page 1 SIGMA Series G-Build Engine SW 20 - 15 Power range: 21.8 kW; 29.2 bhp Fixed speed: 1500 r/min Naturally aspirated heavy-duty G-Build diesel engine Special Attributes „X suitable for generating sets „X 250-hour service intervals „X continuous operation in ambient temperatures up to 50°C (122°F) „X unaided cold-start down to –2°C (28.4°F) Basic Engine Characteristics „X three cylinders „X diesel fuelled „X direct injection „X liquid cooled „X naturally aspirated Design Features and Equipment „X standard oil and fuel filters „X 12 V electric start „X anticlockwise rotation, looking on flywheel „X SAE 10” flywheel „X SAE3 flywheel housing „X radiator with fan guard „X cast-iron crankcase „X self-vent fuel system „X inline fuel injection pump „X flywheel with ring gear „X air cleaner „X low oil-pressure switch „X spin-on lubricating-oil filter „X primary/secondary fuel filter „X inlet and exhaust manifolds „X operators’ handbook „X instrumentation package Technical Data Engine family SW 20 Number of cylinders 3 Firing order (number 1 cylinder is at gear end) 1 2 3 Fuel injection Direct injection Aspiration Natural Direction of rotation, looking on flywheel Anticlockwise Nominal cylinder bore mm 91.44 in 3.60 Stroke mm 127 in 5 Total cylinder capacity litre 2.50 in3 152.4 Compression ratio 18.5:1 Rated maximum full-load speed r/min 1500 Mean piston speed m/sec 6.35 f/sec 20.8 Oil consumption Maximum 0.3% of fuel consumption