Chapter 2—ADMINISTRATION, SUPERVISION, AND TRAININGIt is important to make careful inspections andtests of equipment and items of machinery thatmay cause difficulties during full power opera-tion, since it is possible that unknown defects orconditions may go undetected during operationat fractional powers—the normal operating con-dition of the ship most of the time.Before a trial run is made, the main enginesshould be inspected to make sure that the poweroutput of the individual cylinders is equal; thisensures a balanced, smooth-operating engine, atmaximum speed and power. Equal load distribu-tion between the individual cylinders depends onthe following factors being as nearly equal aspossible for all cylinders.1. Compression pressures.2. Fuel injection timing.3. Quantity and quality of fuel injected.4. Firing pressures.5. Inlet valve timing and lift.6. Exhaust valve timing and lift.7. Exhaust gas temperatures.A common practice among many com-manding officers, when making full power trials,is first to bring the ship up to a speed of one ormore knots below the trial run speed of the shipand then turn the control of the speed (except incases of emergency nature) over to the engineerofficer. The control engineroom, under the super-vision of the engineer officer, brings the speed upslowly, depending upon the conditions of theplant, until the specified speed has been reached.2-53
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