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REPAIR (cont) - TM-5-1940-277-34_434
CLEANING, PAINTING (cont)

TM-5-1940-277-34 Boat Bridge Erection Twin Jet Aluminum Hull Model USCSBMK1 (1940-01-105-5728) Manual
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TM 5-1940-277-34 HULL ASSEMBLY REPAIR INSTRUCTIONS (Continued) LOCATION ITEM ACTION REMARKS b. Deburr the edges. c. Cut a patch of the same material as the hull and size as the hole. d. Cut another rectangular plate whose length and width exceed that of patch plate by at least 4 in. e. Center the patch plate on the larger plate. f. Drill a row of holes (size depends on rivet diameter) approximately 1 in from the edge of the patch plate and through both plates (spacing must be not less than 3 times the rivet diameter or more than 24 times the thickness of both plates). g. Rivet the two plates together. h. Position the prepared patch in the hole in the hull with the oversize plate on the inside of the hull. i. Drill a row of holes approximately 1 in in from the edge of the backing (oversize) plate through the backing plate and hull plate (spacing as in step f). j. Remove the prepared patch and coat the area of the backing plate that contacts the hull plate with a waterproof sealant. k. Position the patch and rivet in place. NOTE If there is a question about the fit of the patch the seam could be closed by a light weld. CLEANING, PAINTING 1. NOTE The surface must be prepared before painting can be undertaken.  The primary preparation consists of a thorough cleaning.  Degreasing is not sufficient. 2-427







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