Trouble shooting table 14 Fuel consumption too high D Constant full-load operation D Speed resistance owing to incrustation of hull, shaft system and propeller with foreign matter D Poor efficiency of the drive system D Fuel quality does not satisfy regulations D Fuel leaks in the system D High power requirements by additional units (hydraulic pumps, compressors etc) D Delivery start set incorrectly D Injection pump set incorrectly or defec- tive D Valve clearance incorrect D Intake vacuum / exhaust backpressure too high D Injection nozzles worn D Adjust propeller D See ”Fuels, Lubricants ...” D Remedy by Bosch Service Black smoke D Lack of combustion air, intake vacuum too high D Engine speed reduction owing to the propeller’s taking up too much power D Sudden full load after long low load or idling periods D Air filter contaminated D Leaks in air pipes downstream of com- pressor D Diaphragm in wastegate leaky D Intercooler leaky, defective D Unsuitable fuel D Turbocharger defective D Delivery start set incorrectly D Injection nozzles defective, coked D Injection pump set incorrectly or defective D Exhaust backpressure too high D Check intake air supply to air filters (engine room ventilation) D See ”Fuels, Lubricants ...” D Remedy by Bosch Service Blue smoke D Engine coolant/intake air still too cold D Mainly low-load operation D Piston rings worn or broken D Valve guides worn D Crankcase breather clogged (overpres- sure in crankcase)