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(888) 312-8812 Login SignupThe Cummins V-Ribbed Belt transfers power from the crankshaft to your water pump, alternator, and AC compressor with maximum efficiency. This heavy-duty serpentine belt is made from advanced EPDM rubber to resist the cracking and glazing caused by high-heat engine bays. It features a precision-ribbed profile that ensures a quiet, slip-free performance even under high accessory loads. The Cummins 3978286 is engineered to maintain consistent tension over thousands of miles without stretching. Replacing your belt at the first sign of fraying is the smartest way to prevent a roadside breakdown and protect your cooling system.
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