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Varley's reply was the standard practice: Engine revs to Dead Slow, increase the lubrication of affected cylinder to prevent seizure of the now overheated unit. When the fire has subsided (and patience must be exercised here, it could take a while) the engine can be stopped and the turning gear used right away to keep it turning (don't do that part in heavy or following seas). Open the affected scavenge space and remove any smoldering gunk, use a water spray to cool it but DO NOT use CO2 as it will crack the liner!
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