maximum diameters.) Follow the instructions provided-

with the grinding equipment.

FIGURE 4-47. Front Counterweight Markings.

Table 4-9. Crankshaft Journal Diameters

Minimum

Maximum

Worn Limit

Journal

Inch (mm)

Connecting Rod

3.1235

3.125

3.122

(79.337)

(79.375)

(79.298)

Main Bearing

4.4985

4.500

4.4975

(114.262)

(114.30)

(114.237)

4-89