The Cummins flywheel 3973519 for engine 4B3.9 6B5.9 6C8.3 QSB6.7 QSF3.8 QSL9 ISB4.5 is an industrial replacement part from Cummins. It fills a specific mechanical or electrical role within the system it's installed in. It is commonly in a range of industrial and manufacturing applications.
