Several Detroit Diesel engines have unique couplings which connect the heads on each side of the engine, a male-to-male threaded variable length couplingwhich lengthen when their ends are threaded into the heads. Following a fire aboard a passenger vessel the US Coastguard has issued a safety alert warning againstreplacing the couplings with ones which are not designed for use with the engines.
Recently, a fire occurred on a passenger vessel operating about a mile offshore in the Atlantic Ocean. A crewmember, while making a round in a machinery space, noticed that a small fuel spray fire had developed above one of the four propulsion engines. The crewmember vacated the space and informed the bridge watch. Subsequently, proper emergency procedures were followed, ventilation to the machinery space was secured, and the CO2 via the fixed fire fighting system was released. Fortunately for the 174 persons onboard, the fire was quickly extinguished without incident or additional complications. Although the investigation is not complete, USCG has issued an alert.