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 TM 55-1905-223-24-5
SECTION V. UNIT MAINTENANCE PROCEDURES
2-20. General. This section contains unit maintenance information for the NT 855 M Bowthruster Diesel
Engine. Step-by-step actions are provided with illustrations when applicable.
a. Equipment Condition
WARNING
Clearly display a tag marked "Out of Service" on the ship's electrical service circuit breaker
panel to prevent accidental re-energizing of the circuits that could result in injury or death.
(1) While performing maintenance on the Bowthruster Engine place a tag marked "Out of Service" on
the ship's electrical service circuit breaker panel.
(2) When removing components from the engine, ensure that openings are capped/plugged/covered to
prevent foreign matter or contamination from entering the engine.
(3) Exercise caution when working with engine or component gasket surfaces.
(4) Clean engine and components with authorized solvents, acids, and solutions only.
(5) Use only authorized tools while working on the engine or engine components.
(6) Use proper safety equipment when required.
b. Work Area
(1) Maintain clean environment for engine or engine component work areas. Contamination will cause
premature wear.
(2) Use caution when working with solvents and acids.
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