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 TM 55-1905-220-14-10
5-5. MARINE GEAR MAINTENANCE INSTRUCTIONS (Continued).
LOCATION
ITEM
ACTION
REMARKS
ADJUSTMENT IN CRAFT (Cont)
NOTE (Cont)
(5) Some boats are not structurally rigid and some carry their load in such a way that
they will "hog" or go out of normal shape with every loading and unloading. Where this
condition exists, it may be necessary to make a compromise between the top and
bottom coupling clearance by leaving a greater clearance at the bottom of the marine
gear output flange and propeller coupling. This clearance might be 0.005 to 0.007 inch
(0.013 to 0.018 cm) while the top would maintain the standard 0.002 inch (0.005 cm).
(6) During the process of securing final alignment, it may be necessary to shift the
engine many times. When the final alignment is secured, the necessary steel or
hardwood shims are made up and the engine and gear is fastened in place. The
alignment is then rechecked, and if satisfactory, the coupling is bolted together.
(7) When a heavy boat is dry-docked, it naturally undergoes some bending. Therefore,
it is always good practice to unbolt the marine gear coupling and prevent bending of
the shaft.
OVERHAUL IN CRAFT
NOTE
Due to the unique design of the Marine Gear, it is possible to service the forward and
reverse clutches without disconnecting the gear from the engine or propeller shaft
companion flange. With this feature, it is unnecessary to disturb the alignment of the
gear, or to accomplish the time-consuming operation of removing the gear from the
installation. Other serviceable parts while the gear is installed are the selector valve
assembly, the oil pump assembly, the oil filter, and the oil strainer. Also, it is possible
to service the propeller flange oil seals by disconnecting the propeller shaft companion
flange and moving the shaft rearward approximately 3-1/2 inches.
5-148
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