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 TM 55-1905-219-14-10
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
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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