A defective oil ring should be repaired orreplaced.Should the trouble be caused by grit, dirt, orforeign matter in the bearing, the oil should berenewed. The new oil may flush out the impuritiesin the bearing surfaces sufficiently to permit con-tinued operation.If the main shaft bearing is out of line or im-properly fitted, or if the bearing or journal is notin proper condition, only temporary relief can beobtained from use of the various means suggestedabove. The most effective treatment will probablybe the operation of the main engines at low ormoderate speeds until such time as the proper ad-justments or repairs can be made.Abnormal temperatures of a bearing can belowered by slowing down the main shaft and thusdecreasing the amount of friction in the bearing.If the trouble has reached an advanced stage, itmay be necessary to stop the main shaft. In anemergency, cold water may be used on a bearingto reduce the temperature so that it will be withinsafe operating limits; it must be remembered,however, that cold water will cause contractionof the bearing. Also, care must be taken to seethat water does not contaminate the bearing oil.Once a bearing has wiped, it should be recon-ditioned. If it has wiped out slightly, it can prob-ably be scraped to a good bearing surface andrestored to service. If badly wiped or burned out,the bearing will require replacement. Inspect thejournal and remove any high spots by lapping thejournal.UNUSUAL NOISE IN REDUCTIONGEARThis information applies to diesel-driven shipsthat have main reduction gears. The action takenwill depend upon the two following conditions:1. When noise and conditions indicate thattooth failure is not probable:a. Slow the engine immediately and stopit if the noise persists.b. Check the oil discharge pressure, thetemperature of the bearing, and the operation ofoil sprays and strainers. Look for the presence ofbabbitt or other foreign matter.2. When there is a loud or roaring noise in-dicating gear tooth damage:a. Stop the engine and check the shaftimmediately.b. Lock the main shaft in accordance withEOSS/EOCC procedures or the manufacturer’sinstruction.c. Make a preliminary investigation of thegear teeth and other parts of the main reductiongear.PROPULSION SHAFT VIBRATESEXCESSIVELYWhen the propulsion shaft vibrates exces-sively, take the following actions:1. Slow the shaft. If the vibration continues,stop and lock the shaft.2. Investigate to determine the cause of thevibration. Take necessary action to correct thecause of the vibration.Frequently, the circumstances under which aship is operating should be considered when try-ing to determine the probable cause for excessivevibration. For example, if the ship is in shallowwater or close to a beach, the vibration may becaused by the propeller striking ground.ELECTRICAL CASUALTY CONTROLSince Enginemen and Electrician’s Mates areassigned duties in operating diesel-driven emer-gency generating plants on steam-driven ships,and all electrical generating plants on diesel-drivenships, they must have a general knowledge of thepurpose of electric generating plants, their opera-tion under various conditions, and the types ofcasualties that will interfere with, or disrupt, thenormal operation of an engineering plant.THE ELECTRICAL PLANTThe ship’s power and lighting plant consistsof generators, switchboards, power panels, cables,circuit breakers, and other equipment necessaryfor the generation, distribution, and control ofpower supplies to electrically driven auxiliaries,ENGINEMAN 1 & C9-10
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