Russian Federation
The indication features of auxiliary diesel engines of the H21/32 HIMSEN series are considered. It has been established that the results of indexing and view of the developed indicator diagram are influenced by gas-dynamic processes occurring in the indicator channel of cylinder cover and the error that occurs due to the time delay in pressure increase during measurement. An analysis of cases was made when using ULSFO heavy fuel, intensive wear of fuel equipment parts (precision pairs of injector nozzles and plunger pairs of high-pressure fuel pumps) of auxiliary diesel engines 5H21/32 HIMSEN occurred in a short period (2-3 weeks). When using heavy fuel oil, the ignition delay period increases, and combustion process will shift to the expansion line, the maximum combustion pressure will decrease, efficiency will deteriorate, exhaust gas temperatures will in-crease, the engine will overheat and smoke. Detailed indicator diagrams and photos of spray nozzles and plung-ers with characteristic traces of corrosion and wear are presented. Due to wear and loss of density of plunger pairs and nozzle spray needles as a result of large fuel leaks, after 250-300 hours it was impossible to start and operate auxiliary diesel engines at a load of more than 30% of the nominal one
auxiliary diesel engine, cylinder head, indicator diagram, compression pressure, maximum pres-sure, technical diagnostics system
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