FIGURE 4-49. Bearing Shell Identification

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REPLACEMENT

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

FIGURE 4-50. Positioning Bearing Grooves

TM 55-1905-223-24-5

NOTE

The upper main bearing shells have a groove and an oil hole to

provide crankshaft lubrication. The lower main bearing shells do not.

The groove for the No. 7 shell is not in the center of the shell. The

wider part of the No. 7 shell must be installed toward the flywheel end

of the cylinder block (FIGURE 4-49) .

FIGURE 4-49. Bearing Shell Identification.

CAUTION

The cylinder block saddle and the cap mating surfaces must be clean

and dry when the bearing shells are installed. Used bearings must be

installed in their original location.

(1) Use clean Lubriplate 105 or its equivalent to lubricate the upper main bearing shell to crankshaft

journal mating surface.

(2) Install the upper main bearing shell. Use the same method that was used to remove the shell.

CAUTION

The groove for the dowel ring must be next to the dowel ring

counterbore in the cylinder block.

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