Description: Flywheel For Cummins 6B5.9 / B5.9, B4.5 / B6.7, ISB 5.9 / ISB 6.7, ISC / C8.3
Condition: New
Brand: Cummins®
Part Number: 3943728
Fits For
- Cummins 6B5.9 / B5.9
- B4.5 / B6.7
- ISB 5.9 / ISB 6.7
- ISC / C8.3
- Various QSB engines
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A flywheel is a large, heavy metal disc that is connected to the engine’s crankshaft. Its main purpose is to store and maintain rotational energy, helping the engine run smoothly and consistently.
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Stores rotational energy to keep the engine turning smoothly.
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Reduces engine vibrations and helps maintain consistent engine speed.
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Transfers engine power to the transmission through the clutch.
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Helps start the engine because the starter motor turns the flywheel.
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Provides a mounting surface for the clutch in manual-transmission vehicles.
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Signs of Faulty:
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Vibrations or shaking when the engine is running, especially when releasing the clutch.
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Clutch slipping — the engine RPM rises, but the vehicle doesn't accelerate normally.
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Grinding or unusual noises when starting or stopping the engine.
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Difficulty shifting gears, especially in a manual transmission.
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Clutch chatter — the vehicle shakes or jerks when taking off.
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Hard starting if the flywheel’s starter-ring gear is damaged.
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Burning smell from excessive clutch slipping.
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Visible cracks, hot spots, or uneven surfaces if the flywheel is inspected.
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Cummins® is a worldwide leader in the production of engines, agricultural components, and other power-generating devices for various industries, including medium and heavy duty trucks, light commercial vehicles, buses, agriculture, and construction. Founded in 1919, this company stays true to its mission of making people's lives better by continuously improving its product line-up and introducing new solutions for a more prosperous world. Its core values—integrity, diversity and inclusion, excellence, caring, and teamwork—are what make it a successful company today—a worldwide leader with a network of more than 600 company-owned and independent distributors and almost 6,000 dealers in approximately 190 countries.
