to the designated shop of the repair activity. After theshaft has been repaired, or a new one has been made, itis picked up and brought back to the ship by the ship’sforce. The pump is reassembled, inspected, and testedby the ship’s force to make sure it is operatingsatisfactorily.An important thing to remember is that the repairfacility is responsible for ensuring that its personnelrepair or manufacture this this to the manufacturer’sspecifications, performall tests required by qualityassurance (QA), and fill out properly all the requiredforms. You, however, are responsible for witnessing anytest required by QA, monitoring the status of the job atall times, and reassembling and test operating the pumpproperly. The end results will produce a reliable,operating piece of equipment.EQUIPMENT TESTSAs an EN2, you will assist in scheduling andperforming various tests on your equipment. Thepurpose of those tests is to determine how yourequipment is performing and if there are any equipmentmalfunctions. The tests are performed at various times,such as (1) before the ship goes to the shipyard foroverhaul, (2) after post deployment, (3) during a tenderavailability, or (4) as required by PMS. The tests areperformed by the ship’s force, IMA personnel, shipyardpersonnel, or an inspection team (such as a Board ofInspection and Survey [INSURV]). Detailed types ofinspections are described in COMNAVSURFLANTMaintenance Manual, COMNAVSURFLANT INST.9000.lC or COMNAVSURFPAC Ship and CraftMaintenance Manual, Volumes 1 and 2, PlannedMaintenance, COMNAVSURPAC INST. 4700.lB.Two types of inspections and tests that can be usedto “spot” impending trouble in an internal combustionengine are called trend and spectrographic analyses. Wewill now discuss and explain their importance and usein detecting problems in internal combustion engines.ENGINE TREND ANALYSISPreventive maintenance receives a great deal ofattention from everyone in the field of diesel engineoperation, since letting an engine run as long as it willrun and fixing it only after a breakdown occurs is notonly foolish, but extremely costly. On the other hand,you would be just as foolish to constantly tear down anengine just to inspect it. You should know that vital partsof an engine last longer and operate better if they are nottampered with unnecessarily. Therefore, an attemptmust be made to find a happy medium between thesetwo forms of maintenance.One way to determine the condition of an engine isby monitoring its operation. This is done by regularlyobtaining certain engine operating data and by studying,analyzing, and comparing it with previous data. Thisinformation is then reduced to a form that allengineering personnel can interpret and decide whetherthe engine needs to be overhauled or just temporarilyshut down for simple maintenance. For more detailedp r o c e d u r e s , r e f e r t o N A V S E A S 9 2 3 3 - C 3 -HBK-010/010, Diesel Engine, Over 400 BHP, TrendAnalysis HandbookSPECTROGRAPHIC ANALYSISSpectrographic analysis is a method of determiningengine or equipment wear by analyzing engine oil andhydraulic oil samples for chemicals and particles notfound in new oil or hydraulic fluid. This analysis is donein laboratories on samples provided by ships accordingto instructions given in their sampling kits.Ships must maintain accurate records of operatinghours since major overhauls, oil changes, and samplingsto provide the testing facility with the informationrequested in the sampling kit. (COMNAVSURFLANTuses the services of the Charleston Naval Shipyard, andCOMNAVSURFPAC uses intermediate maintenanceactivities (IMAs) for analyzing oil samples frommachinery employing closed lube oil/hydraulicsystems.) In addition, ships must maintain a record ofconditions found and repairs made as a result oflaboratory recommendations.When the shipyard or IMA laboratory receives theoil sample, a physical test and a spectrometric analysisare performed. The physical test consists of thefollowing actions:1. All samples are tested for fuel dilution, and areport by percent volume is provided to all concerned.1-19
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