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TermDefinition
diesel engine an internal combustion engine in which the heat required for ignition of the fuel is generated by the compression of the air used for combustion; also known as compression ignition engine; the simpler types are two-stroke engine and four-stroke engine
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TermDefinition
air compressor compressor to provide compressed air for general use, control air system and diesel engine's starting air system
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air cooler heat exchanger used to cool down the charging air coming from turbocharger before being admitted into diesel engine for combustion
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auxiliary engine engine other than for propulsion purpose; usually refers to electrical power generating diesel engine
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brake horsepower the power available at the shaft of an engine after minusing the frictional losses in the running component of the engine but before passing through reduction gears or other transmission devices; for direct-connected diesel engine, this power is same as shaft horsepower; this is measured using a brake which gives the name; bhp for short
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connecting rod a rod connecting lower end of piston rod with crank pin of a reciprocating diesel engine
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crankshaft shaft that supports reciprocating pistons while rotating in bearings as in a diesel engine; consists of journals, crank webs and crankpins
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critical speed of diesel engine, the rotating speed at which the resonant condition occurs, i.e. the engine-generated frequency coincides with any one of the natural frequencies of the engine shafting system creating higher stresses
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fuel valve a valve which injects highly pressurised fuel oil into the cylinder of a diesel engine for combustion; also known as fuel injector
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gudgeon pin horizontal pin by means of which a piston is attached freely to a connecting rod in a diesel engine
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high speed engine refer to diesel engine operating with rotational speed above 1000 rpm
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impingement describes a condition during injection, whereby excessive velocity of fuel spray causes fuel to contact diesel engine's piston crown and liner with possible localised burning
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jacket outer casing enveloping a diesel engine's cylinder or pipe to form an annular space; for the cylinder, the annular space is used for circulating cooling water; in the case of pipe, it may function as a protective casing to contain high pressure leakage from pipe rupture
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low speed engine refer to diesel engine operating with rotational speed below 150 rpm
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main engine generally refers to the propulsion diesel engine that propels a ship
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medium speed engine refer to diesel engine operating with rotational speed between 300 to 1000 rpm
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motor tanker refers to any self-propelled tanker, i.e. tanker fitted with diesel engine for propulsion; commonly abbreviated as MT
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motor vessel refers to any self-propelled vessel, i.e. vessel fitted with diesel engine for propulsion; commonly abbreviated as MV
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oil mist detector safety device for detecting dangerous accumulation of oil mist in diesel engine crankcase; the oil mist may be a result of hot spot arising in the bearings; the heat generated from the hot spot may cause the lubricating oil to evaporate into gaseous particles and also act as an ignition source for the oil mist to explode under certain conducive conditions; the resulting explosion is known as crankcase explosion
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opposed piston engine internal combustion diesel engine having two pistons moving in opposite direction in each cylinder; suction, compression, expansion and exhaust occurs between the two pistons
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piston of diesel engine, a cylindrical metallic block with a few grooves cut around the circumference at the top edge; acting together with the piston rings in the grooves, it serves to seal the compressed intake air and combustion gases in the cylinder above it and transmit the expanding gas forces downward to turn the engine via the connecting rod
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piston crown upper section of a two-piece piston; the upper surface facing the combustion space is either concave or convex which is self-supporting, i.e. rigid enough to withstand the repetitive combustion forces without giving way; the piston is usually made in two sections for diesel engine with higher power output

see piston skirt
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piston skirt lower section of a two-piece piston; the piston is usually made in two sections for diesel engine with higher power output

see piston crown
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purifier a rotating machinery for separating two liquids of different specific gravity or solids from liquid by the use of centrifugal force; the mixture is rotated at several thousand revolutions per minute within a bowl and the heavier the fluids or solids the further away from the centre of rotation achieving separation; usually used to purify fuel oil or lubricating oil for diesel engine use; also known as centrifugal separator

compare clarifier
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side kick an informal term referring to the connecting rod of a diesel engine flying out of its normal running locus due to some mechanical failure and damaging the engine casing, crankcase cover or door
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sump well for collecting oil; generally refers to the oil reservoir in the bottom of crankcase of a diesel engine; also known as sump tank
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thermal efficiency of an engine, is the ratio of work done by the engine to the available heat energy in the fuel consumed; for steam reciprocating engines, this may range from 11 to 13.5 per cent while diesel engines from 35 to 41.5 per cent, according to whether waste heat boilers are used
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thermistor an electrical, temperature-sensing device made of solid semi-conductor materials; it has negative temperature coefficient of resistance, i.e. the resistance falls as the temperature rises, and the change in resistance is large for a small change in temperature; applications onboard include temperature measurement of bearing, stern tube and diesel engine
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torsionmeter an instrument for indicating the torque transmitted by a shaft; this is done by measuring the angle of twist over a calibrated length of shaft; this finding is used to calculate the shaft horsepower of a diesel engine
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turbocharger centrifugal air compressor driven by turbine powered by exhaust gases from the diesel engine; it supplies compressed air at higher pressure to the engine so that more fuel can be burnt to increase engine power
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waste heat heat that would be lost to atmosphere or otherwise wasted if not recovered; sources of waste heat on board a ship include exhaust gases, jacket outlet cooling water of diesel engine, etc.
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